/* * Copyright (C) 2014 Red Hat * Copyright (C) 2014 Intel Corp. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: * Rob Clark <robdclark@gmail.com> * Daniel Vetter <daniel.vetter@ffwll.ch> */ #include <drm/drmP.h> #include <drm/drm_atomic.h> #include <drm/drm_plane_helper.h> #include <drm/drm_crtc_helper.h> #include <drm/drm_atomic_helper.h> #include <linux/dma-fence.h> #include "drm_crtc_internal.h" /** * DOC: overview * * This helper library provides implementations of check and commit functions on * top of the CRTC modeset helper callbacks and the plane helper callbacks. It * also provides convenience implementations for the atomic state handling * callbacks for drivers which don't need to subclass the drm core structures to * add their own additional internal state. * * This library also provides default implementations for the check callback in * drm_atomic_helper_check() and for the commit callback with * drm_atomic_helper_commit(). But the individual stages and callbacks are * exposed to allow drivers to mix and match and e.g. use the plane helpers only * together with a driver private modeset implementation. * * This library also provides implementations for all the legacy driver * interfaces on top of the atomic interface. See drm_atomic_helper_set_config(), * drm_atomic_helper_disable_plane(), drm_atomic_helper_disable_plane() and the * various functions to implement set_property callbacks. New drivers must not * implement these functions themselves but must use the provided helpers. * * The atomic helper uses the same function table structures as all other * modesetting helpers. See the documentation for struct &drm_crtc_helper_funcs, * struct &drm_encoder_helper_funcs and struct &drm_connector_helper_funcs. It * also shares the struct &drm_plane_helper_funcs function table with the plane * helpers. */ static void drm_atomic_helper_plane_changed(struct drm_atomic_state *state, struct drm_plane_state *plane_state, struct drm_plane *plane) { struct drm_crtc_state *crtc_state; if (plane->state->crtc) { crtc_state = drm_atomic_get_existing_crtc_state(state, plane->state->crtc); if (WARN_ON(!crtc_state)) return; crtc_state->planes_changed = true; } if (plane_state->crtc) { crtc_state = drm_atomic_get_existing_crtc_state(state, plane_state->crtc); if (WARN_ON(!crtc_state)) return; crtc_state->planes_changed = true; } } static int handle_conflicting_encoders(struct drm_atomic_state *state, bool disable_conflicting_encoders) { struct drm_connector_state *conn_state; struct drm_connector *connector; struct drm_encoder *encoder; unsigned encoder_mask = 0; int i, ret; /* * First loop, find all newly assigned encoders from the connectors * part of the state. If the same encoder is assigned to multiple * connectors bail out. */ for_each_connector_in_state(state, connector, conn_state, i) { const struct drm_connector_helper_funcs *funcs = connector->helper_private; struct drm_encoder *new_encoder; if (!conn_state->crtc) continue; if (funcs->atomic_best_encoder) new_encoder = funcs->atomic_best_encoder(connector, conn_state); else if (funcs->best_encoder) new_encoder = funcs->best_encoder(connector); else new_encoder = drm_atomic_helper_best_encoder(connector); if (new_encoder) { if (encoder_mask & (1 << drm_encoder_index(new_encoder))) { DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] on [CONNECTOR:%d:%s] already assigned\n", new_encoder->base.id, new_encoder->name, connector->base.id, connector->name); return -EINVAL; } encoder_mask |= 1 << drm_encoder_index(new_encoder); } } if (!encoder_mask) return 0; /* * Second loop, iterate over all connectors not part of the state. * * If a conflicting encoder is found and disable_conflicting_encoders * is not set, an error is returned. Userspace can provide a solution * through the atomic ioctl. * * If the flag is set conflicting connectors are removed from the crtc * and the crtc is disabled if no encoder is left. This preserves * compatibility with the legacy set_config behavior. */ drm_for_each_connector(connector, state->dev) { struct drm_crtc_state *crtc_state; if (drm_atomic_get_existing_connector_state(state, connector)) continue; encoder = connector->state->best_encoder; if (!encoder || !(encoder_mask & (1 << drm_encoder_index(encoder)))) continue; if (!disable_conflicting_encoders) { DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s] by [CONNECTOR:%d:%s]\n", encoder->base.id, encoder->name, connector->state->crtc->base.id, connector->state->crtc->name, connector->base.id, connector->name); return -EINVAL; } conn_state = drm_atomic_get_connector_state(state, connector); if (IS_ERR(conn_state)) return PTR_ERR(conn_state); DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], disabling [CONNECTOR:%d:%s]\n", encoder->base.id, encoder->name, conn_state->crtc->base.id, conn_state->crtc->name, connector->base.id, connector->name); crtc_state = drm_atomic_get_existing_crtc_state(state, conn_state->crtc); ret = drm_atomic_set_crtc_for_connector(conn_state, NULL); if (ret) return ret; if (!crtc_state->connector_mask) { ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, NULL); if (ret < 0) return ret; crtc_state->active = false; } } return 0; } static void set_best_encoder(struct drm_atomic_state *state, struct drm_connector_state *conn_state, struct drm_encoder *encoder) { struct drm_crtc_state *crtc_state; struct drm_crtc *crtc; if (conn_state->best_encoder) { /* Unset the encoder_mask in the old crtc state. */ crtc = conn_state->connector->state->crtc; /* A NULL crtc is an error here because we should have * duplicated a NULL best_encoder when crtc was NULL. * As an exception restoring duplicated atomic state * during resume is allowed, so don't warn when * best_encoder is equal to encoder we intend to set. */ WARN_ON(!crtc && encoder != conn_state->best_encoder); if (crtc) { crtc_state = drm_atomic_get_existing_crtc_state(state, crtc); crtc_state->encoder_mask &= ~(1 << drm_encoder_index(conn_state->best_encoder)); } } if (encoder) { crtc = conn_state->crtc; WARN_ON(!crtc); if (crtc) { crtc_state = drm_atomic_get_existing_crtc_state(state, crtc); crtc_state->encoder_mask |= 1 << drm_encoder_index(encoder); } } conn_state->best_encoder = encoder; } static void steal_encoder(struct drm_atomic_state *state, struct drm_encoder *encoder) { struct drm_crtc_state *crtc_state; struct drm_connector *connector; struct drm_connector_state *connector_state; int i; for_each_connector_in_state(state, connector, connector_state, i) { struct drm_crtc *encoder_crtc; if (connector_state->best_encoder != encoder) continue; encoder_crtc = connector->state->crtc; DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] in use on [CRTC:%d:%s], stealing it\n", encoder->base.id, encoder->name, encoder_crtc->base.id, encoder_crtc->name); set_best_encoder(state, connector_state, NULL); crtc_state = drm_atomic_get_existing_crtc_state(state, encoder_crtc); crtc_state->connectors_changed = true; return; } } static int update_connector_routing(struct drm_atomic_state *state, struct drm_connector *connector, struct drm_connector_state *connector_state) { const struct drm_connector_helper_funcs *funcs; struct drm_encoder *new_encoder; struct drm_crtc_state *crtc_state; DRM_DEBUG_ATOMIC("Updating routing for [CONNECTOR:%d:%s]\n", connector->base.id, connector->name); if (connector->state->crtc != connector_state->crtc) { if (connector->state->crtc) { crtc_state = drm_atomic_get_existing_crtc_state(state, connector->state->crtc); crtc_state->connectors_changed = true; } if (connector_state->crtc) { crtc_state = drm_atomic_get_existing_crtc_state(state, connector_state->crtc); crtc_state->connectors_changed = true; } } if (!connector_state->crtc) { DRM_DEBUG_ATOMIC("Disabling [CONNECTOR:%d:%s]\n", connector->base.id, connector->name); set_best_encoder(state, connector_state, NULL); return 0; } funcs = connector->helper_private; if (funcs->atomic_best_encoder) new_encoder = funcs->atomic_best_encoder(connector, connector_state); else if (funcs->best_encoder) new_encoder = funcs->best_encoder(connector); else new_encoder = drm_atomic_helper_best_encoder(connector); if (!new_encoder) { DRM_DEBUG_ATOMIC("No suitable encoder found for [CONNECTOR:%d:%s]\n", connector->base.id, connector->name); return -EINVAL; } if (!drm_encoder_crtc_ok(new_encoder, connector_state->crtc)) { DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] incompatible with [CRTC:%d]\n", new_encoder->base.id, new_encoder->name, connector_state->crtc->base.id); return -EINVAL; } if (new_encoder == connector_state->best_encoder) { set_best_encoder(state, connector_state, new_encoder); DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] keeps [ENCODER:%d:%s], now on [CRTC:%d:%s]\n", connector->base.id, connector->name, new_encoder->base.id, new_encoder->name, connector_state->crtc->base.id, connector_state->crtc->name); return 0; } steal_encoder(state, new_encoder); set_best_encoder(state, connector_state, new_encoder); crtc_state = drm_atomic_get_existing_crtc_state(state, connector_state->crtc); crtc_state->connectors_changed = true; DRM_DEBUG_ATOMIC("[CONNECTOR:%d:%s] using [ENCODER:%d:%s] on [CRTC:%d:%s]\n", connector->base.id, connector->name, new_encoder->base.id, new_encoder->name, connector_state->crtc->base.id, connector_state->crtc->name); return 0; } static int mode_fixup(struct drm_atomic_state *state) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_connector *connector; struct drm_connector_state *conn_state; int i; bool ret; for_each_crtc_in_state(state, crtc, crtc_state, i) { if (!crtc_state->mode_changed && !crtc_state->connectors_changed) continue; drm_mode_copy(&crtc_state->adjusted_mode, &crtc_state->mode); } for_each_connector_in_state(state, connector, conn_state, i) { const struct drm_encoder_helper_funcs *funcs; struct drm_encoder *encoder; WARN_ON(!!conn_state->best_encoder != !!conn_state->crtc); if (!conn_state->crtc || !conn_state->best_encoder) continue; crtc_state = drm_atomic_get_existing_crtc_state(state, conn_state->crtc); /* * Each encoder has at most one connector (since we always steal * it away), so we won't call ->mode_fixup twice. */ encoder = conn_state->best_encoder; funcs = encoder->helper_private; ret = drm_bridge_mode_fixup(encoder->bridge, &crtc_state->mode, &crtc_state->adjusted_mode); if (!ret) { DRM_DEBUG_ATOMIC("Bridge fixup failed\n"); return -EINVAL; } if (funcs && funcs->atomic_check) { ret = funcs->atomic_check(encoder, crtc_state, conn_state); if (ret) { DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] check failed\n", encoder->base.id, encoder->name); return ret; } } else if (funcs && funcs->mode_fixup) { ret = funcs->mode_fixup(encoder, &crtc_state->mode, &crtc_state->adjusted_mode); if (!ret) { DRM_DEBUG_ATOMIC("[ENCODER:%d:%s] fixup failed\n", encoder->base.id, encoder->name); return -EINVAL; } } } for_each_crtc_in_state(state, crtc, crtc_state, i) { const struct drm_crtc_helper_funcs *funcs; if (!crtc_state->enable) continue; if (!crtc_state->mode_changed && !crtc_state->connectors_changed) continue; funcs = crtc->helper_private; if (!funcs->mode_fixup) continue; ret = funcs->mode_fixup(crtc, &crtc_state->mode, &crtc_state->adjusted_mode); if (!ret) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] fixup failed\n", crtc->base.id, crtc->name); return -EINVAL; } } return 0; } /** * drm_atomic_helper_check_modeset - validate state object for modeset changes * @dev: DRM device * @state: the driver state object * * Check the state object to see if the requested state is physically possible. * This does all the crtc and connector related computations for an atomic * update and adds any additional connectors needed for full