disp: msm: add inverted display brightness value property

In general the brightness value, the first parameter is low byte and
the second is high byte, but some DDIC invert, so add inverted display
brightness value property.

Change-Id: I8bf5631bb66096bd28529c53643e358afffce18e
Signed-off-by: Wenjun Zhang <[email protected]>

msm/dsi/dsi_panel.c

@@ -506,6 +506,9 @@ static int dsi_panel_update_backlight(struct dsi_panel *panel,
 
 	dsi = &panel->mipi_device;
 
+	if (panel->bl_config.bl_inverted_dbv)
+		bl_lvl = (((bl_lvl & 0xff) << 8) | (bl_lvl >> 8));
+
 	rc = mipi_dsi_dcs_set_display_brightness(dsi, bl_lvl);
 	if (rc < 0)
 		DSI_ERR("failed to update dcs backlight:%d\n", bl_lvl);
@@ -2183,6 +2186,9 @@ static int dsi_panel_parse_bl_config(struct dsi_panel *panel)
 		panel->bl_config.brightness_max_level = val;
 	}
 
+	panel->bl_config.bl_inverted_dbv = utils->read_bool(utils->data,
+		"qcom,mdss-dsi-bl-inverted-dbv");
+
 	if (panel->bl_config.type == DSI_BACKLIGHT_PWM) {
 		rc = dsi_panel_parse_bl_pwm_config(panel);
 		if (rc) {

msm/dsi/dsi_panel.h

@@ -115,6 +115,7 @@ struct dsi_backlight_config {
 	u32 bl_level;
 	u32 bl_scale;
 	u32 bl_scale_sv;
+	bool bl_inverted_dbv;
 
 	int en_gpio;
 	/* PWM params */