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| author | Jagan Teki <jagan@amarulasolutions.com> | 2023-03-28 22:37:52 +0530 |
|---|---|---|
| committer | Robert Foss <rfoss@kernel.org> | 2024-03-05 15:43:23 +0100 |
| commit | 113cc3ad8566e06d6c8ef4fc0075a938dedefab5 (patch) | |
| tree | 0b29a94c68d2703be2e3673fb7ac1667f0e5bed5 | |
| parent | e18aeeda0b6905c333df5a0566b99f5c84426098 (diff) | |
| download | linux-stable-113cc3ad8566e06d6c8ef4fc0075a938dedefab5.tar.gz linux-stable-113cc3ad8566e06d6c8ef4fc0075a938dedefab5.tar.bz2 linux-stable-113cc3ad8566e06d6c8ef4fc0075a938dedefab5.zip | |
drm/bridge: Document bridge init order with pre_enable_prev_first
In order to satisfy the MIPI DSI initialization sequence the bridge
init order has been altered with the help of pre_enable_prev_first
in pre_enable and post_disable bridge operations.
Document the affected bridge init order with an example on the
bridge operations helpers.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230328170752.1102347-2-jagan@amarulasolutions.com
| -rw-r--r-- | drivers/gpu/drm/drm_bridge.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 17ed94885dc3..28abe9aa99ca 100644 --- a/drivers/gpu/drm/drm_bridge.c +++ b/drivers/gpu/drm/drm_bridge.c @@ -657,6 +657,13 @@ static void drm_atomic_bridge_call_post_disable(struct drm_bridge *bridge, * bridge will be called before the previous one to reverse the @pre_enable * calling direction. * + * Example: + * Bridge A ---> Bridge B ---> Bridge C ---> Bridge D ---> Bridge E + * + * With pre_enable_prev_first flag enable in Bridge B, D, E then the resulting + * @post_disable order would be, + * Bridge B, Bridge A, Bridge E, Bridge D, Bridge C. + * * Note: the bridge passed should be the one closest to the encoder */ void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge, @@ -753,6 +760,13 @@ static void drm_atomic_bridge_call_pre_enable(struct drm_bridge *bridge, * If a bridge sets @pre_enable_prev_first, then the pre_enable for the * prev bridge will be called before pre_enable of this bridge. * + * Example: + * Bridge A ---> Bridge B ---> Bridge C ---> Bridge D ---> Bridge E + * + * With pre_enable_prev_first flag enable in Bridge B, D, E then the resulting + * @pre_enable order would be, + * Bridge C, Bridge D, Bridge E, Bridge A, Bridge B. + * * Note: the bridge passed should be the one closest to the encoder */ void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge, |