linux-kernel - Re: [PATCH v2 1/3] drm/panel: visionox-rm69299: Fix clock frequency for SHIFT6mq

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Message-ID: <ba7y3qcuzkx7hinxraimuem6xnrrfxbj3giz56nq5qbmg76uno@kr6dezsumy2s>
Date: Sat, 6 Sep 2025 22:08:35 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Guido Günther <agx@...xcpu.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>,
        Jessica Zhang <jessica.zhang@....qualcomm.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,
        phone-devel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] drm/panel: visionox-rm69299: Fix clock frequency
 for SHIFT6mq

On Sat, Sep 06, 2025 at 05:17:25PM +0200, Guido Günther wrote:
> Make the clock frequency match what the sdm845 downstream kernel
> uses. Otherwise the panel stays black.
> 
> Fixes: 783334f366b18 ("drm/panel: visionox-rm69299: support the variant found in the SHIFT6mq")
> Signed-off-by: Guido Günther <agx@...xcpu.org>
> Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/gpu/drm/panel/panel-visionox-rm69299.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-visionox-rm69299.c b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
> index 909c280eab1fb408a713d84051a1afbb252c45e8..e65697ce6f51c7d64b786da18cf44b16de5d6919 100644
> --- a/drivers/gpu/drm/panel/panel-visionox-rm69299.c
> +++ b/drivers/gpu/drm/panel/panel-visionox-rm69299.c
> @@ -247,7 +247,7 @@ static const struct drm_display_mode visionox_rm69299_1080x2248_60hz = {
>  };
>  
>  static const struct drm_display_mode visionox_rm69299_1080x2160_60hz = {
> -	.clock = 158695,
> +	.clock = 149360,

clock = (2160 + 8 + 4 + 4) * (1080 + 26 + 2 + 36) * 60 / 1000 ?

>  	.hdisplay = 1080,
>  	.hsync_start = 1080 + 26,
>  	.hsync_end = 1080 + 26 + 2,
> 
> -- 
> 2.51.0
> 

-- 
With best wishes
Dmitry