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drm/dp_helper: Mention the concurrency requirement hw_mutex

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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
This commit is contained in:
Maxime Ripard 2021-06-16 16:15:28 +02:00
parent 14407d3afe
commit c48935ab6b
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1 changed files with 4 additions and 0 deletions
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4
include/drm/drm_dp_helper.h
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@ -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;