448 lines
14 KiB
C
448 lines
14 KiB
C
/*
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* Copyright (C) 2018 Intel Corp.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Rob Clark <robdclark@gmail.com>
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* Daniel Vetter <daniel.vetter@ffwll.ch>
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*/
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#include <drm/drm_atomic_state_helper.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_plane.h>
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#include <drm/drm_connector.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_device.h>
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#include <linux/slab.h>
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#include <linux/dma-fence.h>
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/**
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* DOC: atomic state reset and initialization
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*
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* Both the drm core and the atomic helpers assume that there is always the full
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* and correct atomic software state for all connectors, CRTCs and planes
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* available. Which is a bit a problem on driver load and also after system
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* suspend. One way to solve this is to have a hardware state read-out
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* infrastructure which reconstructs the full software state (e.g. the i915
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* driver).
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*
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* The simpler solution is to just reset the software state to everything off,
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* which is easiest to do by calling drm_mode_config_reset(). To facilitate this
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* the atomic helpers provide default reset implementations for all hooks.
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*
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* On the upside the precise state tracking of atomic simplifies system suspend
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* and resume a lot. For drivers using drm_mode_config_reset() a complete recipe
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* is implemented in drm_atomic_helper_suspend() and drm_atomic_helper_resume().
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* For other drivers the building blocks are split out, see the documentation
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* for these functions.
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*/
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/**
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* drm_atomic_helper_crtc_reset - default &drm_crtc_funcs.reset hook for CRTCs
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* @crtc: drm CRTC
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*
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* Resets the atomic state for @crtc by freeing the state pointer (which might
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* be NULL, e.g. at driver load time) and allocating a new empty state object.
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*/
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void drm_atomic_helper_crtc_reset(struct drm_crtc *crtc)
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{
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if (crtc->state)
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__drm_atomic_helper_crtc_destroy_state(crtc->state);
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kfree(crtc->state);
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crtc->state = kzalloc(sizeof(*crtc->state), GFP_KERNEL);
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if (crtc->state)
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crtc->state->crtc = crtc;
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}
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EXPORT_SYMBOL(drm_atomic_helper_crtc_reset);
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/**
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* __drm_atomic_helper_crtc_duplicate_state - copy atomic CRTC state
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* @crtc: CRTC object
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* @state: atomic CRTC state
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*
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* Copies atomic state from a CRTC's current state and resets inferred values.
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* This is useful for drivers that subclass the CRTC state.
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*/
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void __drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc,
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struct drm_crtc_state *state)
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{
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memcpy(state, crtc->state, sizeof(*state));
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if (state->mode_blob)
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drm_property_blob_get(state->mode_blob);
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if (state->degamma_lut)
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drm_property_blob_get(state->degamma_lut);
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if (state->ctm)
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drm_property_blob_get(state->ctm);
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if (state->gamma_lut)
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drm_property_blob_get(state->gamma_lut);
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state->mode_changed = false;
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state->active_changed = false;
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state->planes_changed = false;
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state->connectors_changed = false;
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state->color_mgmt_changed = false;
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state->zpos_changed = false;
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state->commit = NULL;
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state->event = NULL;
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state->pageflip_flags = 0;
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}
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EXPORT_SYMBOL(__drm_atomic_helper_crtc_duplicate_state);
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/**
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* drm_atomic_helper_crtc_duplicate_state - default state duplicate hook
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* @crtc: drm CRTC
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*
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* Default CRTC state duplicate hook for drivers which don't have their own
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* subclassed CRTC state structure.
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*/
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struct drm_crtc_state *
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drm_atomic_helper_crtc_duplicate_state(struct drm_crtc *crtc)
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{
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struct drm_crtc_state *state;
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if (WARN_ON(!crtc->state))
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return NULL;
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state = kmalloc(sizeof(*state), GFP_KERNEL);
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if (state)
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__drm_atomic_helper_crtc_duplicate_state(crtc, state);
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return state;
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}
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EXPORT_SYMBOL(drm_atomic_helper_crtc_duplicate_state);
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/**
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* __drm_atomic_helper_crtc_destroy_state - release CRTC state
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* @state: CRTC state object to release
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*
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* Releases all resources stored in the CRTC state without actually freeing
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* the memory of the CRTC state. This is useful for drivers that subclass the
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* CRTC state.
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*/
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void __drm_atomic_helper_crtc_destroy_state(struct drm_crtc_state *state)
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{
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if (state->commit) {
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/*
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* In the event that a non-blocking commit returns
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* -ERESTARTSYS before the commit_tail work is queued, we will
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* have an extra reference to the commit object. Release it, if
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* the event has not been consumed by the worker.
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*
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* state->event may be freed, so we can't directly look at
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* state->event->base.completion.
