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-rw-r--r--meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/3039-drm-amd-display-Wait-for-backlight-programming-compl.patch39
1 files changed, 39 insertions, 0 deletions
diff --git a/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/3039-drm-amd-display-Wait-for-backlight-programming-compl.patch b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/3039-drm-amd-display-Wait-for-backlight-programming-compl.patch
new file mode 100644
index 00000000..af5e9ef7
--- /dev/null
+++ b/meta-amd-bsp/recipes-kernel/linux/linux-yocto-4.19.8/3039-drm-amd-display-Wait-for-backlight-programming-compl.patch
@@ -0,0 +1,39 @@
+From 6ec47858f376996e075c44a3f8295366840bfb78 Mon Sep 17 00:00:00 2001
+From: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com>
+Date: Fri, 14 Jun 2019 15:04:00 -0400
+Subject: [PATCH 3039/4256] drm/amd/display: Wait for backlight programming
+ completion in set backlight level
+
+[WHY]
+Currently we don't wait for blacklight programming completion in DMCU
+when setting backlight level. Some sequences such as PSR static screen
+event trigger reprogramming requires it to be complete.
+
+[How]
+Add generic wait for dmcu command completion in set backlight level.
+
+Signed-off-by: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com>
+Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
+Acked-by: Leo Li <sunpeng.li@amd.com>
+---
+ drivers/gpu/drm/amd/display/dc/dce/dce_abm.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c b/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
+index 3d87a8800300..adde7a5760bc 100644
+--- a/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
++++ b/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
+@@ -237,6 +237,10 @@ static void dmcu_set_backlight_level(
+ s2 |= (backlight_8_bit << ATOM_S2_CURRENT_BL_LEVEL_SHIFT);
+
+ REG_WRITE(BIOS_SCRATCH_2, s2);
++
++ /* waitDMCUReadyForCmd */
++ REG_WAIT(MASTER_COMM_CNTL_REG, MASTER_COMM_INTERRUPT,
++ 0, 1, 80000);
+ }
+
+ static void dce_abm_init(struct abm *abm)
+--
+2.17.1
+