sm7125: drm: msm: make Samsung HBM work

On stock ROM Samsung writes the brightness value for the finger mask to /sys/class/lcd/panel/mask_brightness and then turns on the mask layer. However we don't know how they actually turn it on. Therefore enable/disable the finger mask every time we write something to mask_brightness.

Signed-off-by: Simon1511 <simon2002.schoenmackers@gmail.com>
Change-Id: If14119b8856d329f6049701fd16d20c39301f712

drivers/gpu/drm/msm/samsung_lego/ss_dsi_panel_sysfs.c

@@ -4285,12 +4285,20 @@ static ssize_t ss_finger_hbm_store(struct device *dev,
 		return size;
 	}
 
-	if (sscanf(buf, "%d", &value) != 1)
-		return size;
+	sscanf(buf, "%d", &value);
 
 	LCD_INFO("mask_bl_level value : %d\n", value);
 	vdd->br_info.common_br.finger_mask_bl_level = value;
 
+	// brightness value > 0 means enabled
+	if (value > 0) {
+		vdd->finger_mask = 1;
+	} else {
+		vdd->finger_mask = 0;
+	}
+	// Update finger mask after turning on and off
+	vdd->finger_mask_updated = true;
+
 	return size;
 
 }

drivers/gpu/drm/msm/sde/sde_connector.c

@@ -645,11 +645,13 @@ int sde_connector_pre_kickoff(struct drm_connector *connector)
 		if (vdd->support_optical_fingerprint) {
 			finger_mask_state = sde_connector_get_property(c_conn->base.state,
 					CONNECTOR_PROP_FINGERPRINT_MASK);
-			vdd->finger_mask_updated = false;
-			if (finger_mask_state != vdd->finger_mask) {
-				vdd->finger_mask = finger_mask_state;
-				vdd->finger_mask_updated = true;
-				SDE_ERROR("[FINGER_MASK]updated finger mask mode %d\n", finger_mask_state);
+                       if (finger_mask_state == 0 && vdd->finger_mask == 1) {
+                               finger_mask_state = vdd->finger_mask;
+                               SDE_ERROR("[FINGER_MASK]updated finger mask mode %d\n", vdd->finger_mask);
+                       } else if (finger_mask_state == 1 && vdd->finger_mask == 0) {
+                               finger_mask_state = vdd->finger_mask;
+                               vdd->finger_mask_updated = false;
+                               SDE_ERROR("[FINGER_MASK]updated finger mask mode %d\n", vdd->finger_mask);
 			}
 		}
 	}