Unverified Commit c48935ab authored Jun 16, 2021 by Maxime Ripard

drm/dp_helper: Mention the concurrency requirement hw_mutex

Drivers that allow concurrent access over multiple DP channels need to
provide additional locking, even though the hw_mutex field might
indicate otherwise. Clarify it in the documentation.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210616141529.630719-2-maxime@cerno.tech

parent 14407d3a

include/drm/drm_dp_helper.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -1913,6 +1913,10 @@ struct drm_dp_aux {

		/**
		* @hw_mutex: internal mutex used for locking transfers.
		*
		* Note that if the underlying hardware is shared among multiple
		* channels, the driver needs to do additional locking to
		* prevent concurrent access.
		*/
		struct mutex hw_mutex;