[PATCH 1/2] drm/bridge/lontium-lt9611uxc: fix waiting for EDID to become available

[Dmitry Baryshkov]

Gracious ping for these two patches

On Fri, 27 Nov 2020 at 12:23, Dmitry Baryshkov
<dmitry.baryshkov at linaro.org> wrote:
>
> - Call wake_up() when EDID ready event is received to wake
>   wait_event_interruptible_timeout()
>
> - Increase waiting timeout, reading EDID can take longer than 100ms, so
>   let's be on a safe side.
>
> - Return NULL pointer from get_edid() callback rather than ERR_PTR()
>   pointer, as DRM code does NULL checks rather than IS_ERR().
>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> ---
>  drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> index 0c98d27f84ac..b708700e182d 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> @@ -145,8 +145,10 @@ static irqreturn_t lt9611uxc_irq_thread_handler(int irq, void *dev_id)
>
>         lt9611uxc_unlock(lt9611uxc);
>
> -       if (irq_status & BIT(0))
> +       if (irq_status & BIT(0)) {
>                 lt9611uxc->edid_read = !!(hpd_status & BIT(0));
> +               wake_up_all(&lt9611uxc->wq);
> +       }
>
>         if (irq_status & BIT(1)) {
>                 if (lt9611uxc->connector.dev)
> @@ -465,7 +467,7 @@ static enum drm_connector_status lt9611uxc_bridge_detect(struct drm_bridge *brid
>  static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc)
>  {
>         return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read,
> -                       msecs_to_jiffies(100));
> +                       msecs_to_jiffies(500));
>  }
>
>  static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
> @@ -503,7 +505,10 @@ static struct edid *lt9611uxc_bridge_get_edid(struct drm_bridge *bridge,
>         ret = lt9611uxc_wait_for_edid(lt9611uxc);
>         if (ret < 0) {
>                 dev_err(lt9611uxc->dev, "wait for EDID failed: %d\n", ret);
> -               return ERR_PTR(ret);
> +               return NULL;
> +       } else if (ret == 0) {
> +               dev_err(lt9611uxc->dev, "wait for EDID timeout\n");
> +               return NULL;
>         }
>
>         return drm_do_get_edid(connector, lt9611uxc_get_edid_block, lt9611uxc);
> --
> 2.29.2
>


-- 
With best wishes
Dmitry