linux-imx

/*

 * Copyright (C) 2018 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/drm_atomic_state_helper.h>

#include <drm/drm_crtc.h>

#include <drm/drm_plane.h>

#include <drm/drm_connector.h>

#include <drm/drm_atomic.h>

#include <drm/drm_device.h>

#include <drm/drm_writeback.h>

​

#include <linux/slab.h>

#include <linux/dma-fence.h>

​

/**

 * 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 &drm_crtc_funcs.reset hook for CRTCs

 * @crtc: drm CRTC

 *

 * Resets the atomic state for @crtc by freeing the state pointer (which might