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/*
* Copyright (C) 2015 Broadcom
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/**
* DOC: VC4 KMS
*
* This is the general code for implementing KMS mode setting that
* doesn't clearly associate with any of the other objects (plane,
* crtc, HDMI encoder).
*/
#include <drm/drm_crtc.h>
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_plane_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include "vc4_drv.h"
static void
vc4_atomic_complete_commit(struct drm_atomic_state *state)
{
struct drm_device *dev = state->dev;
struct vc4_dev *vc4 = to_vc4_dev(dev);
drm_atomic_helper_wait_for_fences(dev, state, false);
drm_atomic_helper_wait_for_dependencies(state);
drm_atomic_helper_commit_modeset_disables(dev, state);
drm_atomic_helper_commit_planes(dev, state, 0);
drm_atomic_helper_commit_modeset_enables(dev, state);
/* Make sure that drm_atomic_helper_wait_for_vblanks()
* actually waits for vblank. If we're doing a full atomic
* modeset (as opposed to a vc4_update_plane() short circuit),
* then we need to wait for scanout to be done with our
* display lists before we free it and potentially reallocate
* and overwrite the dlist memory with a new modeset.
*/
state->legacy_cursor_update = false;
drm_atomic_helper_commit_hw_done(state);
drm_atomic_helper_wait_for_vblanks(dev, state);
drm_atomic_helper_cleanup_planes(dev, state);
drm_atomic_helper_commit_cleanup_done(state);
drm_atomic_state_put(state);
up(&vc4->async_modeset);
}
static void commit_work(struct work_struct *work)
{
struct drm_atomic_state *state = container_of(work,
struct drm_atomic_state,
commit_work);
vc4_atomic_complete_commit(state);
}
/**
* vc4_atomic_commit - commit validated state object
* @dev: DRM device
* @state: the driver state object
* @nonblock: nonblocking commit
*
* This function commits a with drm_atomic_helper_check() pre-validated state
* object. This can still fail when e.g. the framebuffer reservation fails. For
* now this doesn't implement asynchronous commits.
*
* RETURNS
* Zero for success or -errno.
*/
static int vc4_atomic_commit(struct drm_device *dev,
struct drm_atomic_state *state,
bool nonblock)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
int ret;
ret = drm_atomic_helper_setup_commit(state, nonblock);
if (ret)
return ret;
INIT_WORK(&state->commit_work, commit_work);
ret = down_interruptible(&vc4->async_modeset);
if (ret)
return ret;
ret = drm_atomic_helper_prepare_planes(dev, state);
if (ret) {
up(&vc4->async_modeset);
return ret;
}
if (!nonblock) {
ret = drm_atomic_helper_wait_for_fences(dev, state, true);
if (ret) {
drm_atomic_helper_cleanup_planes(dev, state);
up(&vc4->async_modeset);
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.
*/
BUG_ON(drm_atomic_helper_swap_state(state, false) < 0);
/*
* 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.
*/
drm_atomic_state_get(state);
if (nonblock)
queue_work(system_unbound_wq, &state->commit_work);
else
vc4_atomic_complete_commit(state);
return 0;
}
static struct drm_framebuffer *vc4_fb_create(struct drm_device *dev,
struct drm_file *file_priv,
const struct drm_mode_fb_cmd2 *mode_cmd)
{
struct drm_mode_fb_cmd2 mode_cmd_local;
/* If the user didn't specify a modifier, use the
* vc4_set_tiling_ioctl() state for the BO.
*/
if (!(mode_cmd->flags & DRM_MODE_FB_MODIFIERS)) {
struct drm_gem_object *gem_obj;
struct vc4_bo *bo;
gem_obj = drm_gem_object_lookup(file_priv,
mode_cmd->handles[0]);
if (!gem_obj) {
DRM_DEBUG("Failed to look up GEM BO %d\n",
mode_cmd->handles[0]);
return ERR_PTR(-ENOENT);
}
bo = to_vc4_bo(gem_obj);
mode_cmd_local = *mode_cmd;
if (bo->t_format) {
mode_cmd_local.modifier[0] =
DRM_FORMAT_MOD_BROADCOM_VC4_T_TILED;
} else {
mode_cmd_local.modifier[0] = DRM_FORMAT_MOD_NONE;
}
drm_gem_object_put_unlocked(gem_obj);
mode_cmd = &mode_cmd_local;
}
return drm_gem_fb_create(dev, file_priv, mode_cmd);
}
static const struct drm_mode_config_funcs vc4_mode_funcs = {
.output_poll_changed = drm_fb_helper_output_poll_changed,
.atomic_check = drm_atomic_helper_check,
.atomic_commit = vc4_atomic_commit,
.fb_create = vc4_fb_create,
};
int vc4_kms_load(struct drm_device *dev)
{
struct vc4_dev *vc4 = to_vc4_dev(dev);
int ret;
sema_init(&vc4->async_modeset, 1);
/* Set support for vblank irq fast disable, before drm_vblank_init() */
dev->vblank_disable_immediate = true;
ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
if (ret < 0) {
dev_err(dev->dev, "failed to initialize vblank\n");
return ret;
}
dev->mode_config.max_width = 2048;
dev->mode_config.max_height = 2048;
dev->mode_config.funcs = &vc4_mode_funcs;
dev->mode_config.preferred_depth = 24;
dev->mode_config.async_page_flip = true;
dev->mode_config.allow_fb_modifiers = true;
drm_mode_config_reset(dev);
if (dev->mode_config.num_connector)
drm_fb_cma_fbdev_init(dev, 32, 0);
drm_kms_helper_poll_init(dev);
return 0;
}
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