modesets and calls * down into ->mode_fixup functions of the driver backend. * * crtc_state->mode_changed is set when the input mode is changed. * crtc_state->connectors_changed is set when a connector is added or * removed from the crtc. * crtc_state->active_changed is set when crtc_state->active changes, * which is used for dpms. * See also: drm_atomic_crtc_needs_modeset() * * IMPORTANT: * * Drivers which set ->mode_changed (e.g. in their ->atomic_check hooks if a * plane update can't be done without a full modeset) _must_ call this function * afterwards after that change. It is permitted to call this function multiple * times for the same update, e.g. when the ->atomic_check functions depend upon * the adjusted dotclock for fifo space allocation and watermark computation. * * RETURNS: * Zero for success or -errno */ int drm_atomic_helper_check_modeset(struct drm_device *dev, struct drm_atomic_state *state) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_connector *connector; struct drm_connector_state *connector_state; int i, ret; for_each_crtc_in_state(state, crtc, crtc_state, i) { if (!drm_mode_equal(&crtc->state->mode, &crtc_state->mode)) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] mode changed\n", crtc->base.id, crtc->name); crtc_state->mode_changed = true; } if (crtc->state->enable != crtc_state->enable) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enable changed\n", crtc->base.id, crtc->name); /* * For clarity this assignment is done here, but * enable == 0 is only true when there are no * connectors and a NULL mode. * * The other way around is true as well. enable != 0 * iff connectors are attached and a mode is set. */ crtc_state->mode_changed = true; crtc_state->connectors_changed = true; } } ret = handle_conflicting_encoders(state, state->legacy_set_config); if (ret) return ret; for_each_connector_in_state(state, connector, connector_state, i) { /* * This only sets crtc->connectors_changed for routing changes, * drivers must set crtc->connectors_changed themselves when * connector properties need to be updated. */ ret = update_connector_routing(state, connector, connector_state); if (ret) return ret; } /* * After all the routing has been prepared we need to add in any * connector which is itself unchanged, but who's crtc changes it's * configuration. This must be done before calling mode_fixup in case a * crtc only changed its mode but has the same set of connectors. */ for_each_crtc_in_state(state, crtc, crtc_state, i) { bool has_connectors = !!crtc_state->connector_mask; /* * We must set ->active_changed after walking connectors for * otherwise an update that only changes active would result in * a full modeset because update_connector_routing force that. */ if (crtc->state->active != crtc_state->active) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] active changed\n", crtc->base.id, crtc->name); crtc_state->active_changed = true; } if (!drm_atomic_crtc_needs_modeset(crtc_state)) continue; DRM_DEBUG_ATOMIC("[CRTC:%d:%s] needs all connectors, enable: %c, active: %c\n", crtc->base.id, crtc->name, crtc_state->enable ? 'y' : 'n', crtc_state->active ? 'y' : 'n'); ret = drm_atomic_add_affected_connectors(state, crtc); if (ret != 0) return ret; ret = drm_atomic_add_affected_planes(state, crtc); if (ret != 0) return ret; if (crtc_state->enable != has_connectors) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] enabled/connectors mismatch\n", crtc->base.id, crtc->name); return -EINVAL; } } return mode_fixup(state); } EXPORT_SYMBOL(drm_atomic_helper_check_modeset); /** * drm_atomic_helper_check_planes - validate state object for planes changes * @dev: DRM device * @state: the driver state object * * Check the state object to see if the requested state is physically possible. * This does all the plane update related checks using by calling into the * ->atomic_check hooks provided by the driver. * * It also sets crtc_state->planes_changed to indicate that a crtc has * updated planes. * * RETURNS: * Zero for success or -errno */ int drm_atomic_helper_check_planes(struct drm_device *dev, struct drm_atomic_state *state) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_plane *plane; struct drm_plane_state *plane_state; int i, ret = 0; ret = drm_atomic_normalize_zpos(dev, state); if (ret) return ret; for_each_plane_in_state(state, plane, plane_state, i) { const struct drm_plane_helper_funcs *funcs; funcs = plane->helper_private; drm_atomic_helper_plane_changed(state, plane_state, plane); if (!funcs || !funcs->atomic_check) continue; ret = funcs->atomic_check(plane, plane_state); if (ret) { DRM_DEBUG_ATOMIC("[PLANE:%d:%s] atomic driver check failed\n", plane->base.id, plane->name); return ret; } } for_each_crtc_in_state(state, crtc, crtc_state, i) { const struct drm_crtc_helper_funcs *funcs; funcs = crtc->helper_private; if (!funcs || !funcs->atomic_check) continue; ret = funcs->atomic_check(crtc, crtc_state); if (ret) { DRM_DEBUG_ATOMIC("[CRTC:%d:%s] atomic driver check failed\n", crtc->base.id, crtc->name); return ret; } } return ret; } EXPORT_SYMBOL(drm_atomic_helper_check_planes); /** * drm_atomic_helper_check - validate state object * @dev: DRM device * @state: the driver state object * * Check the state object to see if the requested state is physically possible. * Only crtcs and planes have check callbacks, so for any additional (global) * checking that a driver needs it can simply wrap that around this function. * Drivers without such needs can directly use this as their ->atomic_check() * callback. * * This just wraps the two parts of the state checking for planes and modeset * state in the default order: First it calls drm_atomic_helper_check_modeset() * and then drm_atomic_helper_check_planes(). The assumption is that the * ->atomic_check functions depend upon an updated adjusted_mode.clock to * e.g. properly compute watermarks. * * RETURNS: * Zero for success or -errno */ int drm_atomic_helper_check(struct drm_device *dev, struct drm_atomic_state *state) { int ret; ret = drm_atomic_helper_check_modeset(dev, state); if (ret) return ret; ret = drm_atomic_helper_check_planes(dev, state); if (ret) return ret; return ret; } EXPORT_SYMBOL(drm_atomic_helper_check); static void disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state) { struct drm_connector *connector; struct drm_connector_state *old_conn_state; struct drm_crtc *crtc; struct drm_crtc_state *old_crtc_state; int i; for_each_connector_in_state(old_state, connector, old_conn_state, i) { const struct drm_encoder_helper_funcs *funcs; struct drm_encoder *encoder; /* Shut down everything that's in the changeset and currently * still on. So need to check the old, saved state. */ if (!old_conn_state->crtc) continue; old_crtc_state = drm_atomic_get_existing_crtc_state(old_state, old_conn_state->crtc); if (!old_crtc_state->active || !drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state)) continue; encoder = old_conn_state->best_encoder; /* We shouldn't get this far if we didn't previously have * an encoder.. but WARN_ON() rather than explode. */ if (WARN_ON(!encoder)) continue; funcs = encoder->helper_private; DRM_DEBUG_ATOMIC("disabling [ENCODER:%d:%s]\n", encoder->base.id, encoder->name); /* * Each encoder has at most one connector (since we always steal * it away), so we won't call disable hooks twice. */ drm_bridge_disable(encoder->bridge); /* Right function depends upon target state. */ if (funcs) { if (connector->state->crtc && funcs->prepare) funcs->prepare(encoder); else if (funcs->disable) funcs->disable(encoder); else if (funcs->dpms) funcs->dpms(encoder, DRM_MODE_DPMS_OFF); } drm_bridge_post_disable(encoder->bridge); } for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { const struct drm_crtc_helper_funcs *funcs; /* Shut down everything that needs a full modeset. */ if (!drm_atomic_crtc_needs_modeset(crtc->state)) continue; if (!old_crtc_state->active) continue; funcs = crtc->helper_private; DRM_DEBUG_ATOMIC("disabling [CRTC:%d:%s]\n", crtc->base.id, crtc->name); /* Right function depends upon target state. */ if (crtc->state->enable && funcs->prepare) funcs->prepare(crtc); else if (funcs->atomic_disable) funcs->atomic_disable(crtc, old_crtc_state); else if (funcs->disable) funcs->disable(crtc); else funcs->dpms(crtc, DRM_MODE_DPMS_OFF); } } /** * drm_atomic_helper_update_legacy_modeset_state - update legacy modeset state * @dev: DRM device * @old_state: atomic state object with old state structures * * This function updates all the various legacy modeset state pointers in * connectors, encoders and crtcs. It also updates the timestamping constants * used for precise vblank timestamps by calling * drm_calc_timestamping_constants(). * * Drivers can use this for building their own atomic commit if they don't have * a pure helper-based modeset implementation. */ void drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev, struct drm_atomic_state *old_state) { struct drm_connector *connector; struct drm_connector_state *old_conn_state; struct drm_crtc *crtc; struct drm_crtc_state *old_crtc_state; int i; /* clear out existing links and update dpms */ for_each_connector_in_state(old_state, connector, old_conn_state, i) { if (connector->encoder) { WARN_ON(!connector->encoder->crtc); connector->encoder->crtc = NULL; connector->encoder = NULL; } crtc = connector->state->crtc; if ((!crtc && old_conn_state->crtc) || (crtc && drm_atomic_crtc_needs_modeset(crtc->state))) { struct drm_property *dpms_prop = dev->mode_config.dpms_property; int mode = DRM_MODE_DPMS_OFF; if (crtc && crtc->state->active) mode = DRM_MODE_DPMS_ON; connector->dpms = mode; drm_object_property_set_value(&connector->base, dpms_prop, mode); } } /* set new links */ for_each_connector_in_state(old_state, connector, old_conn_state, i) { if (!connector->state->crtc) continue; if (WARN_ON(!connector->state->best_encoder)) continue; connector->encoder = connector->state->best_encoder; connector->encoder->crtc = connector->state->crtc; } /* set legacy state in the crtc structure */ for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { struct drm_plane *primary = crtc->primary; crtc->mode = crtc->state->mode; crtc->enabled = crtc->state->enable; if (drm_atomic_get_existing_plane_state(old_state, primary) && primary->state->crtc == crtc) { crtc->x = primary->state->src_x >> 16; crtc->y = primary->state->src_y >> 16; } if (crtc->state->enable) drm_calc_timestamping_constants(crtc, &crtc->state->adjusted_mode); } } EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state); static void crtc_set_mode(struct drm_device *dev, struct drm_atomic_state *old_state) { struct drm_crtc *crtc; struct drm_crtc_state *old_crtc_state; struct drm_connector *connector; struct drm_connector_state *old_conn_state; int i; for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { const struct drm_crtc_helper_funcs *funcs; if (!crtc->state->mode_changed) continue; funcs = crtc->helper_private; if (crtc->state->enable && funcs->mode_set_nofb) { DRM_DEBUG_ATOMIC("modeset on [CRTC:%d:%s]\n", crtc->base.id, crtc->name); funcs->mode_set_nofb(crtc); } } for_each_connector_in_state(old_state, connector, old_conn_state, i) { const struct drm_encoder_helper_funcs *funcs; struct drm_crtc_state *new_crtc_state; struct drm_encoder *encoder; struct drm_display_mode *mode, *adjusted_mode; if (!connector->state->best_encoder) continue; encoder = connector->state->best_encoder; funcs = encoder->helper_private; new_crtc_state = connector->state->crtc->state; mode = &new_crtc_state->mode; adjusted_mode = &new_crtc_state->adjusted_mode; if (!new_crtc_state->mode_changed) continue; DRM_DEBUG_ATOMIC("modeset on [ENCODER:%d:%s]\n", encoder->base.id, encoder->name); /* * Each