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drm/docs: More links for implicit/explicit fencing.

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drm_atomic_set_fence_for_plane() contains the main discussion from a
driver pov, link to that from more places.

Cc: Pekka Paalanen <pekka.paalanen@collabora.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: Sean Paul <sean@poorly.run>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20190603142848.26487-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2019-06-03 16:28:48 +02:00
parent b232d4ed92
commit 1b94f47793
2 changed files with 7 additions and 1 deletions
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6
drivers/gpu/drm/drm_gem_framebuffer_helper.c
View File

@ -284,6 +284,9 @@ EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty);
* There is no need for &drm_plane_helper_funcs.cleanup_fb hook for simple
* gem based framebuffer drivers which have their buffers always pinned in
* memory.
*
* See drm_atomic_set_fence_for_plane() for a discussion of implicit and
* explicit fencing in atomic modeset updates.
*/
int drm_gem_fb_prepare_fb(struct drm_plane *plane,
struct drm_plane_state *state)
@ -314,6 +317,9 @@ EXPORT_SYMBOL_GPL(drm_gem_fb_prepare_fb);
* &dma_buf attached, extracts the exclusive fence and attaches it to plane
* state for the atomic helper to wait on. Drivers can use this as their
* &drm_simple_display_pipe_funcs.prepare_fb callback.
*
* See drm_atomic_set_fence_for_plane() for a discussion of implicit and
* explicit fencing in atomic modeset updates.
*/
int drm_gem_fb_simple_display_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
struct drm_plane_state *plane_state)

2
include/drm/drm_plane.h
View File

@ -69,7 +69,7 @@ struct drm_plane_state {
*
* Optional fence to wait for before scanning out @fb. The core atomic
* code will set this when userspace is using explicit fencing. Do not
* write this directly for a driver's implicit fence, use
* write this field directly for a driver's implicit fence, use
* drm_atomic_set_fence_for_plane() to ensure that an explicit fence is
* preserved.
*