This is a note to let you know that I've just added the patch titled
drm/stm: ltdc: reset plane transparency after plane disable
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-stm-ltdc-reset-plane-transparency-after-plane-di.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit fa6b63c22b8561acc4eeba506820781dfff328d0
Author: Yannick Fertre <yannick.fertre@xxxxxxxxxxx>
Date: Fri Jul 12 15:13:44 2024 +0200
drm/stm: ltdc: reset plane transparency after plane disable
[ 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@xxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240712131344.98113-1-yannick.fertre@xxxxxxxxxxx
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@xxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 056642d12265c..0832b749b66e7 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -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,