encoder has at most one connector (since we always steal * it away), so we won't call mode_set hooks twice. */ if (funcs && funcs->atomic_mode_set) { funcs->atomic_mode_set(encoder, new_crtc_state, connector->state); } else if (funcs && funcs->mode_set) { funcs->mode_set(encoder, mode, adjusted_mode); } drm_bridge_mode_set(encoder->bridge, mode, adjusted_mode); } } /** * drm_atomic_helper_commit_modeset_disables - modeset commit to disable outputs * @dev: DRM device * @old_state: atomic state object with old state structures * * This function shuts down all the outputs that need to be shut down and * prepares them (if required) with the new mode. * * For compatibility with legacy crtc helpers this should be called before * drm_atomic_helper_commit_planes(), which is what the default commit function * does. But drivers with different needs can group the modeset commits together * and do the plane commits at the end. This is useful for drivers doing runtime * PM since planes updates then only happen when the CRTC is actually enabled. */ void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev, struct drm_atomic_state *old_state) { disable_outputs(dev, old_state); drm_atomic_helper_update_legacy_modeset_state(dev, old_state); crtc_set_mode(dev, old_state); } EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_disables); /** * drm_atomic_helper_commit_modeset_enables - modeset commit to enable outputs * @dev: DRM device * @old_state: atomic state object with old state structures * * This function enables all the outputs with the new configuration which had to * be turned off for the update. * * For compatibility with legacy crtc helpers this should be called after * drm_atomic_helper_commit_planes(), which is what the default commit function * does. But drivers with different needs can group the modeset commits together * and do the plane commits at the end. This is useful for drivers doing runtime * PM since planes updates then only happen when the CRTC is actually enabled. */ void drm_atomic_helper_commit_modeset_enables(struct drm_device *dev, struct drm_atomic_state *old_state) { struct drm_crtc *crtc; struct drm_crtc_state *old_crtc_state; struct drm_connector *connector; struct drm_connector_state *old_conn_state; int i; for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { const struct drm_crtc_helper_funcs *funcs; /* Need to filter out CRTCs where only planes change. */ if (!drm_atomic_crtc_needs_modeset(crtc->state)) continue; if (!crtc->state->active) continue; funcs = crtc->helper_private; if (crtc->state->enable) { DRM_DEBUG_ATOMIC("enabling [CRTC:%d:%s]\n", crtc->base.id, crtc->name); if (funcs->enable) funcs->enable(crtc); else funcs->commit(crtc); } } for_each_connector_in_state(old_state, connector, old_conn_state, i) { const struct drm_encoder_helper_funcs *funcs; struct drm_encoder *encoder; if (!connector->state->best_encoder) continue; if (!connector->state->crtc->state->active || !drm_atomic_crtc_needs_modeset(connector->state->crtc->state)) continue; encoder = connector->state->best_encoder; funcs = encoder->helper_private; DRM_DEBUG_ATOMIC("enabling [ENCODER:%d:%s]\n", encoder->base.id, encoder->name); /* * Each encoder has at most one connector (since we always steal * it away), so we won't call enable hooks twice. */ drm_bridge_pre_enable(encoder->bridge); if (funcs) { if (funcs->enable) funcs->enable(encoder); else if (funcs->commit) funcs->commit(encoder); } drm_bridge_enable(encoder->bridge); } } EXPORT_SYMBOL(drm_atomic_helper_commit_modeset_enables); /** * drm_atomic_helper_wait_for_fences - wait for fences stashed in plane state * @dev: DRM device * @state: atomic state object with old state structures * @pre_swap: if true, do an interruptible wait * * For implicit sync, driver should fish the exclusive fence out from the * incoming fb's and stash it in the drm_plane_state. This is called after * drm_atomic_helper_swap_state() so it uses the current plane state (and * just uses the atomic state to find the changed planes) * * Returns zero if success or < 0 if dma_fence_wait() fails. */ int drm_atomic_helper_wait_for_fences(struct drm_device *dev, struct drm_atomic_state *state, bool pre_swap) { struct drm_plane *plane; struct drm_plane_state *plane_state; int i, ret; for_each_plane_in_state(state, plane, plane_state, i) { if (!pre_swap) plane_state = plane->state; if (!plane_state->fence) continue; WARN_ON(!plane_state->fb); /* * If waiting for fences pre-swap (ie: nonblock), userspace can * still interrupt the operation. Instead of blocking until the * timer expires, make the wait interruptible. */ ret = dma_fence_wait(plane_state->fence, pre_swap); if (ret) return ret; dma_fence_put(plane_state->fence); plane_state->fence = NULL; } return 0; } EXPORT_SYMBOL(drm_atomic_helper_wait_for_fences); /** * drm_atomic_helper_framebuffer_changed - check if framebuffer has changed * @dev: DRM device * @old_state: atomic state object with old state structures * @crtc: DRM crtc * * Checks whether the framebuffer used for this CRTC changes as a result of * the atomic update. This is useful for drivers which cannot use * drm_atomic_helper_wait_for_vblanks() and need to reimplement its * functionality. * * Returns: * true if the framebuffer changed. */ bool drm_atomic_helper_framebuffer_changed(struct drm_device *dev, struct drm_atomic_state *old_state, struct drm_crtc *crtc) { struct drm_plane *plane; struct drm_plane_state *old_plane_state; int i; for_each_plane_in_state(old_state, plane, old_plane_state, i) { if (plane->state->crtc != crtc && old_plane_state->crtc != crtc) continue; if (plane->state->fb != old_plane_state->fb) return true; } return false; } EXPORT_SYMBOL(drm_atomic_helper_framebuffer_changed); /** * drm_atomic_helper_wait_for_vblanks - wait for vblank on crtcs * @dev: DRM device * @old_state: atomic state object with old state structures * * Helper to, after atomic commit, wait for vblanks on all effected * crtcs (ie. before cleaning up old framebuffers using * drm_atomic_helper_cleanup_planes()). It will only wait on crtcs where the * framebuffers have actually changed to optimize for the legacy cursor and * plane update use-case. */ void drm_atomic_helper_wait_for_vblanks(struct drm_device *dev, struct drm_atomic_state *old_state) { struct drm_crtc *crtc; struct drm_crtc_state *old_crtc_state; int i, ret; for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { /* No one cares about the old state, so abuse it for tracking * and store whether we hold a vblank reference (and should do a * vblank wait) in the ->enable boolean. */ old_crtc_state->enable = false; if (!crtc->state->enable) continue; /* Legacy cursor ioctls are completely unsynced, and userspace * relies on that (by doing tons of cursor updates). */ if (old_state->legacy_cursor_update) continue; if (!drm_atomic_helper_framebuffer_changed(dev, old_state, crtc)) continue; ret = drm_crtc_vblank_get(crtc); if (ret != 0) continue; old_crtc_state->enable = true; old_crtc_state->last_vblank_count = drm_crtc_vblank_count(crtc); } for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { if (!old_crtc_state->enable) continue; ret = wait_event_timeout(dev->vblank[i].queue, old_crtc_state->last_vblank_count != drm_crtc_vblank_count(crtc), msecs_to_jiffies(50)); WARN(!ret, "[CRTC:%d] vblank wait timed out\n", crtc->base.id); drm_crtc_vblank_put(crtc); } } EXPORT_SYMBOL(drm_atomic_helper_wait_for_vblanks); /** * drm_atomic_helper_commit_tail - commit atomic update to hardware * @state: new modeset state to be committed * * This is the default implemenation for the ->atomic_commit_tail() hook of the * &drm_mode_config_helper_funcs vtable. * * Note that the default ordering of how the various stages are called is to * match the legacy modeset helper library closest. One peculiarity of that is * that it doesn't mesh well with runtime PM at all. * * For drivers supporting runtime PM the recommended sequence is instead :: * * drm_atomic_helper_commit_modeset_disables(dev, state); * * drm_atomic_helper_commit_modeset_enables(dev, state); * * drm_atomic_helper_commit_planes(dev, state, * DRM_PLANE_COMMIT_ACTIVE_ONLY); * * for committing the atomic update to hardware. See the kerneldoc entries for * these three functions for more details. */ void drm_atomic_helper_commit_tail(struct drm_atomic_state *state) { struct drm_device *dev = state->dev; drm_atomic_helper_commit_modeset_disables(dev, state); drm_atomic_helper_commit_planes(dev, state, 0); drm_atomic_helper_commit_modeset_enables(dev, state); drm_atomic_helper_commit_hw_done(state); drm_atomic_helper_wait_for_vblanks(dev, state); drm_atomic_helper_cleanup_planes(dev, state); } EXPORT_SYMBOL(drm_atomic_helper_commit_tail); static void commit_tail(struct drm_atomic_state *state) { struct drm_device *dev = state->dev; struct drm_mode_config_helper_funcs *funcs; funcs = dev->mode_config.helper_private; drm_atomic_helper_wait_for_fences(dev, state, false); drm_atomic_helper_wait_for_dependencies(state); if (funcs && funcs->atomic_commit_tail) funcs->atomic_commit_tail(state); else drm_atomic_helper_commit_tail(state); drm_atomic_helper_commit_cleanup_done(state); drm_atomic_state_put(state); } static void commit_work(struct work_struct *work) { struct drm_atomic_state *state = container_of(work, struct drm_atomic_state, commit_work); commit_tail(state); } /** * drm_atomic_helper_commit - commit validated state object * @dev: DRM device * @state: the driver state object * @nonblock: whether nonblocking behavior is requested. * * This function commits a with drm_atomic_helper_check() pre-validated state * object. This can still fail when e.g. the framebuffer reservation fails. This * function implements nonblocking commits, using * drm_atomic_helper_setup_commit() and related functions. * * Note that right now this function does not support nonblocking commits, hence * driver writers must implement their own version for now. * * Committing the actual hardware state is done through the * ->atomic_commit_tail() callback of the &drm_mode_config_helper_funcs vtable, * or it's default implementation drm_atomic_helper_commit_tail(). * * RETURNS: * Zero for success or -errno. */ int drm_atomic_helper_commit(struct drm_device *dev, struct drm_atomic_state *state, bool nonblock) { int ret; ret = drm_atomic_helper_setup_commit(state, nonblock); if (ret) return ret; INIT_WORK(&state->commit_work, commit_work); ret = drm_atomic_helper_prepare_planes(dev, state); if (ret) return ret; if (!nonblock) { ret = drm_atomic_helper_wait_for_fences(dev, state, true); if (ret) return ret; } /* * This is the point of no return - everything below never fails except * when the hw goes bonghits. Which means we can commit the new state on * the software side now. */ drm_atomic_helper_swap_state(state, true); /* * Everything below can be run asynchronously without the need to grab * any modeset locks at all under one condition: It must be guaranteed * that the asynchronous work has either been cancelled (if the driver * supports it, which at least requires that the framebuffers get * cleaned up with drm_atomic_helper_cleanup_planes()) or completed * before the new state gets committed on the software side with * drm_atomic_helper_swap_state(). * * This scheme allows new atomic state updates to be prepared and * checked in parallel to the asynchronous completion of the previous * update. Which is important since compositors need to figure out the * composition of the next frame right after having submitted the * current layout. * * NOTE: Commit work has multiple phases, first hardware commit, then * cleanup. We want them to overlap, hence need system_unbound_wq to * make sure work items don't artifically stall on each another. */ drm_atomic_state_get(state); if (nonblock) queue_work(system_unbound_wq, &state->commit_work); else commit_tail(state); return 0; } EXPORT_SYMBOL(drm_atomic_helper_commit); /** * DOC: implementing nonblocking commit * * Nonblocking atomic commits have to be implemented in the following sequence: * * 1. Run drm_atomic_helper_prepare_planes() first. This is the only function * which commit needs to call which can fail, so we want to run it first and * synchronously. * * 2. Synchronize with any outstanding nonblocking commit worker threads which * might be affected the new state update. This can be done by either cancelling * or flushing the work items, depending upon whether the driver can deal with * cancelled updates. Note that it is important to ensure that the framebuffer * cleanup is still done when cancelling. * * Asynchronous workers need to have sufficient parallelism to be able to run * different atomic commits on different CRTCs in parallel. The simplest way to * achive this is by running them on the &system_unbound_wq work queue. Note * that drivers are not required to split up atomic commits and run an * individual commit in parallel - userspace is supposed to do that if it cares. * But it might be beneficial to do that for modesets, since those necessarily * must be done as one global operation, and enabling or disabling a CRTC can * take a long time. But even that is not required. * * 3. The software state is updated synchronously with * drm_atomic_helper_swap_state(). Doing this under the protection of all modeset * locks means concurrent callers never see inconsistent state. And doing this * while it's guaranteed that no relevant nonblocking worker runs means that * nonblocking workers do not need grab any locks. Actually they must not grab * locks, for otherwise the work flushing will deadlock. * * 4. Schedule a work item to do all subsequent steps, using the split-out * commit helpers: a) pre-plane commit b) plane commit c) post-plane commit and * then cleaning up the framebuffers after the old framebuffer is no longer * being displayed. * * The above scheme is implemented in the atomic helper libraries in * drm_atomic_helper_commit() using a bunch of helper functions. See * drm_atomic_helper_setup_commit() for a starting point. */ static int stall_checks(struct drm_crtc *crtc, bool nonblock) { struct drm_crtc_commit *commit, *stall_commit = NULL; bool completed = true; int i; long ret = 0; spin_lock(&crtc->commit_lock); i = 0; list_for_each_entry(commit, &crtc->commit_list, commit_entry) { if (i == 0) { completed = try_wait_for_completion(&commit->flip_done); /* Userspace is not allowed to get ahead of the previous * commit with nonblocking ones. */ if (!completed && nonblock) { spin_unlock(&crtc->commit_lock); return -EBUSY; } } else if (i == 1) { stall_commit = commit; drm_crtc_commit_get(stall_commit); break; } i++; } spin_unlock(&crtc->commit_lock); if (!stall_commit) return 0; /* We don't want to let commits get ahead of cleanup work too much, * stalling on 2nd previous commit means triple-buffer won't ever stall. */ ret = wait_for_completion_interruptible_timeout(&stall_commit->cleanup_done, 10*HZ); if (ret == 0) DRM_ERROR("[CRTC:%d:%s] cleanup_done timed out\n", crtc->base.id, crtc->name); drm_crtc_commit_put(stall_commit); return ret < 0 ? ret : 0; } /** * drm_atomic_helper_setup_commit - setup possibly nonblocking commit * @state: new modeset state to be committed * @nonblock: whether nonblocking behavior is requested. * * This function prepares @state to be used by the atomic helper's support for * nonblocking commits. Drivers using the nonblocking commit infrastructure * should always call this function from their ->atomic_commit hook. * * To be able to use this support drivers need to use a few more helper * functions. drm_atomic_helper_wait_for_dependencies() must be called before * actually committing the hardware state, and for nonblocking commits this call * must be placed in the async worker. See also drm_atomic_helper_swap_state() * and it's stall parameter, for when a driver's commit hooks look at the * ->state pointers of struct &drm_crtc, &drm_plane or &drm_connector directly. * * Completion of the hardware commit step must be signalled using * drm_atomic_helper_commit_hw_done(). After this step the driver is not allowed * to read or change any permanent software or hardware modeset state. The only * exception is state protected by other means than &drm_modeset_lock locks. * Only the free standing @state with pointers to the old state structures can * be inspected, e.g. to clean up old buffers using * drm_atomic_helper_cleanup_planes(). * * At the very end, before cleaning up @state drivers must call * drm_atomic_helper_commit_cleanup_done(). * * This is all implemented by in drm_atomic_helper_commit(), giving drivers a * complete and esay-to-use default implementation of the atomic_commit() hook. * * The tracking of asynchronously executed and still pending commits is done * using the core structure &drm_crtc_commit. * * By default there's no need to clean up resources allocated by this function * explicitly: drm_atomic_state_default_clear() will take care of that * automatically. * * Returns: * * 0 on success. -EBUSY when userspace schedules nonblocking commits too fast, * -ENOMEM on allocation failures and -EINTR when a signal is pending. */ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state, bool nonblock) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_crtc_commit *commit; int i, ret; for_each_crtc_in_state(state, crtc, crtc_state, i) { commit = kzalloc(sizeof(*commit), GFP_KERNEL); if (!commit) return -ENOMEM; init_completion(&commit->flip_done); init_completion(&commit->hw_done); init_completion(&commit->cleanup_done); INIT_LIST_HEAD(&commit->commit_entry); kref_init(&commit->ref); commit->crtc = crtc; state->crtcs[i].commit = commit; ret = stall_checks(crtc, nonblock); if (ret) return ret; /* Drivers only send out events when at least either current or * new CRTC state is active. Complete right away if everything * stays off. */ if (!crtc->state->active && !crtc_state->active) { complete_all(&commit->flip_done); continue; } /* Legacy cursor updates are fully unsynced. */ if (state->legacy_cursor_update) { complete_all(&commit->flip_done); continue; } if (!crtc_state->event) { commit->event = kzalloc(sizeof(*commit->event), GFP_KERNEL); if (!commit->event) return -ENOMEM; crtc_state->event = commit->event; } crtc_state->event->base.completion = &commit->flip_done; } return 0; } EXPORT_SYMBOL(drm_atomic_helper_setup_commit); static struct drm_crtc_commit *preceeding_commit(struct drm_crtc *crtc) { struct drm_crtc_commit *commit; int i = 0; list_for_each_entry(commit, &crtc->commit_list, commit_entry) { /* skip the first entry, that's the current commit */ if (i == 1) return commit; i++; } return NULL; } /** * drm_atomic_helper_wait_for_dependencies - wait for required preceeding commits * @state: new modeset state to be committed * * This function waits for all preceeding commits that touch the same CRTC as * @state to both be committed to the hardware (as signalled by * drm_atomic_helper_commit_hw_done) and executed by the hardware (as signalled * by calling drm_crtc_vblank_send_event on the event member of * &drm_crtc_state). * * This is part of the atomic helper support for nonblocking commits, see * drm_atomic_helper_setup_commit() for an overview. */ void drm_atomic_helper_wait_for_dependencies(struct drm_atomic_state *state) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_crtc_commit *commit; int i; long ret; for_each_crtc_in_state(state, crtc, crtc_state, i) { spin_lock(&crtc->commit_lock); commit = preceeding_commit(crtc); if (commit) drm_crtc_commit_get(commit); spin_unlock(&crtc->commit_lock); if (!commit) continue; ret = wait_for_completion_timeout(&commit->hw_done, 10*HZ); if (ret == 0) DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n", crtc->base.id, crtc->name); /* Currently no support for overwriting flips, hence * stall for previous one to execute completely. */ ret = wait_for_completion_timeout(&commit->flip_done, 10*HZ); if (ret == 0) DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n", crtc->base.id, crtc->name); drm_crtc_commit_put(commit); } } EXPORT_SYMBOL(drm_atomic_helper_wait_for_dependencies); /** * drm_atomic_helper_commit_hw_done - setup possible nonblocking commit * @state: new modeset state to be committed * * This function is used to signal completion of the hardware commit step. After * this step the driver is not allowed to read or change any permanent software * or hardware modeset state. The only exception is state protected by other * means than &drm_modeset_lock locks. * * Drivers should try to postpone any expensive or delayed cleanup work after * this function is called. * * This is part of the atomic helper support for nonblocking commits, see * drm_atomic_helper_setup_commit() for an overview. */ void drm_atomic_helper_commit_hw_done(struct drm_atomic_state *state) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_crtc_commit *commit; int i; for_each_crtc_in_state(state, crtc, crtc_state, i) { commit = state->crtcs[i].commit; if (!commit) continue; /* backend must have consumed any event by now */ WARN_ON(crtc->state->event); spin_lock(&crtc->commit_lock); complete_all(&commit->hw_done); spin_unlock(&crtc->commit_lock); } } EXPORT_SYMBOL(drm_atomic_helper_commit_hw_done); /** * drm_atomic_helper_commit_cleanup_done - signal completion of commit * @state: new modeset state to be committed * * This signals completion of the atomic update @state, including any cleanup * work. If used, it must be called right before calling * drm_atomic_state_put(). * * This is part of the atomic helper support for nonblocking commits, see * drm_atomic_helper_setup_commit() for an overview. */ void drm_atomic_helper_commit_cleanup_done(struct drm_atomic_state *state) { struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_crtc_commit *commit; int i; long ret; for_each_crtc_in_state(state, crtc, crtc_state, i) { commit = state->crtcs[i].commit; if (WARN_ON(!commit)) continue; spin_lock(&crtc->commit_lock); complete_all(&commit->cleanup_done); WARN_ON(!try_wait_for_completion(&commit->hw_done)); /* commit_list borrows our reference, need to remove before we * clean up our drm_atomic_state. But only after it actually * completed, otherwise subsequent commits won't stall properly. */ if (try_wait_for_completion(&commit->flip_done)) goto del_commit; spin_unlock(&crtc->commit_lock); /* We must wait for the vblank event to signal our completion * before releasing our reference, since the vblank work does * not hold a reference of its own. */ ret = wait_for_completion_timeout(&commit->flip_done, 10*HZ); if (ret == 0) DRM_ERROR("[CRTC:%d:%s] flip_done timed out\n", crtc->base.id, crtc->name); spin_lock(&crtc->commit_lock); del_commit: list_del(&commit->commit_entry); spin_unlock(&crtc->commit_lock); } } EXPORT_SYMBOL(drm_atomic_helper_commit_cleanup_done); /** * drm_atomic_helper_prepare_planes - prepare plane resources before commit * @dev: DRM device * @state: atomic state object with new state structures * * This function prepares plane state, specifically framebuffers, for the new * configuration. If any failure is encountered this function will call * ->cleanup_fb on any already successfully prepared framebuffer. * * Returns: * 0 on success, negative error code on failure. */ int drm_atomic_helper_prepare_planes(struct drm_device *dev, struct drm_atomic_state *state) { struct drm_plane *plane; struct drm_plane_state *plane_state; int