From: SivapiriyanKumarasamy <sivapiriyan.kumaras...@amd.com>
[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.kumaras...@amd.com>
Reviewed-by: Anthony Koo <anthony....@amd.com>
Acked-by: Leo Li <sunpeng...@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)
--
2.22.0
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