drm/amd/display: BL setting save/restore

Signed-off-by: Charlene Liu <charlene.liu@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 b48190f..b231bd5 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_abm.c
@@ -323,6 +323,15 @@ static bool dce_abm_immediate_disable(struct abm *abm)
        /* notifyDMCUMsg */
        REG_UPDATE(MASTER_COMM_CNTL_REG, MASTER_COMM_INTERRUPT, 1);
 
+       abm->stored_backlight_registers.BL_PWM_CNTL =
+               REG_READ(BL_PWM_CNTL);
+       abm->stored_backlight_registers.BL_PWM_CNTL2 =
+               REG_READ(BL_PWM_CNTL2);
+       abm->stored_backlight_registers.BL_PWM_PERIOD_CNTL =
+               REG_READ(BL_PWM_PERIOD_CNTL);
+
+       REG_GET(LVTMA_PWRSEQ_REF_DIV, BL_PWM_REF_DIV,
+               &abm->stored_backlight_registers.LVTMA_PWRSEQ_REF_DIV_BL_PWM_REF_DIV);
        return true;
 }