From c7990daebe71d11a9e360b5c3b0ecd1846a3a4bb Mon Sep 17 00:00:00 2001
From: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com>
Date: Fri, 14 Jun 2019 15:04:00 -0400
Subject: [PATCH] drm/amd/display: Wait for backlight programming completion in set backlight level
Git-commit: c7990daebe71d11a9e360b5c3b0ecd1846a3a4bb
Patch-mainline: v5.3-rc2
References: bsc#1111666
[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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/gpu/drm/amd/display/dc/dce/dce_abm.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
@@ -242,6 +242,10 @@ static void dmcu_set_backlight_level(
s2 |= (level << 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)