linux-kernel - Re: [PATCH v2] drm/panel: simple: Fix Innolux G156HCE-L01 LVDS clock

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Message-ID: <549974ea-0d27-4797-aba1-1dbe62fc9df4@linaro.org>
Date:   Mon, 14 Aug 2023 15:45:12 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Luca Ceresoli <luca.ceresoli@...tlin.com>,
        dri-devel@...ts.freedesktop.org
Cc:     Sam Ravnborg <sam@...nborg.org>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Marek Vasut <marex@...x.de>,
        linux-kernel@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH v2] drm/panel: simple: Fix Innolux G156HCE-L01 LVDS clock

Hi,

On 14/08/2023 15:40, Luca Ceresoli wrote:
> This panel has been implemented in commit 225213f24c79 ("drm/panel-simple:
> Add Innolux G156HCE-L01 panel entry") with a higher clock than the typical
> one mentioned on the documentation to avoid flickering on the unit
> tested. Testing on a different unit shows that the panel actually works
> with the intended 70.93 MHz clock and even lower frequencies so the
> flickering is likely caused either by a defective unit or by other
> different components such as the bridge.
> 
> Fixes: eae7488814b5 ("drm/panel-simple: Add Innolux G156HCE-L01 panel entry")
> Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
> Tested-by: Marek Vasut <marex@...x.de> # MX8MM with LT9211
> Reviewed-by: Marek Vasut <marex@...x.de>
> 
> ---
> 
> Changed in v2:
>   - fix commit hash in "Fixes:" line
>   - add tested/reviewed by Marek
> ---
>   drivers/gpu/drm/panel/panel-simple.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 701013b3ad13..a1bbc7f11e83 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -2379,7 +2379,7 @@ static const struct panel_desc innolux_g121x1_l03 = {
>   };
>   
>   static const struct display_timing innolux_g156hce_l01_timings = {
> -	.pixelclock = { 120000000, 144000000, 150000000 },
> +	.pixelclock = { 120000000, 141860000, 150000000 },
>   	.hactive = { 1920, 1920, 1920 },
>   	.hfront_porch = { 80, 90, 100 },
>   	.hback_porch = { 80, 90, 100 },

I'll apply once drm-misc-next-fixes is aligned on the last drm-misc-next tag
for v6.6.

Thanks,
Neil