[PATCH v2] drm/meson: fix 1px pink line on GXM when scaling video overlay

[Martin Blumenstingl]

On Fri, Mar 3, 2023 at 1:33 PM Christian Hewitt
<christianshewitt at gmail.com> wrote:
>
> Playing media with a resolution smaller than the crtc size requires the
> video overlay to be scaled for output and GXM boards display a 1px pink
> line on the bottom of the scaled overlay. Comparing with the downstream
> vendor driver revealed VPP_DUMMY_DATA not being set [0].
>
> Setting VPP_DUMMY_DATA prevents the 1px pink line from being seen.
>
> [0] https://github.com/endlessm/linux-s905x/blob/master/drivers/amlogic/amports/video.c#L7869
>
> Fixes: bbbe775ec5b5 ("drm: Add support for Amlogic Meson Graphic Controller")
> Suggested-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>
> Signed-off-by: Christian Hewitt <christianshewitt at gmail.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl at googlemail.com>

> ---
> Change since v1:
> This time I sent the right patch from the correct branch; the wording in
> v1 is incorrect and the change to meson_registers.h is not required.
Thanks Christian - I was about to ask whether you could isolate which
part of the original patch fixes the issue, but you've been quicker
:-)