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

Andrzej Hajda
2021-03-31T09:06:56Z

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);