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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>
This commit is contained in:
Anthony Koo 2018-10-18 15:03:56 -04:00 committed by Alex Deucher
parent f41a895026
commit ba45df4cb7
2 changed files with 13 additions and 0 deletions
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12
drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
View File

@ -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
};

1
drivers/gpu/drm/amd/display/dc/inc/hw/abm.h
View File

@ -58,6 +58,7 @@ struct abm_funcs {
bool use_smooth_brightness);
unsigned int (*get_current_backlight)(struct abm *abm);
unsigned int (*get_target_backlight)(struct abm *abm);
};
#endif