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*/
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if (state->event && state->commit->abort_completion)
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drm_crtc_commit_put(state->commit);
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kfree(state->commit->event);
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state->commit->event = NULL;
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drm_crtc_commit_put(state->commit);
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}
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drm_property_blob_put(state->mode_blob);
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drm_property_blob_put(state->degamma_lut);
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drm_property_blob_put(state->ctm);
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drm_property_blob_put(state->gamma_lut);
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}
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EXPORT_SYMBOL(__drm_atomic_helper_crtc_destroy_state);
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/**
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* drm_atomic_helper_crtc_destroy_state - default state destroy hook
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* @crtc: drm CRTC
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* @state: CRTC state object to release
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*
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* Default CRTC state destroy hook for drivers which don't have their own
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* subclassed CRTC state structure.
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*/
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void drm_atomic_helper_crtc_destroy_state(struct drm_crtc *crtc,
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struct drm_crtc_state *state)
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{
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__drm_atomic_helper_crtc_destroy_state(state);
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kfree(state);
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}
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EXPORT_SYMBOL(drm_atomic_helper_crtc_destroy_state);
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/**
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* __drm_atomic_helper_plane_reset - resets planes state to default values
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* @plane: plane object, must not be NULL
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* @state: atomic plane state, must not be NULL
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*
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* Initializes plane state to default. This is useful for drivers that subclass
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* the plane state.
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*/
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void __drm_atomic_helper_plane_reset(struct drm_plane *plane,
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struct drm_plane_state *state)
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{
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state->plane = plane;
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state->rotation = DRM_MODE_ROTATE_0;
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state->alpha = DRM_BLEND_ALPHA_OPAQUE;
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state->pixel_blend_mode = DRM_MODE_BLEND_PREMULTI;
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plane->state = state;
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}
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EXPORT_SYMBOL(__drm_atomic_helper_plane_reset);
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/**
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* drm_atomic_helper_plane_reset - default &drm_plane_funcs.reset hook for planes
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* @plane: drm plane
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*
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* Resets the atomic state for @plane by freeing the state pointer (which might
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* be NULL, e.g. at driver load time) and allocating a new empty state object.
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*/
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void drm_atomic_helper_plane_reset(struct drm_plane *plane)
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{
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if (plane->state)
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__drm_atomic_helper_plane_destroy_state(plane->state);
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kfree(plane->state);
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plane->state = kzalloc(sizeof(*plane->state), GFP_KERNEL);
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if (plane->state)
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__drm_atomic_helper_plane_reset(plane, plane->state);
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}
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EXPORT_SYMBOL(drm_atomic_helper_plane_reset);
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/**
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* __drm_atomic_helper_plane_duplicate_state - copy atomic plane state
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* @plane: plane object
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* @state: atomic plane state
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*
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* Copies atomic state from a plane's current state. This is useful for
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* drivers that subclass the plane state.
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*/
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void __drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane,
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struct drm_plane_state *state)
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{
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memcpy(state, plane->state, sizeof(*state));
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if (state->fb)
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drm_framebuffer_get(state->fb);
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state->fence = NULL;
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state->commit = NULL;
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state->fb_damage_clips = NULL;
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}
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EXPORT_SYMBOL(__drm_atomic_helper_plane_duplicate_state);
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/**
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* drm_atomic_helper_plane_duplicate_state - default state duplicate hook
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* @plane: drm plane
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*
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* Default plane state duplicate hook for drivers which don't have their own
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* subclassed plane state structure.
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*/
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struct drm_plane_state *
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drm_atomic_helper_plane_duplicate_state(struct drm_plane *plane)
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{
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struct drm_plane_state *state;
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if (WARN_ON(!plane->state))
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return NULL;
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state = kmalloc(sizeof(*state), GFP_KERNEL);
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if (state)
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__drm_atomic_helper_plane_duplicate_state(plane, state);
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return state;
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}
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EXPORT_SYMBOL(drm_atomic_helper_plane_duplicate_state);
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/**
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* __drm_atomic_helper_plane_destroy_state - release plane state
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* @state: plane state object to release
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*
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* Releases all resources stored in the plane state without actually freeing
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* the memory of the plane state. This is useful for drivers that subclass the
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* plane state.
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*/
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void __drm_atomic_helper_plane_destroy_state(struct drm_plane_state *state)
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{
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if (state->fb)
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drm_framebuffer_put(state->fb);
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if (state->fence)
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dma_fence_put(state->fence);
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if (state->commit)
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drm_crtc_commit_put(state->commit);
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drm_property_blob_put(state->fb_damage_clips);
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}
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EXPORT_SYMBOL(__drm_atomic_helper_plane_destroy_state);
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/**
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* drm_atomic_helper_plane_destroy_state - default state destroy hook
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* @plane: drm plane
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* @state: plane state object to release
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*
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* Default plane state destroy hook for drivers which don't have their own
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* subclassed plane state structure.
