Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.19 07/42] drm/amd/display: Wait for backlight programming completion in set backlight level | Date | Fri, 2 Aug 2019 09:22:27 -0400 |
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From: SivapiriyanKumarasamy <sivapiriyan.kumarasamy@amd.com>
[ 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> --- 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 070ab56a8aca7..da8b198538e5f 100644 --- 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) -- 2.20.1
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