summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
diff options
context:
space:
mode:
authorAnthony Koo <Anthony.Koo@amd.com>2018-10-18 22:03:56 +0300
committerAlex Deucher <alexander.deucher@amd.com>2018-11-05 22:21:43 +0300
commitba45df4cb7193570e9fa4979b198ec313899417c (patch)
tree638df0381cdd3dc7d835443959772017736572bd /drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
parentf41a895026b8cb6f765190de7d2e7bc3ccbbd183 (diff)
downloadlinux-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.c12
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
};