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drm/stm: ltdc: reset plane transparency after plane disable

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[ Upstream commit 02fa62d41c ]

The plane's opacity should be reseted while the plane
is disabled. It prevents from seeing a possible global
or layer background color set earlier.

Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240712131344.98113-1-yannick.fertre@foss.st.com
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yannick Fertre 2024-07-12 15:13:44 +02:00 committed by Greg Kroah-Hartman
parent 64f38c08b5
commit fb557a36b0
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/stm/ltdc.c
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@ -1513,6 +1513,9 @@ static void ltdc_plane_atomic_disable(struct drm_plane *plane,
/* Disable layer */
regmap_write_bits(ldev->regmap, LTDC_L1CR + lofs, LXCR_LEN | LXCR_CLUTEN | LXCR_HMEN, 0);
/* Reset the layer transparency to hide any related background color */
regmap_write_bits(ldev->regmap, LTDC_L1CACR + lofs, LXCACR_CONSTA, 0x00);
/* Commit shadow registers = update plane at next vblank */
if (ldev->caps.plane_reg_shadow)
regmap_write_bits(ldev->regmap, LTDC_L1RCR + lofs,