diff options
| author | Anthony Koo <Anthony.Koo@amd.com> | 2018-10-18 22:03:56 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2018-11-05 22:21:43 +0300 |
| commit | ba45df4cb7193570e9fa4979b198ec313899417c (patch) | |
| tree | 638df0381cdd3dc7d835443959772017736572bd /drivers/gpu/drm/amd/display/dc/dce/dce_abm.c | |
| parent | f41a895026b8cb6f765190de7d2e7bc3ccbbd183 (diff) | |
| download | linux-ba45df4cb7193570e9fa4979b198ec313899417c.tar.xz | |
drm/amd/display: Expose target backlight level
[Why]
DM may want to understand any backlight optimizations
applied, so DM needs a way to query from the HW both
the real current backlight, which may be value during
transition.
And also target backlight, which may be after some
backlight optimizations applied.
[How]
Add interface to query current and target backlight levels
Target level may indicate backlight level after backlight
optimization and reductions are applied.
Signed-off-by: Anthony Koo <Anthony.Koo@amd.com>
Reviewed-by: Krunoslav Kovac <Krunoslav.Kovac@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/dce/dce_abm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/dce/dce_abm.c | 12 |
1 files changed, 12 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 e9765bb38a8b..2a342eae80fd 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c @@ -276,6 +276,17 @@ static unsigned int dce_abm_get_current_backlight(struct abm *abm) return backlight; } +static unsigned int dce_abm_get_target_backlight(struct abm *abm) +{ + struct dce_abm *abm_dce = TO_DCE_ABM(abm); + unsigned int backlight = REG_READ(BL1_PWM_TARGET_ABM_LEVEL); + + /* return backlight in hardware format which is unsigned 17 bits, with + * 1 bit integer and 16 bit fractional + */ + return backlight; +} + static bool dce_abm_set_level(struct abm *abm, uint32_t level) { struct dce_abm *abm_dce = TO_DCE_ABM(abm); @@ -410,6 +421,7 @@ static const struct abm_funcs dce_funcs = { .init_backlight = dce_abm_init_backlight, .set_backlight_level_pwm = dce_abm_set_backlight_level_pwm, .get_current_backlight = dce_abm_get_current_backlight, + .get_target_backlight = dce_abm_get_target_backlight, .set_abm_immediate_disable = dce_abm_immediate_disable }; |