From 8ffbf2f5cf8dc68d1cc43e8fba6e43d1f7b866f9 Mon Sep 17 00:00:00 2001
From: Yannick Fertre <yannick.fertre@foss.st.com>
Date: Fri, 3 Jun 2022 15:41:51 +0200
Subject: drm/stm: ltdc: disable all layers before crtc shutdown
Git-commit: c4f218d46fafd709df8e03c275c4d4ad6ebed019
Patch-mainline: v6.0-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225 jsc#PED-2849
All plans must be disabled before the CRTC shutdown helping
the crtc to restart from a clean situation (without unwanted
planes already enable).
Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220603134151.591997-1-yannick.fertre@foss.st.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/stm/ltdc.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index 76230f775081..0de65be9cd65 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -790,11 +790,17 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
struct drm_device *ddev = crtc->dev;
+ int layer_index = 0;
DRM_DEBUG_DRIVER("\n");
drm_crtc_vblank_off(crtc);
+ /* Disable all layers */
+ for (layer_index = 0; layer_index < ldev->caps.nb_layers; layer_index++)
+ regmap_write_bits(ldev->regmap, LTDC_L1CR + layer_index * LAY_OFS,
+ LXCR_CLUTEN | LXCR_LEN, 0);
+
/* disable IRQ */
regmap_clear_bits(ldev->regmap, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
--
2.38.1