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| author | Harry Wentland <harry.wentland@amd.com> | 2021-08-16 15:57:12 -0400 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2021-09-14 15:57:10 -0400 |
| commit | 9e0d55ae545f4a8f4c00339ad97ee2ef9e8e06ff (patch) | |
| tree | 64d28d8ac508b6b5caef1d6cc32fb22b2e254896 /drivers/gpu/drm/amd/display/dc/irq/irq_service.c | |
| parent | 7b89bf83181363a84f86da787159ddbbef505b8c (diff) | |
| download | linux-9e0d55ae545f4a8f4c00339ad97ee2ef9e8e06ff.tar.gz linux-9e0d55ae545f4a8f4c00339ad97ee2ef9e8e06ff.tar.bz2 linux-9e0d55ae545f4a8f4c00339ad97ee2ef9e8e06ff.zip | |
drm/amd/display: Get backlight from PWM if DMCU is not initialized
On Carrizo/Stoney systems we set backlight through panel_cntl, i.e.
directly via the PWM registers, if DMCU is not initialized. We
always read it back through ABM registers which leads to a
mismatch and forces atomic_commit to program the backlight
each time.
Instead make sure we use the same logic for backlight readback,
i.e. read it from panel_cntl if DMCU is not initialized.
We also need to remove some extraneous and incorrect calculations
at the end of dce_get_16_bit_backlight_from_pwm.
Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1666
Cc: stable@vger.kernel.org
Reviewed-by: Josip Pavic <josip.pavic@amd.com>
Acked-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/irq/irq_service.c')
0 files changed, 0 insertions, 0 deletions