diff mbox series

[v2,01/14] drm/bridge: Fix the stop condition of drm_bridge_chain_pre_enable()

Message ID 20210329195255.v2.1.If62a003f76a2bc4ccc6c53565becc05d2aad4430@changeid (mailing list archive)
State Superseded
Headers show
Series drm: Fix EDID reading on ti-sn65dsi86 | expand

Commit Message

Doug Anderson March 30, 2021, 2:53 a.m. UTC 
The drm_bridge_chain_pre_enable() is not the proper opposite of
drm_bridge_chain_post_disable(). It continues along the chain to
_before_ the starting bridge. Let's fix that.

Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

(no changes since v1)

 drivers/gpu/drm/drm_bridge.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Andrzej Hajda March 31, 2021, 9:05 a.m. UTC | #1 
Hi Douglas,

W dniu 30.03.2021 o 04:53, Douglas Anderson pisze:
> The drm_bridge_chain_pre_enable() is not the proper opposite of
> drm_bridge_chain_post_disable(). It continues along the chain to
> _before_ the starting bridge. Let's fix that.
>
> Fixes: 05193dc38197 ("drm/bridge: Make the bridge chain a double-linked list")
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> ---
>
> (no changes since v1)
>
>   drivers/gpu/drm/drm_bridge.c | 3 +++
>   1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index 64f0effb52ac..044acd07c153 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -522,6 +522,9 @@ void drm_bridge_chain_pre_enable(struct drm_bridge *bridge)
>   	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
>   		if (iter->funcs->pre_enable)
>   			iter->funcs->pre_enable(iter);
> +
> +		if (iter == bridge)
> +			break;


Looking at the bridge chaining code always makes me sick :) but beside 
this the change looks correct, and follows 
drm_atomic_bridge_chain_pre_enable.

Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>

Regards
Andrzej

>   	}
>   }
>   EXPORT_SYMBOL(drm_bridge_chain_pre_enable);
diff mbox series

Patch

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 64f0effb52ac..044acd07c153 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -522,6 +522,9 @@  void drm_bridge_chain_pre_enable(struct drm_bridge *bridge)
 	list_for_each_entry_reverse(iter, &encoder->bridge_chain, chain_node) {
 		if (iter->funcs->pre_enable)
 			iter->funcs->pre_enable(iter);
+
+		if (iter == bridge)
+			break;
 	}
 }
 EXPORT_SYMBOL(drm_bridge_chain_pre_enable);