linux-kernel - Re: [PATCH] drm/bridge: lt9611uxc: Increase EDID wait time from 500ms to 1000ms

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Message-ID: <a7d6d4dd-2a2e-42e3-ac47-bdd781a5443c@linaro.org>
Date: Mon, 24 Nov 2025 17:57:47 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Gopi Botlagunta <venkata.botlagunta@....qualcomm.com>,
 Andrzej Hajda <andrzej.hajda@...el.com>, Robert Foss <rfoss@...nel.org>,
 Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
 Jonas Karlman <jonas@...boo.se>, Jernej Skrabec <jernej.skrabec@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 venkata.valluru@....qualcomm.com, jessica.zhang@....qualcomm.com
Subject: Re: [PATCH] drm/bridge: lt9611uxc: Increase EDID wait time from 500ms
 to 1000ms

On 11/21/25 14:42, Gopi Botlagunta wrote:
> EDID interrupt was coming 600-650 ms after HPD interrupt, resulting
> into EDID read timeout and default resolution of 1024x768 on display.

This is king of vague, can you be more explicit on this issue ? which firmware ?
which display ? which HW setup ?

Any fixes tag ?

Neil

> 
> Signed-off-by: Gopi Botlagunta <venkata.botlagunta@....qualcomm.com>
> ---
>   drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> index 38fb8776c0f4..6f2b72fba598 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> @@ -382,7 +382,7 @@ lt9611uxc_bridge_detect(struct drm_bridge *bridge, struct drm_connector *connect
>   static int lt9611uxc_wait_for_edid(struct lt9611uxc *lt9611uxc)
>   {
>   	return wait_event_interruptible_timeout(lt9611uxc->wq, lt9611uxc->edid_read,
> -			msecs_to_jiffies(500));
> +			msecs_to_jiffies(1000));
>   }
>   
>   static int lt9611uxc_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
> 
> ---
> base-commit: 3c3d81183061b9e49dd3207fbbbc36314744bf3f
> change-id: 20251121-hdmibridge-e012bfeed3c3
> 
> Best regards,