ret, i, j; for_each_plane_in_state(state, plane, plane_state, i) { const struct drm_plane_helper_funcs *funcs; funcs = plane->helper_private; if (!drm_atomic_helper_framebuffer_changed(dev, state, plane_state->crtc)) continue; if (funcs->prepare_fb) { ret = funcs->prepare_fb(plane, plane_state); if (ret) goto fail; } } return 0; fail: for_each_plane_in_state(state, plane, plane_state, j) { const struct drm_plane_helper_funcs *funcs; if (j >= i) continue; if (!drm_atomic_helper_framebuffer_changed(dev, state, plane_state->crtc)) continue; funcs = plane->helper_private; if (funcs->cleanup_fb) funcs->cleanup_fb(plane, plane_state); } return ret; } EXPORT_SYMBOL(drm_atomic_helper_prepare_planes); static bool plane_crtc_active(const struct drm_plane_state *state) { return state->crtc && state->crtc->state->active; } /** * drm_atomic_helper_commit_planes - commit plane state * @dev: DRM device * @old_state: atomic state object with old state structures * @flags: flags for committing plane state * * This function commits the new plane state using the plane and atomic helper * functions for planes and crtcs. It assumes that the atomic state has already * been pushed into the relevant object state pointers, since this step can no * longer fail. * * It still requires the global state object @old_state to know which planes and * crtcs need to be updated though. * * Note that this function does all plane updates across all CRTCs in one step. * If the hardware can't support this approach look at * drm_atomic_helper_commit_planes_on_crtc() instead. * * Plane parameters can be updated by applications while the associated CRTC is * disabled. The DRM/KMS core will store the parameters in the plane state, * which will be available to the driver when the CRTC is turned on. As a result * most drivers don't need to be immediately notified of plane updates for a * disabled CRTC. * * Unless otherwise needed, drivers are advised to set the ACTIVE_ONLY flag in * @flags in order not to receive plane update notifications related to a * disabled CRTC. This avoids the need to manually ignore plane updates in * driver code when the driver and/or hardware can't or just don't need to deal * with updates on disabled CRTCs, for example when supporting runtime PM. * * Drivers may set the NO_DISABLE_AFTER_MODESET flag in @flags if the relevant * display controllers require to disable a CRTC's planes when the CRTC is * disabled. This function would skip the ->atomic_disable call for a plane if * the CRTC of the old plane state needs a modesetting operation. Of course, * the drivers need to disable the planes in their CRTC disable callbacks * since no one else would do that. * * The drm_atomic_helper_commit() default implementation doesn't set the * ACTIVE_ONLY flag to most closely match the behaviour of the legacy helpers. * This should not be copied blindly by drivers. */ void drm_atomic_helper_commit_planes(struct drm_device *dev, struct drm_atomic_state *old_state, uint32_t flags) { struct drm_crtc *crtc; struct drm_crtc_state *old_crtc_state; struct drm_plane *plane; struct drm_plane_state *old_plane_state; int i; bool active_only = flags & DRM_PLANE_COMMIT_ACTIVE_ONLY; bool no_disable = flags & DRM_PLANE_COMMIT_NO_DISABLE_AFTER_MODESET; for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { const struct drm_crtc_helper_funcs *funcs; funcs = crtc->helper_private; if (!funcs || !funcs->atomic_begin) continue; if (active_only && !crtc->state->active) continue; funcs->atomic_begin(crtc, old_crtc_state); } for_each_plane_in_state(old_state, plane, old_plane_state, i) { const struct drm_plane_helper_funcs *funcs; bool disabling; funcs = plane->helper_private; if (!funcs) continue; disabling = drm_atomic_plane_disabling(plane, old_plane_state); if (active_only) { /* * Skip planes related to inactive CRTCs. If the plane * is enabled use the state of the current CRTC. If the * plane is being disabled use the state of the old * CRTC to avoid skipping planes being disabled on an * active CRTC. */ if (!disabling && !plane_crtc_active(plane->state)) continue; if (disabling && !plane_crtc_active(old_plane_state)) continue; } /* * Special-case disabling the plane if drivers support it. */ if (disabling && funcs->atomic_disable) { struct drm_crtc_state *crtc_state; crtc_state = old_plane_state->crtc->state; if (drm_atomic_crtc_needs_modeset(crtc_state) && no_disable) continue; funcs->atomic_disable(plane, old_plane_state); } else if (plane->state->crtc || disabling) { funcs->atomic_update(plane, old_plane_state); } } for_each_crtc_in_state(old_state, crtc, old_crtc_state, i) { const struct drm_crtc_helper_funcs *funcs; funcs = crtc->helper_private; if (!funcs || !funcs->atomic_flush) continue; if (active_only && !crtc->state->active) continue; funcs->atomic_flush(crtc, old_crtc_state); } } EXPORT_SYMBOL(drm_atomic_helper_commit_planes); /** * drm_atomic_helper_commit_planes_on_crtc - commit plane state for a crtc * @old_crtc_state: atomic state object with the old crtc state * * This function commits the new plane state using the plane and atomic helper * functions for planes on the specific crtc. It assumes that the atomic state * has already been pushed into the relevant object state pointers, since this * step can no longer fail. * * This function is useful when plane updates should be done crtc-by-crtc * instead of one global step like drm_atomic_helper_commit_planes() does. * * This function can only be savely used when planes are not allowed to move * between different CRTCs because this function doesn't handle inter-CRTC * depencies. Callers need to ensure that either no such depencies exist, * resolve them through ordering of commit calls or through some other means. */ void drm_atomic_helper_commit_planes_on_crtc(struct drm_crtc_state *old_crtc_state) { const struct drm_crtc_helper_funcs *crtc_funcs; struct drm_crtc *crtc = old_crtc_state->crtc; struct drm_atomic_state *old_state = old_crtc_state->state; struct drm_plane *plane; unsigned plane_mask; plane_mask = old_crtc_state->plane_mask; plane_mask |= crtc->state->plane_mask; crtc_funcs = crtc->helper_private; if (crtc_funcs && crtc_funcs->atomic_begin) crtc_funcs->atomic_begin(crtc, old_crtc_state); drm_for_each_plane_mask(plane, crtc->dev, plane_mask) { struct drm_plane_state *old_plane_state = drm_atomic_get_existing_plane_state(old_state, plane); const struct drm_plane_helper_funcs *plane_funcs; plane_funcs = plane->helper_private; if (!old_plane_state || !plane_funcs) continue; WARN_ON(plane->state->crtc && plane->state->crtc != crtc); if (drm_atomic_plane_disabling(plane, old_plane_state) && plane_funcs->atomic_disable) plane_funcs->atomic_disable(plane, old_plane_state); else if (plane->state->crtc || drm_atomic_plane_disabling(plane, old_plane_state)) plane_funcs->atomic_update(plane, old_plane_state); } if (crtc_funcs && crtc_funcs->atomic_flush) crtc_funcs->atomic_flush(crtc, old_crtc_state); } EXPORT_SYMBOL(drm_atomic_helper_commit_planes_on_crtc); /** * drm_atomic_helper_disable_planes_on_crtc - helper to disable CRTC's planes * @old_crtc_state: atomic state object with the old CRTC state * @atomic: if set, synchronize with CRTC's atomic_begin/flush hooks * * Disables all planes associated with the given CRTC. This can be * used for instance in the CRTC helper atomic_disable callback to disable * all planes. * * If the atomic-parameter is set the function calls the CRTC's * atomic_begin hook before and atomic_flush hook after disabling the * planes. * * It is a bug to call this function without having implemented the * ->atomic_disable() plane hook. */ void drm_atomic_helper_disable_planes_on_crtc(struct drm_crtc_state *old_crtc_state, bool atomic) { struct drm_crtc *crtc = old_crtc_state->crtc; const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; struct drm_plane *plane; if (atomic && crtc_funcs && crtc_funcs->atomic_begin) crtc_funcs->atomic_begin(crtc, NULL); drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) { const struct drm_plane_helper_funcs *plane_funcs = plane->helper_private; if (!plane_funcs) continue; WARN_ON(!plane_funcs->atomic_disable); if (plane_funcs->atomic_disable) plane_funcs->atomic_disable(plane, NULL); } if (atomic && crtc_funcs && crtc_funcs->atomic_flush) crtc_funcs->atomic_flush(crtc, NULL); } EXPORT_SYMBOL(drm_atomic_helper_disable_planes_on_crtc); /** * drm_atomic_helper_cleanup_planes - cleanup plane resources after commit * @dev: DRM device * @old_state: atomic state object with old state structures * * This function cleans up plane state, specifically framebuffers, from the old * configuration. Hence the old configuration must be perserved in @old_state to * be able to call this function. * * This function must also be called on the new state when the atomic update * fails at any point after calling drm_atomic_helper_prepare_planes(). */ void drm_atomic_helper_cleanup_planes(struct drm_device *dev, struct drm_atomic_state *old_state) { struct drm_plane *plane; struct drm_plane_state *plane_state; int i; for_each_plane_in_state(old_state, plane, plane_state, i) { const struct drm_plane_helper_funcs *funcs; if (!drm_atomic_helper_framebuffer_changed(dev, old_state, plane_state->crtc)) continue; funcs = plane->helper_private; if (funcs->cleanup_fb) funcs->cleanup_fb(plane, plane_state); } } EXPORT_SYMBOL(drm_atomic_helper_cleanup_planes); /** * drm_atomic_helper_swap_state - store atomic state into current sw state * @state: atomic state * @stall: stall for proceeding commits * * This function stores the atomic state into the current state pointers in all * driver objects. It should be called after all failing steps have been done * and succeeded, but before the actual hardware state is committed. * * For cleanup and error recovery the current state for all changed objects will * be swaped into @state. * * With that sequence it fits perfectly into the plane prepare/cleanup sequence: * * 1. Call drm_atomic_helper_prepare_planes() with the staged atomic state. * * 2. Do any other steps that might fail. * * 3. Put the staged state into the current state pointers with this function. * * 4. Actually commit the hardware state. * * 5. Call drm_atomic_helper_cleanup_planes() with @state, which since step 3 * contains the old state. Also do any other cleanup required with that state. * * @stall must be set when nonblocking commits for this driver directly access * the ->state pointer of &drm_plane, &drm_crtc or &drm_connector. With the * current atomic helpers this is almost always the case, since the helpers * don't pass the right state structures to the callbacks. */ void drm_atomic_helper_swap_state(struct drm_atomic_state *state, bool stall) { int i; long ret; struct drm_connector *connector; struct drm_connector_state *conn_state; struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_plane *plane; struct drm_plane_state *plane_state; struct drm_crtc_commit *commit; if (stall) { for_each_crtc_in_state(state, crtc, crtc_state, i) { spin_lock(&crtc->commit_lock); commit = list_first_entry_or_null(&crtc->commit_list, struct drm_crtc_commit, commit_entry); if (commit) drm_crtc_commit_get(commit); spin_unlock(&crtc->commit_lock); if (!commit) continue; ret = wait_for_completion_timeout(&commit->hw_done, 10*HZ); if (ret == 0) DRM_ERROR("[CRTC:%d:%s] hw_done timed out\n", crtc->base.id, crtc->name); drm_crtc_commit_put(commit); } } for_each_connector_in_state(state, connector, conn_state, i) { connector->state->state = state; swap(state->connectors[i].state, connector->state); connector->state->state = NULL; } for_each_crtc_in_state(state, crtc, crtc_state, i) { crtc->state->state = state; swap(state->crtcs[i].state, crtc->state); crtc->state->state = NULL; if (state->crtcs[i].commit) { spin_lock(&crtc->commit_lock); list_add(&state->crtcs[i].commit->commit_entry, &crtc->commit_list); spin_unlock(&crtc->commit_lock); state->crtcs[i].commit->event = NULL; } } for_each_plane_in_state(state, plane, plane_state, i) { plane->state->state = state; swap(state->planes[i].state, plane->state); plane->state->state = NULL; } } EXPORT_SYMBOL(drm_atomic_helper_swap_state); /** * drm_atomic_helper_update_plane - Helper for primary plane update using atomic * @plane: plane object to update * @crtc: owning CRTC of owning plane * @fb: framebuffer to flip onto plane * @crtc_x: x offset of primary plane on crtc * @crtc_y: y offset of primary plane on crtc * @crtc_w: width of primary plane rectangle on crtc * @crtc_h: height of primary plane rectangle on crtc * @src_x: x offset of @fb for panning * @src_y: y offset of @fb for panning * @src_w: width of source rectangle in @fb * @src_h: height of source rectangle in @fb * * Provides a default plane update handler using the atomic driver interface. * * RETURNS: * Zero on success, error code on failure */ int drm_atomic_helper_update_plane(struct drm_plane *plane, struct drm_crtc *crtc, struct drm_framebuffer *fb, int crtc_x, int crtc_y, unsigned int crtc_w, unsigned int crtc_h, uint32_t src_x, uint32_t src_y, uint32_t src_w, uint32_t src_h) { struct drm_atomic_state *state; struct drm_plane_state *plane_state; int ret = 0; state = drm_atomic_state_alloc(plane->dev); if (!state) return -ENOMEM; state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); retry: plane_state = drm_atomic_get_plane_state(state, plane); if (IS_ERR(plane_state)) { ret = PTR_ERR(plane_state); goto fail; } ret = drm_atomic_set_crtc_for_plane(plane_state, crtc); if (ret != 0) goto fail; drm_atomic_set_fb_for_plane(plane_state, fb); plane_state->crtc_x = crtc_x; plane_state->crtc_y = crtc_y; plane_state->crtc_w = crtc_w; plane_state->crtc_h = crtc_h; plane_state->src_x = src_x; plane_state->src_y = src_y; plane_state->src_w = src_w; plane_state->src_h = src_h; if (plane == crtc->cursor) state->legacy_cursor_update = true; ret = drm_atomic_commit(state); fail: if (ret == -EDEADLK) goto backoff; drm_atomic_state_put(state); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); /* * Someone might have exchanged the framebuffer while we dropped locks * in the backoff code. We need to fix up the fb refcount tracking the * core does for us. */ plane->old_fb = plane->fb; goto retry; } EXPORT_SYMBOL(drm_atomic_helper_update_plane); /** * drm_atomic_helper_disable_plane - Helper for primary plane disable using * atomic * @plane: plane to disable * * Provides a default plane disable handler using the atomic driver interface. * * RETURNS: * Zero on success, error code on failure */ int drm_atomic_helper_disable_plane(struct drm_plane *plane) { struct drm_atomic_state *state; struct drm_plane_state *plane_state; int ret = 0; /* * FIXME: Without plane->crtc set we can't get at the implicit legacy * acquire context. The real fix will be to wire the acquire ctx through * everywhere we need it, but meanwhile prevent chaos by just skipping * this noop. The critical case is the cursor ioctls which a) only grab * crtc/cursor-plane locks (so we need the crtc to get at the right * acquire context) and b) can try to disable the plane multiple times. */ if (!plane->crtc) return 0; state = drm_atomic_state_alloc(plane->dev); if (!state) return -ENOMEM; state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc); retry: plane_state = drm_atomic_get_plane_state(state, plane); if (IS_ERR(plane_state)) { ret = PTR_ERR(plane_state); goto fail; } if (plane_state->crtc && (plane == plane->crtc->cursor)) plane_state->state->legacy_cursor_update = true; ret = __drm_atomic_helper_disable_plane(plane, plane_state); if (ret != 0) goto fail; ret = drm_atomic_commit(state); fail: if (ret == -EDEADLK) goto backoff; drm_atomic_state_put(state); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); /* * Someone might have exchanged the framebuffer while we dropped locks * in the backoff code. We need to fix up the fb refcount tracking the * core does for us. */ plane->old_fb = plane->fb; goto retry; } EXPORT_SYMBOL(drm_atomic_helper_disable_plane); /* just used from fb-helper and atomic-helper: */ int __drm_atomic_helper_disable_plane(struct drm_plane *plane, struct drm_plane_state *plane_state) { int ret; ret = drm_atomic_set_crtc_for_plane(plane_state, NULL); if (ret != 0) return ret; drm_atomic_set_fb_for_plane(plane_state, NULL); plane_state->crtc_x = 0; plane_state->crtc_y = 0; plane_state->crtc_w = 0; plane_state->crtc_h = 0; plane_state->src_x = 0; plane_state->src_y = 0; plane_state->src_w = 0; plane_state->src_h = 0; return 0; } static int update_output_state(struct drm_atomic_state *state, struct drm_mode_set *set) { struct drm_device *dev = set->crtc->dev; struct drm_crtc *crtc; struct drm_crtc_state *crtc_state; struct drm_connector *connector; struct drm_connector_state *conn_state; int ret, i; ret = drm_modeset_lock(&dev->mode_config.connection_mutex, state->acquire_ctx); if (ret) return ret; /* First disable all connectors on the target crtc. */ ret = drm_atomic_add_affected_connectors(state, set->crtc); if (ret) return ret; for_each_connector_in_state(state, connector, conn_state, i) { if (conn_state->crtc == set->crtc) { ret = drm_atomic_set_crtc_for_connector(conn_state, NULL); if (ret) return ret; } } /* Then set all connectors from set->connectors on the target crtc */ for (i = 0; i < set->num_connectors; i++) { conn_state = drm_atomic_get_connector_state(state, set->connectors[i]); if (IS_ERR(conn_state)) return PTR_ERR(conn_state); ret = drm_atomic_set_crtc_for_connector(conn_state, set->crtc); if (ret) return ret; } for_each_crtc_in_state(state, crtc, crtc_state, i) { /* Don't update ->enable for the CRTC in the set_config request, * since a mismatch would indicate a bug in the upper layers. * The actual modeset code later on will catch any * inconsistencies here. */ if (crtc == set->crtc) continue; if (!crtc_state->connector_mask) { ret = drm_atomic_set_mode_prop_for_crtc(crtc_state, NULL); if (ret < 0) return ret; crtc_state->active = false; } } return 0; } /** * drm_atomic_helper_set_config - set a new config from userspace * @set: mode set configuration * * Provides a default crtc set_config handler using the atomic driver interface. * * Returns: * Returns 0 on success, negative errno numbers on failure. */ int drm_atomic_helper_set_config(struct drm_mode_set *set) { struct drm_atomic_state *state; struct drm_crtc *crtc = set->crtc; int ret = 0; state = drm_atomic_state_alloc(crtc->dev); if (!state) return -ENOMEM; state->legacy_set_config = true; state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); retry: ret = __drm_atomic_helper_set_config(set, state); if (ret != 0) goto fail; ret = drm_atomic_commit(state); fail: if (ret == -EDEADLK) goto backoff; drm_atomic_state_put(state); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); /* * Someone might have exchanged the framebuffer while we dropped locks * in the backoff code. We need to fix up the fb refcount tracking the * core does for us. */ crtc->primary->old_fb = crtc->primary->fb; goto retry; } EXPORT_SYMBOL(drm_atomic_helper_set_config); /* just used from fb-helper and atomic-helper: */ int __drm_atomic_helper_set_config(struct drm_mode_set *set, struct drm_atomic_state *state) { struct drm_crtc_state *crtc_state; struct drm_plane_state *primary_state; struct drm_crtc *crtc = set->crtc; int hdisplay, vdisplay; int ret; crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) return PTR_ERR(crtc_state); primary_state = drm_atomic_get_plane_state(state, crtc->primary); if (IS_ERR(primary_state)) return PTR_ERR(primary_state); if (!set->mode) { WARN_ON(set->fb); WARN_ON(set->num_connectors); ret = drm_atomic_set_mode_for_crtc(crtc_state, NULL); if (ret != 0) return ret; crtc_state->active = false; ret = drm_atomic_set_crtc_for_plane(primary_state, NULL); if (ret != 0) return ret; drm_atomic_set_fb_for_plane(primary_state, NULL); goto commit; } WARN_ON(!set->fb); WARN_ON(!set->num_connectors); ret = drm_atomic_set_mode_for_crtc(crtc_state, set->mode); if (ret != 0) return ret; crtc_state->active = true; ret = drm_atomic_set_crtc_for_plane(primary_state, crtc); if (ret != 0) return ret; drm_crtc_get_hv_timing(set->mode, &hdisplay, &vdisplay); drm_atomic_set_fb_for_plane(primary_state, set->fb); primary_state->crtc_x = 0; primary_state->crtc_y = 0; primary_state->crtc_w = hdisplay; primary_state->crtc_h = vdisplay; primary_state->src_x = set->x << 16; primary_state->src_y = set->y << 16; if (drm_rotation_90_or_270(primary_state->rotation)) { primary_state->src_w = vdisplay << 16; primary_state->src_h = hdisplay << 16; } else { primary_state->src_w = hdisplay << 16; primary_state->src_h = vdisplay << 16; } commit: ret = update_output_state(state, set); if (ret) return ret; return 0; } /** * drm_atomic_helper_disable_all - disable all currently active outputs * @dev: DRM device * @ctx: lock acquisition context * * Loops through all connectors, finding those that aren't turned off and then * turns them off by setting their DPMS mode to OFF and deactivating the CRTC * that they are connected to. * * This is used for example in suspend/resume to disable all currently active * functions when suspending. * * Note that if callers haven't already acquired all modeset locks this might * return -EDEADLK, which must be handled by calling drm_modeset_backoff(). * * Returns: * 0 on success or a negative error code on failure. * * See also: * drm_atomic_helper_suspend(), drm_atomic_helper_resume() */ int drm_atomic_helper_disable_all(struct drm_device *dev, struct drm_modeset_acquire_ctx *ctx) { struct drm_atomic_state *state; struct drm_connector *conn; int err; state = drm_atomic_state_alloc(dev); if (!state) return -ENOMEM; state->acquire_ctx = ctx; drm_for_each_connector(conn, dev) { struct drm_crtc *crtc = conn->state->crtc; struct drm_crtc_state *crtc_state; if (!crtc || conn->dpms != DRM_MODE_DPMS_ON) continue; crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) { err = PTR_ERR(crtc_state); goto free; } crtc_state->active = false; } err = drm_atomic_commit(state); free: drm_atomic_state_put(state); return err; } EXPORT_SYMBOL(drm_atomic_helper_disable_all); /** * drm_atomic_helper_suspend - subsystem-level suspend helper * @dev: DRM device * * Duplicates the current atomic state, disables all active outputs and then * returns a pointer to the original atomic state to the caller. Drivers can * pass this pointer to the drm_atomic_helper_resume() helper upon resume to * restore the output configuration that was active at the time the system * entered suspend. * * Note that it is potentially unsafe to use this. The atomic state object * returned by this function is assumed to be persistent. Drivers must ensure * that this holds true. Before calling this function, drivers must make sure * to suspend fbdev emulation so that nothing can be using the device. * * Returns: * A pointer to a copy of the state before suspend on success or an ERR_PTR()- * encoded error code on failure. Drivers should store the returned atomic * state object and pass it to the drm_atomic_helper_resume() helper upon * resume. * * See also: * drm_atomic_helper_duplicate_state(), drm_atomic_helper_disable_all(), * drm_atomic_helper_resume() */ struct drm_atomic_state *drm_atomic_helper_suspend(struct drm_device *dev) { struct drm_modeset_acquire_ctx ctx; struct drm_atomic_state *state; int err; drm_modeset_acquire_init(&ctx, 0); retry: err = drm_modeset_lock_all_ctx(dev, &ctx); if (err < 0) { state = ERR_PTR(err); goto unlock; } state = drm_atomic_helper_duplicate_state(dev, &ctx); if (IS_ERR(state)) goto unlock; err = drm_atomic_helper_disable_all(dev, &ctx); if (err < 0) { drm_atomic_state_put(state); state = ERR_PTR(err); goto unlock; } unlock: if (PTR_ERR(state) == -EDEADLK) { drm_modeset_backoff(&ctx); goto retry; } drm_modeset_drop_locks(&ctx); drm_modeset_acquire_fini(&ctx); return state; } EXPORT_SYMBOL(drm_atomic_helper_suspend); /** * drm_atomic_helper_resume - subsystem-level resume helper * @dev: DRM device * @state: atomic state to resume to * * Calls drm_mode_config_reset() to synchronize hardware and software states, * grabs all modeset locks and commits the atomic state object. This can be * used in conjunction with the drm_atomic_helper_suspend() helper to * implement suspend/resume for drivers that support atomic mode-setting. * * Returns: * 0 on success or a negative error code on failure. * * See also: * drm_atomic_helper_suspend() */ int drm_atomic_helper_resume(struct drm_device *dev, struct drm_atomic_state *state) { struct drm_mode_config *config = &dev->mode_config; int err; drm_mode_config_reset(dev); drm_modeset_lock_all(dev); state->acquire_ctx = config->acquire_ctx; err = drm_atomic_commit(state); drm_modeset_unlock_all(dev); return err; } EXPORT_SYMBOL(drm_atomic_helper_resume); /** * drm_atomic_helper_crtc_set_property - helper for crtc properties * @crtc: DRM crtc * @property: DRM property * @val: value of property * * Provides a default crtc set_property handler using the atomic driver * interface. * * RETURNS: * Zero on success, error code on failure */ int drm_atomic_helper_crtc_set_property(struct drm_crtc *crtc, struct drm_property *property, uint64_t val) { struct drm_atomic_state *state; struct drm_crtc_state *crtc_state; int ret = 0; state = drm_atomic_state_alloc(crtc->dev); if (!state) return -ENOMEM; /* ->set_property is always called with all locks held. */ state->acquire_ctx = crtc->dev->mode_config.acquire_ctx; retry: crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) { ret = PTR_ERR(crtc_state); goto fail; } ret = drm_atomic_crtc_set_property(crtc, crtc_state, property, val); if (ret) goto fail; ret = drm_atomic_commit(state); fail: if (ret == -EDEADLK) goto backoff; drm_atomic_state_put(state); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); goto retry; } EXPORT_SYMBOL(drm_atomic_helper_crtc_set_property); /** * drm_atomic_helper_plane_set_property - helper for plane properties * @plane: DRM plane * @property: DRM property * @val: value of property * * Provides a default plane set_property handler using the atomic driver * interface. * * RETURNS: * Zero on success, error code on failure */ int drm_atomic_helper_plane_set_property(struct drm_plane *plane, struct drm_property *property, uint64_t val) { struct drm_atomic_state *state; struct drm_plane_state *plane_state; int ret = 0; state = drm_atomic_state_alloc(plane->dev); if (!state) return -ENOMEM; /* ->set_property is always called with all locks held. */ state->acquire_ctx = plane->dev->mode_config.acquire_ctx; retry: plane_state = drm_atomic_get_plane_state(state, plane); if (IS_ERR(plane_state)) { ret = PTR_ERR(plane_state); goto fail; } ret = drm_atomic_plane_set_property(plane, plane_state, property, val); if (ret) goto fail; ret = drm_atomic_commit(state); fail: if (ret == -EDEADLK) goto backoff; drm_atomic_state_put(state); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); goto retry; } EXPORT_SYMBOL(drm_atomic_helper_plane_set_property); /** * drm_atomic_helper_connector_set_property - helper for connector properties * @connector: DRM connector * @property: DRM property * @val: value of property * * Provides a default connector set_property handler using the atomic driver * interface. * * RETURNS: * Zero on success, error code on failure */ int drm_atomic_helper_connector_set_property(struct drm_connector *connector, struct drm_property *property, uint64_t val) { struct drm_atomic_state *state; struct drm_connector_state *connector_state; int ret = 0; state = drm_atomic_state_alloc(connector->dev); if (!state) return -ENOMEM; /* ->set_property is always called with all locks held. */ state->acquire_ctx = connector->dev->mode_config.acquire_ctx; retry: connector_state = drm_atomic_get_connector_state(state, connector); if (IS_ERR(connector_state)) { ret = PTR_ERR(connector_state); goto fail; } ret = drm_atomic_connector_set_property(connector, connector_state, property, val); if (ret) goto fail; ret = drm_atomic_commit(state); fail: if (ret == -EDEADLK) goto backoff; drm_atomic_state_put(state); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); goto retry; } EXPORT_SYMBOL(drm_atomic_helper_connector_set_property); /** * drm_atomic_helper_page_flip - execute a legacy page flip * @crtc: DRM crtc * @fb: DRM framebuffer * @event: optional DRM event to signal upon completion * @flags: flip flags for non-vblank sync'ed updates * * Provides a default page flip implementation using the atomic driver interface. * * Note that for now so called async page flips (i.e. updates which are not * synchronized to vblank) are not supported, since the atomic interfaces have * no provisions for this yet. * * Returns: * Returns 0 on success, negative errno numbers on failure. */ int drm_atomic_helper_page_flip(struct drm_crtc *crtc, struct drm_framebuffer *fb, struct drm_pending_vblank_event *event, uint32_t flags) { struct drm_plane *plane = crtc->primary; struct drm_atomic_state *state; struct drm_plane_state *plane_state; struct drm_crtc_state *crtc_state; int ret = 0; if (flags & DRM_MODE_PAGE_FLIP_ASYNC) return -EINVAL; state = drm_atomic_state_alloc(plane->dev); if (!state) return -ENOMEM; state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); retry: crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) { ret = PTR_ERR(crtc_state); goto fail; } crtc_state->event = event; plane_state = drm_atomic_get_plane_state(state, plane); if (IS_ERR(plane_state)) { ret = PTR_ERR(plane_state); goto fail; } ret = drm_atomic_set_crtc_for_plane(plane_state, crtc); if (ret != 0) goto fail; drm_atomic_set_fb_for_plane(plane_state, fb); /* Make sure we don't accidentally do a full modeset. */ state->allow_modeset = false; if (!crtc_state->active) { DRM_DEBUG_ATOMIC("[CRTC:%d] disabled, rejecting legacy flip\n", crtc->base.id); ret = -EINVAL; goto fail; } ret = drm_atomic_nonblocking_commit(state); fail: if (ret == -EDEADLK) goto backoff; drm_atomic_state_put(state); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); /* * Someone might have exchanged the framebuffer while we dropped locks * in the backoff code. We need to fix up the fb refcount tracking the * core does for us. */ plane->old_fb = plane->fb; goto retry; } EXPORT_SYMBOL(drm_atomic_helper_page_flip); /** * drm_atomic_helper_connector_dpms() - connector dpms helper implementation * @connector: affected connector * @mode: DPMS mode * * This is the main helper function provided by the atomic helper framework for * implementing the legacy DPMS connector interface. It computes the new desired * ->active state for the corresponding CRTC (if the connector is enabled) and * updates it. * * Returns: * Returns 0 on success, negative errno numbers on failure. */ int drm_atomic_helper_connector_dpms(struct drm_connector *connector, int mode) { struct drm_mode_config *config = &connector->dev->mode_config; struct drm_atomic_state *state; struct drm_crtc_state *crtc_state; struct drm_crtc *crtc; struct drm_connector *tmp_connector; int ret; bool active = false; int old_mode = connector->dpms; if (mode != DRM_MODE_DPMS_ON) mode = DRM_MODE_DPMS_OFF; connector->dpms = mode; crtc = connector->state->crtc; if (!crtc) return 0; state = drm_atomic_state_alloc(connector->dev); if (!state) return -ENOMEM; state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc); retry: crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) { ret = PTR_ERR(crtc_state); goto fail; } WARN_ON(!drm_modeset_is_locked(&config->connection_mutex)); drm_for_each_connector(tmp_connector, connector->dev) { if (tmp_connector->state->crtc != crtc) continue; if (tmp_connector->dpms == DRM_MODE_DPMS_ON) { active = true; break; } } crtc_state->active = active; ret = drm_atomic_commit(state); fail: if (ret == -EDEADLK) goto backoff; connector->dpms = old_mode; drm_atomic_state_put(state); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); goto retry; } EXPORT_SYMBOL(drm_atomic_helper_connector_dpms); /** * drm_atomic_helper_best_encoder - Helper for &drm_connector_helper_funcs * ->best_encoder callback * @connector: Connector control structure * * This is a &drm_connector_helper_funcs ->best_encoder callback helper for * connectors that support exactly 1 encoder, statically determined at driver * init time. */ struct drm_encoder * drm_atomic_helper_best_encoder(struct drm_connector *connector) { WARN_ON(connector->encoder_ids[1]); return drm_encoder_find(connector->dev, connector->encoder_ids[0]); } EXPORT_SYMBOL(drm_atomic_helper_best_encoder); /** * DOC: atomic state reset and initialization * * Both the drm core and the atomic helpers assume that there is always the full * and correct atomic software state for all connectors, CRTCs and planes * available. Which is a bit a problem on driver load and also after system * suspend. One way to solve this is to have a hardware state read-out * infrastructure which reconstructs the full software state (e.g. the i915 * driver). * * The simpler solution is to just reset the software state to everything off, * which is easiest to do by calling drm_mode_config_reset(). To facilitate this * the atomic helpers provide default reset implementations for all hooks. * * On the upside the precise state tracking of atomic simplifies system suspend * and resume a lot. For drivers using drm_mode_config_reset() a complete recipe * is implemented in drm_atomic_helper_suspend() and drm_atomic_helper_resume(). * For other drivers the building blocks are split out, see the documentation * for these functions. */ /** * drm_atomic_helper_crtc_reset - default ->reset hook for CRTCs * @crtc: drm CRTC * * Resets the atomic state for @crtc by freeing the state pointer (which might * be NULL, e.g. at driver load time) and allocating a new empty state object. */ void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc) { if (crtc->state) __drm_atomic_helper_crtc_destroy_state(crtc->state); kfree(crtc->state); crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL); if (crtc->state) crtc->state->crtc = crtc; } EXPORT_SYMBOL(drm_atomic_helper_crtc_reset); /** * __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state * @crtc: CRTC object * @state: atomic CRTC state * * Copies atomic state from a CRTC's current state and resets inferred values. * This is useful for drivers that subclass the CRTC state. */ void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc, struct drm_crtc_state *state) { memcpy(state, crtc->state, sizeof(*state)); if (state->mode_blob) drm_property_reference_blob(state->mode_blob); if (state->degamma_lut) drm_property_reference_blob(state->degamma_lut); if (state->ctm) drm_property_reference_blob(state->ctm); if (state->gamma_lut) drm_property_reference_blob(state->gamma_lut); state->mode_changed = false; state->active_changed = false; state->planes_changed = false; state->connectors_changed = false; state->color_mgmt_changed = false; state->zpos_changed = false; state->event = NULL; } EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state); /** * drm_atomic_helper_crtc_duplicate_state - default state duplicate hook * @crtc: drm CRTC * * Default CRTC state duplicate hook for drivers which don't have their