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Date: Wed, 9 Mar 2022 13:56:02 +0100 From: Geert Uytterhoeven <geert@...ux-m68k.org> To: Chen-Yu Tsai <wens@...nel.org> Cc: Javier Martinez Canillas <javierm@...hat.com>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>, Chen-Yu Tsai <wens@...e.org>, DRI Development <dri-devel@...ts.freedesktop.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 1/2] drm: ssd130x: Fix COM scan direction register mask On Wed, Mar 9, 2022 at 2:57 AM Chen-Yu Tsai <wens@...nel.org> 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. > > Fixes: a61732e80867 ("drm: Add driver for Solomon SSD130x OLED displays") > Signed-off-by: Chen-Yu Tsai <wens@...e.org> Thanks, this fixes the vertically-mirrored display on my Adafruit FeatherWing 128x32 OLED. Tested-by: Geert Uytterhoeven <geert@...ux-m68k.org> Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org> Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org 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
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