[PATCH] drm/bridge/lontium-lt9611uxc: fix provided connector suport

[Robert Foss]

Applied to drm-misc-next

On Fri, 9 Jul 2021 at 01:03, Dmitry Baryshkov
<dmitry.baryshkov at linaro.org> wrote:
>
> - set DRM_CONNECTOR_POLL_HPD as the connector will generate hotplug
>   events on its own
>
> - do not call drm_kms_helper_hotplug_event() unless mode_config.funcs
>   pointer is not NULL to remove possible kernel oops.
>
> Fixes: bc6fa8676ebb ("drm/bridge/lontium-lt9611uxc: move HPD notification out of IRQ handler")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---
>  drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> index 3cac16db970f..010657ea7af7 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> @@ -167,9 +167,10 @@ static void lt9611uxc_hpd_work(struct work_struct *work)
>         struct lt9611uxc *lt9611uxc = container_of(work, struct lt9611uxc, work);
>         bool connected;
>
> -       if (lt9611uxc->connector.dev)
> -               drm_kms_helper_hotplug_event(lt9611uxc->connector.dev);
> -       else {
> +       if (lt9611uxc->connector.dev) {
> +               if (lt9611uxc->connector.dev->mode_config.funcs)
> +                       drm_kms_helper_hotplug_event(lt9611uxc->connector.dev);
> +       } else {
>
>                 mutex_lock(&lt9611uxc->ocm_lock);
>                 connected = lt9611uxc->hdmi_connected;
> @@ -339,6 +340,8 @@ static int lt9611uxc_connector_init(struct drm_bridge *bridge, struct lt9611uxc
>                 return -ENODEV;
>         }
>
> +       lt9611uxc->connector.polled = DRM_CONNECTOR_POLL_HPD;
> +
>         drm_connector_helper_add(&lt9611uxc->connector,
>                                  &lt9611uxc_bridge_connector_helper_funcs);
>         ret = drm_connector_init(bridge->dev, &lt9611uxc->connector,
> --
> 2.30.2
>