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Commit 1b94f477 authored by Daniel Vetter's avatar Daniel Vetter
Browse files

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



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: default avatarPekka Paalanen <pekka.paalanen@collabora.com>
Signed-off-by: default avatarDaniel 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
parent b232d4ed

drivers/gpu/drm/drm_gem_framebuffer_helper.c

+6 −0
Original line number Diff line number Diff line
@@ -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)

include/drm/drm_plane.h

+1 −1
Original line number Diff line number Diff line
@@ -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.

	 *