own * subclassed CRTC state structure. */ struct drm_crtc_state * drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc) { struct drm_crtc_state *state; if (WARN_ON(!crtc->state)) return NULL; state = kmalloc(sizeof(*state), GFP_KERNEL); if (state) __drm_atomic_helper_crtc_duplicate_state(crtc, state); return state; } EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state); /** * __drm_atomic_helper_crtc_destroy_state - release CRTC state * @state: CRTC state object to release * * Releases all resources stored in the CRTC state without actually freeing * the memory of the CRTC state. This is useful for drivers that subclass the * CRTC state. */ void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state) { drm_property_unreference_blob(state->mode_blob); drm_property_unreference_blob(state->degamma_lut); drm_property_unreference_blob(state->ctm); drm_property_unreference_blob(state->gamma_lut); } EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state); /** * drm_atomic_helper_crtc_destroy_state - default state destroy hook * @crtc: drm CRTC * @state: CRTC state object to release * * Default CRTC state destroy hook for drivers which don't have their own * subclassed CRTC state structure. */ void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc, struct drm_crtc_state *state) { __drm_atomic_helper_crtc_destroy_state(state); kfree(state); } EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state); /** * drm_atomic_helper_plane_reset - default ->reset hook for planes * @plane: drm plane * * Resets the atomic state for @plane by freeing the state pointer (which might * be NULL, e.g. at driver load time) and allocating a new empty state object. */ void drm_atomic_helper_plane_reset(struct drm_plane *plane) { if (plane->state) __drm_atomic_helper_plane_destroy_state(plane->state); kfree(plane->state); plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL); if (plane->state) { plane->state->plane = plane; plane->state->rotation = DRM_ROTATE_0; } } EXPORT_SYMBOL(drm_atomic_helper_plane_reset); /** * __drm_atomic_helper_plane_duplicate_state - copy atomic plane state * @plane: plane object * @state: atomic plane state * * Copies atomic state from a plane's current state. This is useful for * drivers that subclass the plane state. */ void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane, struct drm_plane_state *state) { memcpy(state, plane->state, sizeof(*state)); if (state->fb) drm_framebuffer_reference(state->fb); } EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state); /** * drm_atomic_helper_plane_duplicate_state - default state duplicate hook * @plane: drm plane * * Default plane state duplicate hook for drivers which don't have their own * subclassed plane state structure. */ struct drm_plane_state * drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane) { struct drm_plane_state *state; if (WARN_ON(!plane->state)) return NULL; state = kmalloc(sizeof(*state), GFP_KERNEL); if (state) __drm_atomic_helper_plane_duplicate_state(plane, state); return state; } EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state); /** * __drm_atomic_helper_plane_destroy_state - release plane state * @state: plane state object to release * * Releases all resources stored in the plane state without actually freeing * the memory of the plane state. This is useful for drivers that subclass the * plane state. */ void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state) { if (state->fb) drm_framebuffer_unreference(state->fb); } EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state); /** * drm_atomic_helper_plane_destroy_state - default state destroy hook * @plane: drm plane * @state: plane state object to release * * Default plane state destroy hook for drivers which don't have their own * subclassed plane state structure. */ void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane, struct drm_plane_state *state) { __drm_atomic_helper_plane_destroy_state(state); kfree(state); } EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state); /** * __drm_atomic_helper_connector_reset - reset state on connector * @connector: drm connector * @conn_state: connector state to assign * * Initializes the newly allocated @conn_state and assigns it to * #connector ->state, usually required when initializing the drivers * or when called from the ->reset hook. * * This is useful for drivers that subclass the connector state. */ void __drm_atomic_helper_connector_reset(struct drm_connector *connector, struct drm_connector_state *conn_state) { if (conn_state) conn_state->connector = connector; connector->state = conn_state; } EXPORT_SYMBOL(__drm_atomic_helper_connector_reset); /** * drm_atomic_helper_connector_reset - default ->reset hook for connectors * @connector: drm connector * * Resets the atomic state for @connector by freeing the state pointer (which * might be NULL, e.g. at driver load time) and allocating a new empty state * object. */ void drm_atomic_helper_connector_reset(struct drm_connector *connector) { struct drm_connector_state *conn_state = kzalloc(sizeof(*conn_state), GFP_KERNEL); if (connector->state) __drm_atomic_helper_connector_destroy_state(connector->state); kfree(connector->state); __drm_atomic_helper_connector_reset(connector, conn_state); } EXPORT_SYMBOL(drm_atomic_helper_connector_reset); /** * __drm_atomic_helper_connector_duplicate_state - copy atomic connector state * @connector: connector object * @state: atomic connector state * * Copies atomic state from a connector's current state. This is useful for * drivers that subclass the connector state. */ void __drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector, struct drm_connector_state *state) { memcpy(state, connector->state, sizeof(*state)); if (state->crtc) drm_connector_reference(connector); } EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state); /** * drm_atomic_helper_connector_duplicate_state - default state duplicate hook * @connector: drm connector * * Default connector state duplicate hook for drivers which don't have their own * subclassed connector state structure. */ struct drm_connector_state * drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector) { struct drm_connector_state *state; if (WARN_ON(!connector->state)) return NULL; state = kmalloc(sizeof(*state), GFP_KERNEL); if (state) __drm_atomic_helper_connector_duplicate_state(connector, state); return state; } EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state); /** * drm_atomic_helper_duplicate_state - duplicate an atomic state object * @dev: DRM device * @ctx: lock acquisition context * * Makes a copy of the current atomic state by looping over all objects and * duplicating their respective states. This is used for example by suspend/ * resume support code to save the state prior to suspend such that it can * be restored upon resume. * * Note that this treats atomic state as persistent between save and restore. * Drivers must make sure that this is possible and won't result in confusion * or erroneous behaviour. * * Note that if callers haven't already acquired all modeset locks this might * return -EDEADLK, which must be handled by calling drm_modeset_backoff(). * * Returns: * A pointer to the copy of the atomic state object on success or an * ERR_PTR()-encoded error code on failure. * * See also: * drm_atomic_helper_suspend(), drm_atomic_helper_resume() */ struct drm_atomic_state * drm_atomic_helper_duplicate_state(struct drm_device *dev, struct drm_modeset_acquire_ctx *ctx) { struct drm_atomic_state *state; struct drm_connector *conn; struct drm_plane *plane; struct drm_crtc *crtc; int err = 0; state = drm_atomic_state_alloc(dev); if (!state) return ERR_PTR(-ENOMEM); state->acquire_ctx = ctx; drm_for_each_crtc(crtc, dev) { struct drm_crtc_state *crtc_state; crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) { err = PTR_ERR(crtc_state); goto free; } } drm_for_each_plane(plane, dev) { struct drm_plane_state *plane_state; plane_state = drm_atomic_get_plane_state(state, plane); if (IS_ERR(plane_state)) { err = PTR_ERR(plane_state); goto free; } } drm_for_each_connector(conn, dev) { struct drm_connector_state *conn_state; conn_state = drm_atomic_get_connector_state(state, conn); if (IS_ERR(conn_state)) { err = PTR_ERR(conn_state); goto free; } } /* clear the acquire context so that it isn't accidentally reused */ state->acquire_ctx = NULL; free: if (err < 0) { drm_atomic_state_put(state); state = ERR_PTR(err); } return state; } EXPORT_SYMBOL(drm_atomic_helper_duplicate_state); /** * __drm_atomic_helper_connector_destroy_state - release connector state * @state: connector state object to release * * Releases all resources stored in the connector state without actually * freeing the memory of the connector state. This is useful for drivers that * subclass the connector state. */ void __drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state) { /* * This is currently a placeholder so that drivers that subclass the * state will automatically do the right thing if code is ever added * to this function. */ if (state->crtc) drm_connector_unreference(state->connector); } EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state); /** * drm_atomic_helper_connector_destroy_state - default state destroy hook * @connector: drm connector * @state: connector state object to release * * Default connector state destroy hook for drivers which don't have their own * subclassed connector state structure. */ void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector, struct drm_connector_state *state) { __drm_atomic_helper_connector_destroy_state(state); kfree(state); } EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state); /** * drm_atomic_helper_legacy_gamma_set - set the legacy gamma correction table * @crtc: CRTC object * @red: red correction table * @green: green correction table * @blue: green correction table * @size: size of the tables * * Implements support for legacy gamma correction table for drivers * that support color management through the DEGAMMA_LUT/GAMMA_LUT * properties. */ int drm_atomic_helper_legacy_gamma_set(struct drm_crtc *crtc, u16 *red, u16 *green, u16 *blue, uint32_t size) { struct drm_device *dev = crtc->dev; struct drm_mode_config *config = &dev->mode_config; struct drm_atomic_state *state; struct drm_crtc_state *crtc_state; struct drm_property_blob *blob = NULL; struct drm_color_lut *blob_data; int i, ret = 0; state = drm_atomic_state_alloc(crtc->dev); if (!state) return -ENOMEM; blob = drm_property_create_blob(dev, sizeof(struct drm_color_lut) * size, NULL); if (IS_ERR(blob)) { ret = PTR_ERR(blob); blob = NULL; goto fail; } /* Prepare GAMMA_LUT with the legacy values. */ blob_data = (struct drm_color_lut *) blob->data; for (i = 0; i < size; i++) { blob_data[i].red = red[i]; blob_data[i].green = green[i]; blob_data[i].blue = blue[i]; } state->acquire_ctx = crtc->dev->mode_config.acquire_ctx; retry: crtc_state = drm_atomic_get_crtc_state(state, crtc); if (IS_ERR(crtc_state)) { ret = PTR_ERR(crtc_state); goto fail; } /* Reset DEGAMMA_LUT and CTM properties. */ ret = drm_atomic_crtc_set_property(crtc, crtc_state, config->degamma_lut_property, 0); if (ret) goto fail; ret = drm_atomic_crtc_set_property(crtc, crtc_state, config->ctm_property, 0); if (ret) goto fail; ret = drm_atomic_crtc_set_property(crtc, crtc_state, config->gamma_lut_property, blob->base.id); if (ret) goto fail; ret = drm_atomic_commit(state); fail: if (ret == -EDEADLK) goto backoff; drm_atomic_state_put(state); drm_property_unreference_blob(blob); return ret; backoff: drm_atomic_state_clear(state); drm_atomic_legacy_backoff(state); goto retry; } EXPORT_SYMBOL(drm_atomic_helper_legacy_gamma_set);