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drm/meson: fix 1px pink line on GXM when scaling video overlay
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: bbbe775ec5
("drm: Add support for Amlogic Meson Graphic Controller")
Suggested-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230303123312.155164-1-christianshewitt@gmail.com
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@ -100,6 +100,8 @@ void meson_vpp_init(struct meson_drm *priv)
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priv->io_base + _REG(VPP_DOLBY_CTRL));
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writel_relaxed(0x1020080,
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priv->io_base + _REG(VPP_DUMMY_DATA1));
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writel_relaxed(0x42020,
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priv->io_base + _REG(VPP_DUMMY_DATA));
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} else if (meson_vpu_is_compatible(priv, VPU_COMPATIBLE_G12A))
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writel_relaxed(0xf, priv->io_base + _REG(DOLBY_PATH_CTRL));
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