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

[Geert Uytterhoeven]

On Wed, Mar 9, 2022 at 2:57 AM Chen-Yu Tsai <wens@xxxxxxxxxx> wrote:
> From: Chen-Yu Tsai <wens@xxxxxxxx>
>
> 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.
>
> Fixes: a61732e80867 ("drm: Add driver for Solomon SSD130x OLED displays")
> Signed-off-by: Chen-Yu Tsai <wens@xxxxxxxx>

Thanks, this fixes the vertically-mirrored display on my Adafruit
FeatherWing 128x32 OLED.
Tested-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds