[PATCH 6/7] drm/i915/backlight: Setup NITS based brightness via VESA

[Suraj Kandpal <suraj.kandpal@xxxxxxxxx>]

Modify backlight setup function for VESA interface to take into
account the NITS based brightness.

Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
---
 .../drm/i915/display/intel_dp_aux_backlight.c | 97 +++++++++++--------
 1 file changed, 57 insertions(+), 40 deletions(-)

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 d794397656dd..d42f9a78a32b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -559,56 +559,73 @@ static void intel_dp_aux_vesa_disable_backlight(const struct drm_connector_state
 static int intel_dp_aux_vesa_setup_backlight(struct intel_connector *connector, enum pipe pipe)
 {
 	struct intel_display *display = to_intel_display(connector);
+	struct drm_luminance_range_info *luminance_range =
+		&connector->base.display_info.luminance_range;
 	struct intel_dp *intel_dp = intel_attached_dp(connector);
 	struct intel_panel *panel = &connector->panel;
 	u16 current_level;
 	u8 current_mode;
 	int ret;
 
-	ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info,
-				     panel->vbt.backlight.pwm_freq_hz, intel_dp->edp_dpcd,
-				     &current_level, &current_mode);
-	if (ret < 0)
-		return ret;
-
-	drm_dbg_kms(display->drm,
-		    "[CONNECTOR:%d:%s] AUX VESA backlight enable is controlled through %s\n",
-		    connector->base.base.id, connector->base.name,
-		    dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_enable));
-	drm_dbg_kms(display->drm,
-		    "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled through %s\n",
-		    connector->base.base.id, connector->base.name,
-		    dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set));
-
-	if (!panel->backlight.edp.vesa.info.aux_set || !panel->backlight.edp.vesa.info.aux_enable) {
-		ret = panel->backlight.pwm_funcs->setup(connector, pipe);
-		if (ret < 0) {
-			drm_err(display->drm,
-				"[CONNECTOR:%d:%s] Failed to setup PWM backlight controls for eDP backlight: %d\n",
-				connector->base.base.id, connector->base.name, ret);
-			return ret;
-		}
-	}
-
-	if (panel->backlight.edp.vesa.info.aux_set) {
-		panel->backlight.max = panel->backlight.edp.vesa.info.max;
-		panel->backlight.min = 0;
-		if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
-			panel->backlight.level = current_level;
-			panel->backlight.enabled = panel->backlight.level != 0;
+	if (panel->backlight.edp.vesa.nits_support) {
+		if (luminance_range->max_luminance) {
+			panel->backlight.max = luminance_range->max_luminance;
+			panel->backlight.min = luminance_range->min_luminance;
 		} else {
-			panel->backlight.level = panel->backlight.max;
-			panel->backlight.enabled = false;
+			panel->backlight.max = 512;
+			panel->backlight.min = 0;
 		}
+		panel->backlight.level = intel_dp_aux_vesa_get_backlight(connector, 0);
+		panel->backlight.enabled = panel->backlight.level != 0;
+		drm_dbg_kms(display->drm,
+			    "[CONNECTOR:%d:%s] AUX VESA Nits backlight level is controlled through DPCD\n",
+			    connector->base.base.id, connector->base.name);
 	} else {
-		panel->backlight.max = panel->backlight.pwm_level_max;
-		panel->backlight.min = panel->backlight.pwm_level_min;
-		if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {
-			panel->backlight.level = panel->backlight.pwm_funcs->get(connector, pipe);
-			panel->backlight.enabled = panel->backlight.pwm_enabled;
+		ret = drm_edp_backlight_init(&intel_dp->aux, &panel->backlight.edp.vesa.info,
+					     panel->vbt.backlight.pwm_freq_hz, intel_dp->edp_dpcd,
+					     &current_level, &current_mode);
+		if (ret < 0)
+			return ret;
+
+		drm_dbg_kms(display->drm,
+			    "[CONNECTOR:%d:%s] AUX VESA backlight enable is controlled through %s\n",
+			    connector->base.base.id, connector->base.name,
+			    dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_enable));
+		drm_dbg_kms(display->drm,
+			    "[CONNECTOR:%d:%s] AUX VESA backlight level is controlled through %s\n",
+			    connector->base.base.id, connector->base.name,
+			    dpcd_vs_pwm_str(panel->backlight.edp.vesa.info.aux_set));
+
+		if (!panel->backlight.edp.vesa.info.aux_set || !panel->backlight.edp.vesa.info.aux_enable) {
+			ret = panel->backlight.pwm_funcs->setup(connector, pipe);
+			if (ret < 0) {
+				drm_err(display->drm,
+					"[CONNECTOR:%d:%s] Failed to setup PWM backlight controls for eDP backlight: %d\n",
+					connector->base.base.id, connector->base.name, ret);
+				return ret;
+			}
+		}
+
+		if (panel->backlight.edp.vesa.info.aux_set) {
+			panel->backlight.max = panel->backlight.edp.vesa.info.max;
+			panel->backlight.min = 0;
+			if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
+				panel->backlight.level = current_level;
+				panel->backlight.enabled = panel->backlight.level != 0;
+			} else {
+				panel->backlight.level = panel->backlight.max;
+				panel->backlight.enabled = false;
+			}
 		} else {
-			panel->backlight.level = panel->backlight.max;
-			panel->backlight.enabled = false;
+			panel->backlight.max = panel->backlight.pwm_level_max;
+			panel->backlight.min = panel->backlight.pwm_level_min;
+			if (current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_PWM) {
+				panel->backlight.level = panel->backlight.pwm_funcs->get(connector, pipe);
+				panel->backlight.enabled = panel->backlight.pwm_enabled;
+			} else {
+				panel->backlight.level = panel->backlight.max;
+				panel->backlight.enabled = false;
+			}
 		}
 	}
 
-- 
2.34.1