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drm/amd/display: Wait for backlight programming completion in set backlight level

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[ Upstream commit c7990daebe ]

[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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
SivapiriyanKumarasamy
2019-06-14 15:04:00 -04:00
committed by Greg Kroah-Hartman
parent 056af94d6e
commit 2a5e21adc7
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
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@@ -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)