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

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BugLink: https://bugs.launchpad.net/bugs/2089884

[ Upstream commit 02fa62d41c8abff945bae5bfc3ddcf4721496aca ]

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>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Yannick Fertre
2024-07-12 15:13:44 +02:00
committed by Mehmet Basaran
parent d879efa057
commit ea5f30fc8d
1 changed files with 3 additions and 0 deletions
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drivers/gpu/drm/stm/ltdc.c
+3
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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,