[PATCH v2 1/3] drm/bridge/lontium-lt9611uxc: fix waiting for EDID to become available

[Bjorn Andersson]

On Fri 15 Jan 05:02 CST 2021, Dmitry Baryshkov 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.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson at linaro.org>

Regards,
Bjorn

> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov at linaro.org>
> Fixes: 0cbbd5b1a012 ("drm: bridge: add support for lontium LT9611UXC bridge")
> ---
>  drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> index 0c98d27f84ac..a59e811f1705 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)
> -- 
> 2.29.2
>