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SubjectRe: [PATCH] drm/bridge_connector: enable HPD by default if supported
Hi Nikita,

Le sam., déc. 25 2021 at 09:31:51 +0300, Nikita Yushchenko
<nikita.yoush@cogentembedded.com> a écrit :
> Hotplug events reported by bridge drivers over drm_bridge_hpd_notify()
> get ignored unless somebody calls drm_bridge_hpd_enable(). When the
> connector for the bridge is bridge_connector, such a call is done from
> drm_bridge_connector_enable_hpd().
>
> However drm_bridge_connector_enable_hpd() is never called on init
> paths,
> documentation suggests that it is intended for suspend/resume paths.
>
> In result, once encoders are switched to bridge_connector,
> bridge-detected HPD stops working.
>
> This patch adds a call to that API on init path.
>
> This fixes HDMI HPD with rcar-du + adv7513 case when adv7513 reports
> HPD
> events via interrupts.
>
> Fixes: c24110a8fd09 ("drm: rcar-du: Use drm_bridge_connector_init()
> helper")
> Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>

Merged to drm-misc-next.

Thanks!

Cheers,
-Paul

> ---
> drivers/gpu/drm/drm_bridge_connector.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_bridge_connector.c
> b/drivers/gpu/drm/drm_bridge_connector.c
> index 791379816837..4f20137ef21d 100644
> --- a/drivers/gpu/drm/drm_bridge_connector.c
> +++ b/drivers/gpu/drm/drm_bridge_connector.c
> @@ -369,8 +369,10 @@ struct drm_connector
> *drm_bridge_connector_init(struct drm_device *drm,
> connector_type, ddc);
> drm_connector_helper_add(connector,
> &drm_bridge_connector_helper_funcs);
>
> - if (bridge_connector->bridge_hpd)
> + if (bridge_connector->bridge_hpd) {
> connector->polled = DRM_CONNECTOR_POLL_HPD;
> + drm_bridge_connector_enable_hpd(connector);
> + }
> else if (bridge_connector->bridge_detect)
> connector->polled = DRM_CONNECTOR_POLL_CONNECT
> | DRM_CONNECTOR_POLL_DISCONNECT;
> --
> 2.30.2


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