linux-kernel - Re: [PATCH 1/2] drm: ssd130x: Fix COM scan direction register mask

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Date:   Tue, 8 Mar 2022 21:26:47 +0100
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     Chen-Yu Tsai <wens@...nel.org>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Cc:     Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 1/2] drm: ssd130x: Fix COM scan direction register mask

Hello Chen-Yu,

Thanks a lot for your patch.

On 3/8/22 17:07, Chen-Yu Tsai wrote:
> From: Chen-Yu Tsai <wens@...e.org>
> 
> The SSD130x's command to toggle COM scan direction uses bit 3 and only
> bit 3 to set the direction of the scanout. The driver has an incorrect
> GENMASK(3, 2), causing the setting to be set on bit 2, rendering it
> ineffective.
> 
> Fix the mask to only bit 3, so that the requested setting is applied
> correctly.
>

Sigh, you are correct. I thought that triple checked the datasheet
when writing this but I got it wrong anyways...
 
> Fixes: a61732e80867 ("drm: Add driver for Solomon SSD130x OLED displays")
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---

Acked-by: Javier Martinez Canillas <javierm@...hat.com>

-- 
Best regards,

Javier Martinez Canillas
Linux Engineering
Red Hat