drm/amd/display: Don't check registers, if using AUX BL control

[Why]
Currently the driver looks DCN registers to access if BL is on or not.
This check is not valid if we are using AUX based brightness control.
This causes driver to not send out "backlight off" command during power off
sequence as it already thinks it is off.

[How]
Only check DCN registers if we aren't using AUX based brightness control.

Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Swapnil Patel <swapnil.patel@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
index 602fb149dc1053ebe739e18f69611a9eb1f8c06d..31454db00ed55abd6a87427262be61f52ea466ea 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_hw_sequencer.c
@@ -964,7 +964,9 @@ void dce110_edp_backlight_control(
                return;
        }
 
-       if (link->panel_cntl) {
+       if (link->panel_cntl && !(link->dpcd_sink_ext_caps.bits.oled ||
+               link->dpcd_sink_ext_caps.bits.hdr_aux_backlight_control == 1 ||
+               link->dpcd_sink_ext_caps.bits.sdr_aux_backlight_control == 1)) {
                bool is_backlight_on = link->panel_cntl->funcs->is_panel_backlight_on(link->panel_cntl);
 
                if ((enable && is_backlight_on) || (!enable && !is_backlight_on)) {