Enable nits based luminance by writing the PANEL_LUMINANCE_CONTROL
bit and set the correct register to change brightness.
Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
Tested-by: Ben Kao <ben.kao@xxxxxxxxx>
---
.../gpu/drm/i915/display/intel_dp_aux_backlight.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index 38e2b8cc591c..a090f1fca66e 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -527,6 +527,18 @@ intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
+ int ret;
+
+ if (panel->backlight.edp.vesa.luminance_control_support) {
+ ret = drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER,
+ DP_EDP_PANEL_LUMINANCE_CONTROL_ENABLE);
+
+ if (ret == 1)
+ return;
+
+ if (!intel_dp_aux_vesa_set_luminance(connector, level))
+ return;
+ }
if (!panel->backlight.edp.vesa.info.aux_enable) {
u32 pwm_level;
@@ -550,6 +562,9 @@ static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state
struct intel_panel *panel = &connector->panel;
struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
+ if (panel->backlight.edp.vesa.luminance_control_support)
+ return;
+
drm_edp_backlight_disable(&intel_dp->aux, &panel->backlight.edp.vesa.info);
if (!panel->backlight.edp.vesa.info.aux_enable)
--
2.34.1
