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| author | SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com> | 2019-06-14 15:04:00 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-16 10:11:01 +0200 |
| commit | 26341f1139404362785132fe9ce7f3dc86a85992 (patch) | |
| tree | 07d3343664582ee078a25d6f6b60d4f41293ccdf /drivers/gpu/drm/amd | |
| parent | 98d0152c2da000d48d78458874abf259a80d0c4c (diff) | |
| download | linux-stable-26341f1139404362785132fe9ce7f3dc86a85992.tar.gz linux-stable-26341f1139404362785132fe9ce7f3dc86a85992.tar.bz2 linux-stable-26341f1139404362785132fe9ce7f3dc86a85992.zip | |
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>
Diffstat (limited to 'drivers/gpu/drm/amd')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dce_abm.c | 4 |
1 files changed, 4 insertions, 0 deletions
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 2959c3c9390b..da30ae04e82b 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c @@ -234,6 +234,10 @@ 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) |