1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c
new file mode 100644
index 000000000000..19a9dd5408f3
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_atomic.c
@@ -0,0 +1,237 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * 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 (including the next
+ * paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+/**
+ * DOC: atomic modeset support
+ *
+ * The functions here implement the state management and hardware programming
+ * dispatch required by the atomic modeset infrastructure.
+ * See intel_atomic_plane.c for the plane-specific atomic functionality.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
+#include "intel_drv.h"
+
+
+/**
+ * intel_atomic_check - validate state object
+ * @dev: drm device
+ * @state: state to validate
+ */
+int intel_atomic_check(struct drm_device *dev,
+		       struct drm_atomic_state *state)
+{
+	int nplanes = dev->mode_config.num_total_plane;
+	int ncrtcs = dev->mode_config.num_crtc;
+	int nconnectors = dev->mode_config.num_connector;
+	enum pipe nuclear_pipe = INVALID_PIPE;
+	int ret;
+	int i;
+	bool not_nuclear = false;
+
+	/*
+	 * FIXME:  At the moment, we only support "nuclear pageflip" on a
+	 * single CRTC.  Cross-crtc updates will be added later.
+	 */
+	for (i = 0; i < nplanes; i++) {
+		struct intel_plane *plane = to_intel_plane(state->planes[i]);
+		if (!plane)
+			continue;
+
+		if (nuclear_pipe == INVALID_PIPE) {
+			nuclear_pipe = plane->pipe;
+		} else if (nuclear_pipe != plane->pipe) {
+			DRM_DEBUG_KMS("i915 only support atomic plane operations on a single CRTC at the moment\n");
+			return -EINVAL;
+		}
+	}
+
+	/*
+	 * FIXME:  We only handle planes for now; make sure there are no CRTC's
+	 * or connectors involved.
+	 */
+	state->allow_modeset = false;
+	for (i = 0; i < ncrtcs; i++) {
+		struct intel_crtc *crtc = to_intel_crtc(state->crtcs[i]);
+		if (crtc && crtc->pipe != nuclear_pipe)
+			not_nuclear = true;
+	}
+	for (i = 0; i < nconnectors; i++)
+		if (state->connectors[i] != NULL)
+			not_nuclear = true;
+
+	if (not_nuclear) {
+		DRM_DEBUG_KMS("i915 only supports atomic plane operations at the moment\n");
+		return -EINVAL;
+	}
+
+	ret = drm_atomic_helper_check_planes(dev, state);
+	if (ret)
+		return ret;
+
+	return ret;
+}
+
+
+/**
+ * intel_atomic_commit - commit validated state object
+ * @dev: DRM device
+ * @state: the top-level driver state object
+ * @async: asynchronous commit
+ *
+ * This function commits a top-level state object that has been validated
+ * with drm_atomic_helper_check().
+ *
+ * FIXME:  Atomic modeset support for i915 is not yet complete.  At the moment
+ * we can only handle plane-related operations and do not yet support
+ * asynchronous commit.
+ *
+ * RETURNS
+ * Zero for success or -errno.
+ */
+int intel_atomic_commit(struct drm_device *dev,
+			struct drm_atomic_state *state,
+			bool async)
+{
+	int ret;
+	int i;
+
+	if (async) {
+		DRM_DEBUG_KMS("i915 does not yet support async commit\n");
+		return -EINVAL;
+	}
+
+	ret = drm_atomic_helper_prepare_planes(dev, state);
+	if (ret)
+		return ret;
+
+	/* Point of no return */
+
+	/*
+	 * FIXME:  The proper sequence here will eventually be:
+	 *
+	 * drm_atomic_helper_swap_state(dev, state)
+	 * drm_atomic_helper_commit_pre_planes(dev, state);
+	 * drm_atomic_helper_commit_planes(dev, state);
+	 * drm_atomic_helper_commit_post_planes(dev, state);
+	 * drm_atomic_helper_wait_for_vblanks(dev, state);
+	 * drm_atomic_helper_cleanup_planes(dev, state);
+	 * drm_atomic_state_free(state);
+	 *
+	 * once we have full atomic modeset.  For now, just manually update
+	 * plane states to avoid clobbering good states with dummy states
+	 * while nuclear pageflipping.
+	 */
+	for (i = 0; i < dev->mode_config.num_total_plane; i++) {
+		struct drm_plane *plane = state->planes[i];
+
+		if (!plane)
+			continue;
+
+		plane->state->state = state;
+		swap(state->plane_states[i], plane->state);
+		plane->state->state = NULL;
+	}
+	drm_atomic_helper_commit_planes(dev, state);
+	drm_atomic_helper_wait_for_vblanks(dev, state);
+	drm_atomic_helper_cleanup_planes(dev, state);
+	drm_atomic_state_free(state);
+
+	return 0;
+}
+
+/**
+ * intel_connector_atomic_get_property - fetch connector property value
+ * @connector: connector to fetch property for
+ * @state: state containing the property value
+ * @property: property to look up
+ * @val: pointer to write property value into
+ *
+ * The DRM core does not store shadow copies of properties for
+ * atomic-capable drivers.  This entrypoint is used to fetch
+ * the current value of a driver-specific connector property.
+ */
+int
+intel_connector_atomic_get_property(struct drm_connector *connector,
+				    const struct drm_connector_state *state,
+				    struct drm_property *property,
+				    uint64_t *val)
+{
+	int i;
+
+	/*
+	 * TODO: We only have atomic modeset for planes at the moment, so the
+	 * crtc/connector code isn't quite ready yet.  Until it's ready,
+	 * continue to look up all property values in the DRM's shadow copy
+	 * in obj->properties->values[].
+	 *
+	 * When the crtc/connector state work matures, this function should
+	 * be updated to read the values out of the state structure instead.
+	 */
+	for (i = 0; i < connector->base.properties->count; i++) {
+		if (connector->base.properties->properties[i] == property) {
+			*val = connector->base.properties->values[i];
+			return 0;
+		}
+	}
+
+	return -EINVAL;
+}
+
+/*
+ * intel_crtc_duplicate_state - duplicate crtc state
+ * @crtc: drm crtc
+ *
+ * Allocates and returns a copy of the crtc state (both common and
+ * Intel-specific) for the specified crtc.
+ *
+ * Returns: The newly allocated crtc state, or NULL on failure.
+ */
+struct drm_crtc_state *
+intel_crtc_duplicate_state(struct drm_crtc *crtc)
+{
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
+	if (WARN_ON(!intel_crtc->config))
+		return kzalloc(sizeof(*intel_crtc->config), GFP_KERNEL);
+
+	return kmemdup(intel_crtc->config, sizeof(*intel_crtc->config),
+		       GFP_KERNEL);
+}
+
+/**
+ * intel_crtc_destroy_state - destroy crtc state
+ * @crtc: drm crtc
+ *
+ * Destroys the crtc state (both common and Intel-specific) for the
+ * specified crtc.
+ */
+void
+intel_crtc_destroy_state(struct drm_crtc *crtc,
+			  struct drm_crtc_state *state)
+{
+	drm_atomic_helper_crtc_destroy_state(crtc, state);
+}