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*/
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void drm_atomic_helper_plane_destroy_state(struct drm_plane *plane,
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struct drm_plane_state *state)
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{
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__drm_atomic_helper_plane_destroy_state(state);
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kfree(state);
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}
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EXPORT_SYMBOL(drm_atomic_helper_plane_destroy_state);
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/**
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* __drm_atomic_helper_connector_reset - reset state on connector
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* @connector: drm connector
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* @conn_state: connector state to assign
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*
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* Initializes the newly allocated @conn_state and assigns it to
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* the &drm_conector->state pointer of @connector, usually required when
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* initializing the drivers or when called from the &drm_connector_funcs.reset
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* hook.
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*
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* This is useful for drivers that subclass the connector state.
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*/
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void
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__drm_atomic_helper_connector_reset(struct drm_connector *connector,
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struct drm_connector_state *conn_state)
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{
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if (conn_state)
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conn_state->connector = connector;
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connector->state = conn_state;
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}
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EXPORT_SYMBOL(__drm_atomic_helper_connector_reset);
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/**
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* drm_atomic_helper_connector_reset - default &drm_connector_funcs.reset hook for connectors
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* @connector: drm connector
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*
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* Resets the atomic state for @connector by freeing the state pointer (which
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* might be NULL, e.g. at driver load time) and allocating a new empty state
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* object.
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*/
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void drm_atomic_helper_connector_reset(struct drm_connector *connector)
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{
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struct drm_connector_state *conn_state =
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kzalloc(sizeof(*conn_state), GFP_KERNEL);
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if (connector->state)
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__drm_atomic_helper_connector_destroy_state(connector->state);
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kfree(connector->state);
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__drm_atomic_helper_connector_reset(connector, conn_state);
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}
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EXPORT_SYMBOL(drm_atomic_helper_connector_reset);
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/**
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* __drm_atomic_helper_connector_duplicate_state - copy atomic connector state
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* @connector: connector object
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* @state: atomic connector state
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*
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* Copies atomic state from a connector's current state. This is useful for
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* drivers that subclass the connector state.
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*/
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void
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__drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector,
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struct drm_connector_state *state)
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{
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memcpy(state, connector->state, sizeof(*state));
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if (state->crtc)
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drm_connector_get(connector);
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state->commit = NULL;
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/* Don't copy over a writeback job, they are used only once */
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state->writeback_job = NULL;
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}
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EXPORT_SYMBOL(__drm_atomic_helper_connector_duplicate_state);
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/**
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* drm_atomic_helper_connector_duplicate_state - default state duplicate hook
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* @connector: drm connector
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*
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* Default connector state duplicate hook for drivers which don't have their own
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* subclassed connector state structure.
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*/
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struct drm_connector_state *
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drm_atomic_helper_connector_duplicate_state(struct drm_connector *connector)
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{
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struct drm_connector_state *state;
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if (WARN_ON(!connector->state))
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return NULL;
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state = kmalloc(sizeof(*state), GFP_KERNEL);
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if (state)
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__drm_atomic_helper_connector_duplicate_state(connector, state);
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return state;
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}
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EXPORT_SYMBOL(drm_atomic_helper_connector_duplicate_state);
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/**
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* __drm_atomic_helper_connector_destroy_state - release connector state
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* @state: connector state object to release
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*
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* Releases all resources stored in the connector state without actually
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* freeing the memory of the connector state. This is useful for drivers that
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* subclass the connector state.
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*/
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void
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__drm_atomic_helper_connector_destroy_state(struct drm_connector_state *state)
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{
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if (state->crtc)
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drm_connector_put(state->connector);
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if (state->commit)
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drm_crtc_commit_put(state->commit);
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}
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EXPORT_SYMBOL(__drm_atomic_helper_connector_destroy_state);
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/**
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* drm_atomic_helper_connector_destroy_state - default state destroy hook
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* @connector: drm connector
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* @state: connector state object to release
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*
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* Default connector state destroy hook for drivers which don't have their own
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* subclassed connector state structure.
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*/
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void drm_atomic_helper_connector_destroy_state(struct drm_connector *connector,
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struct drm_connector_state *state)
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{
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__drm_atomic_helper_connector_destroy_state(state);
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kfree(state);
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}
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EXPORT_SYMBOL(drm_atomic_helper_connector_destroy_state);
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/**
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* __drm_atomic_helper_private_duplicate_state - copy atomic private state
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* @obj: CRTC object
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* @state: new private object state
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*
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* Copies atomic state from a private objects's current state and resets inferred values.
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* This is useful for drivers that subclass the private state.
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*/
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void __drm_atomic_helper_private_obj_duplicate_state(struct drm_private_obj *obj,
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struct drm_private_state *state)
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{
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memcpy(state, obj->state, sizeof(*state));
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}
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EXPORT_SYMBOL(__drm_atomic_helper_private_obj_duplicate_state);
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