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https://github.com/edk2-porting/linux-next.git
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321ebf04dc
So my original plan was that the drm core refcounts framebuffers like with the legacy ioctls. But that doesn't work for a bunch of reasons: - State objects might live longer than until the next fb change happens for a plane. For example delayed cleanup work only happens _after_ the pageflip ioctl has completed. So this definitely doesn't work without the plane state holding its own references. - The other issue is transition from legacy to atomic implementations, where the driver works under a mix of both worlds. Which means legacy paths might not properly update the ->fb pointer under plane->state->fb. Which is a bit a problem when then someone comes around and _does_ try to clean it up when it's long gone. The second issue is just a bit a transition bug, since drivers should update plane->state->fb in all the paths that aren't converted yet. But a bit more robustness for the transition can't hurt - we pull similar tricks with cleaning up the old fb in the transitional helpers already. The pattern for drivers that transition is if (plane->state) drm_atomic_set_fb_for_plane(plane->state, plane->fb); inserted after the fb update has logically completed at the end of ->set_config (or ->set_base/mode_set if using the crtc helpers), ->page_flip, ->update_plane or any other entry point which updates plane->fb. v2: Update kerneldoc - copypasta fail. v3: Fix spelling in the commit message (Sean). Reviewed-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
/*
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* Copyright (C) 2014 Red Hat
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* Copyright (C) 2014 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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#ifndef DRM_ATOMIC_H_
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#define DRM_ATOMIC_H_
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struct drm_atomic_state * __must_check
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drm_atomic_state_alloc(struct drm_device *dev);
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void drm_atomic_state_clear(struct drm_atomic_state *state);
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void drm_atomic_state_free(struct drm_atomic_state *state);
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struct drm_crtc_state * __must_check
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drm_atomic_get_crtc_state(struct drm_atomic_state *state,
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struct drm_crtc *crtc);
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struct drm_plane_state * __must_check
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drm_atomic_get_plane_state(struct drm_atomic_state *state,
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struct drm_plane *plane);
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struct drm_connector_state * __must_check
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drm_atomic_get_connector_state(struct drm_atomic_state *state,
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struct drm_connector *connector);
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int __must_check
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drm_atomic_set_crtc_for_plane(struct drm_plane_state *plane_state,
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struct drm_crtc *crtc);
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void drm_atomic_set_fb_for_plane(struct drm_plane_state *plane_state,
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struct drm_framebuffer *fb);
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int __must_check
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drm_atomic_set_crtc_for_connector(struct drm_connector_state *conn_state,
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struct drm_crtc *crtc);
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int __must_check
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drm_atomic_add_affected_connectors(struct drm_atomic_state *state,
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struct drm_crtc *crtc);
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int
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drm_atomic_connectors_for_crtc(struct drm_atomic_state *state,
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struct drm_crtc *crtc);
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void drm_atomic_legacy_backoff(struct drm_atomic_state *state);
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int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
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int __must_check drm_atomic_commit(struct drm_atomic_state *state);
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int __must_check drm_atomic_async_commit(struct drm_atomic_state *state);
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#endif /* DRM_ATOMIC_H_ */
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