path: root/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c

/*
 * Copyright 2007-8 Advanced Micro Devices, Inc.
 * Copyright 2008 Red Hat Inc.
 *
 * 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: Dave Airlie
 *          Alex Deucher
 */

#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
#include "amdgpu_i2c.h"
#include "atom.h"
#include "amdgpu_connectors.h"
#include "amdgpu_display.h"
#include <asm/div64.h>

#include <linux/pci.h>
#include <linux/pm_runtime.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_edid.h>
#include <drm/drm_gem_framebuffer_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_vblank.h>

static void amdgpu_display_flip_callback(struct dma_fence *f,
					 struct dma_fence_cb *cb)
{
	struct amdgpu_flip_work *work =
		container_of(cb, struct amdgpu_flip_work, cb);

	dma_fence_put(f);
	schedule_work(&work->flip_work.work);
}

static bool amdgpu_display_flip_handle_fence(struct amdgpu_flip_work *work,
					     struct dma_fence **f)
{
	struct dma_fence *fence= *f;

	if (fence == NULL)
		return false;

	*f = NULL;

	if (!dma_fence_add_callback(fence, &work->cb,
				    amdgpu_display_flip_callback))
		return true;

	dma_fence_put(fence);
	return false;
}

static void amdgpu_display_flip_work_func(struct work_struct *__work)
{
	struct delayed_work *delayed_work =
		container_of(__work, struct delayed_work, work);
	struct amdgpu_flip_work *work =
		container_of(delayed_work, struct amdgpu_flip_work, flip_work);
	struct amdgpu_device *adev = work->adev;
	struct amdgpu_crtc *amdgpu_crtc = adev->mode_info.crtcs[work->crtc_id];

	struct drm_crtc *crtc = &amdgpu_crtc->base;
	unsigned long flags;
	unsigned i;
	int vpos, hpos;

	if (amdgpu_display_flip_handle_fence(work, &work->excl))
		return;

	for (i = 0; i < work->shared_count; ++i)
		if (amdgpu_display_flip_handle_fence(work, &work->shared[i]))
			return;

	/* Wait until we're out of the vertical blank period before the one
	 * targeted by the flip
	 */
	if (amdgpu_crtc->enabled &&
	    (amdgpu_display_get_crtc_scanoutpos(adev_to_drm(adev), work<