linux-kernel - Re: [PATCH] drm/bridge: lt9611uxc: extend mode valid checks

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Message-ID: <4vndrym4m7ql3lwbhqedukzcxb5qmtkyzaht66ps4fbjrvnwif@oqwnybnutx4h>
Date: Sat, 26 Jul 2025 19:06:10 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Nilesh Laad <nilesh.laad@....qualcomm.com>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        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>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        venkata.valluru@....qualcomm.com, jessica.zhang@....qualcomm.com
Subject: Re: [PATCH] drm/bridge: lt9611uxc: extend mode valid checks

On Fri, Jul 25, 2025 at 01:48:38PM +0530, Nilesh Laad wrote:
> Currently valid mode checks are only for hdisplay and vdisplay,
> add htotal and vtotal to filter only specific modes.

Why?

> 
> Signed-off-by: Nilesh Laad <nilesh.laad@....qualcomm.com>
> ---
>  drivers/gpu/drm/bridge/lontium-lt9611uxc.c | 36 +++++++++++++++++-------------
>  1 file changed, 20 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> index 38fb8776c0f4..cfe389b4c25c 100644
> --- a/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611uxc.c
> @@ -89,7 +89,9 @@ static const struct regmap_config lt9611uxc_regmap_config = {
>  
>  struct lt9611uxc_mode {
>  	u16 hdisplay;
> +	u16 htotal;
>  	u16 vdisplay;
> +	u16 vtotal;
>  	u8 vrefresh;
>  };
>  
> @@ -98,22 +100,22 @@ struct lt9611uxc_mode {
>   * Enumerate them here to check whether the mode is supported.
>   */
>  static struct lt9611uxc_mode lt9611uxc_modes[] = {
> -	{ 1920, 1080, 60 },
> -	{ 1920, 1080, 30 },
> -	{ 1920, 1080, 25 },
> -	{ 1366, 768, 60 },
> -	{ 1360, 768, 60 },
> -	{ 1280, 1024, 60 },
> -	{ 1280, 800, 60 },
> -	{ 1280, 720, 60 },
> -	{ 1280, 720, 50 },
> -	{ 1280, 720, 30 },
> -	{ 1152, 864, 60 },
> -	{ 1024, 768, 60 },
> -	{ 800, 600, 60 },
> -	{ 720, 576, 50 },
> -	{ 720, 480, 60 },
> -	{ 640, 480, 60 },
> +	{ 1920, 2200, 1080, 1125, 60 },
> +	{ 1920, 2200, 1080, 1125, 30 },
> +	{ 1920, 2640, 1080, 1125, 25 },
> +	{ 1366, 1792, 768, 798, 60 },
> +	{ 1360, 1792, 768, 795, 60 },
> +	{ 1280, 1688, 1024, 1066, 60 },
> +	{ 1280, 1680, 800, 831, 60 },
> +	{ 1280, 1650, 720, 750, 60 },
> +	{ 1280, 1980, 720, 750, 50 },
> +	{ 1280, 3300, 720, 750, 30 },
> +	{ 1152, 1600, 864, 900, 60 },
> +	{ 1024, 1344, 768, 806, 60 },
> +	{ 800, 1056, 600, 628, 60 },
> +	{ 720, 864, 576, 625, 50 },
> +	{ 720, 858, 480, 525, 60 },
> +	{ 640, 800, 480, 525, 60 },
>  };
>  
>  static struct lt9611uxc *bridge_to_lt9611uxc(struct drm_bridge *bridge)
> @@ -237,7 +239,9 @@ static struct lt9611uxc_mode *lt9611uxc_find_mode(const struct drm_display_mode
>  
>  	for (i = 0; i < ARRAY_SIZE(lt9611uxc_modes); i++) {
>  		if (lt9611uxc_modes[i].hdisplay == mode->hdisplay &&
> +		    lt9611uxc_modes[i].htotal == mode->htotal &&
>  		    lt9611uxc_modes[i].vdisplay == mode->vdisplay &&
> +		    lt9611uxc_modes[i].vtotal == mode->vtotal &&
>  		    lt9611uxc_modes[i].vrefresh == drm_mode_vrefresh(mode)) {
>  			return &lt9611uxc_modes[i];
>  		}
> 
> ---
> base-commit: e48123c607a0db8b9ad02f83c8c3d39918dbda06
> change-id: 20250725-lt9611uxc-modes-d59bd4d49442
> 
> Best regards,
> --  
> Nilesh Laad <nilesh.laad@....qualcomm.com>
> 

-- 
With best wishes
Dmitry