diff options
Diffstat (limited to 'drivers/gpu/drm/drm_bridge.c')
| -rw-r--r-- | drivers/gpu/drm/drm_bridge.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c index 521a71c61b16..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, @@ -687,11 +694,17 @@ void drm_atomic_bridge_chain_post_disable(struct drm_bridge *bridge, */ list_for_each_entry_from(next, &encoder->bridge_chain, chain_node) { - if (next->pre_enable_prev_first) { + if (!next->pre_enable_prev_first) { next = list_prev_entry(next, chain_node); limit = next; break; } + + if (list_is_last(&next->chain_node, + &encoder->bridge_chain)) { + limit = next; + break; + } } /* Call these bridges in reverse order */ @@ -747,6 +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, @@ -774,7 +794,7 @@ void drm_atomic_bridge_chain_pre_enable(struct drm_bridge *bridge, /* Found first bridge that does NOT * request prev to be enabled first */ - limit = list_prev_entry(next, chain_node); + limit = next; break; } } |