Commit 2a5e21ad authored Jun 14, 2019 by SivapiriyanKumarasamy Committed by Greg Kroah-Hartman Aug 16, 2019

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



[ Upstream commit c7990daebe71d11a9e360b5c3b0ecd1846a3a4bb ]

[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>

parent 056af94d

drivers/gpu/drm/amd/display/dc/dce/dce_abm.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -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)