drm/bridge: lt9611: Consolidate detection logic

This patch simply consolidates the duplicated detection
functionality in the driver.

Cc: Yongqin Liu <yongqin.liu@linaro.org>
Cc: Amit Pundir <amit.pundir@linaro.org>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: kernel-team@android.com
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: John Stultz <jstultz@google.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20220511012612.3297577-1-jstultz@google.com

drivers/gpu/drm/bridge/lontium-lt9611.c

@@ -578,10 +578,8 @@ static struct lt9611_mode *lt9611_find_mode(const struct drm_display_mode *mode)
 }
 
 /* connector funcs */
-static enum drm_connector_status
-lt9611_connector_detect(struct drm_connector *connector, bool force)
+static enum drm_connector_status __lt9611_detect(struct lt9611 *lt9611)
 {
-	struct lt9611 *lt9611 = connector_to_lt9611(connector);
 	unsigned int reg_val = 0;
 	int connected = 0;
 
@@ -594,6 +592,12 @@ lt9611_connector_detect(struct drm_connector *connector, bool force)
 	return lt9611->status;
 }
 
+static enum drm_connector_status
+lt9611_connector_detect(struct drm_connector *connector, bool force)
+{
+	return __lt9611_detect(connector_to_lt9611(connector));
+}
+
 static int lt9611_read_edid(struct lt9611 *lt9611)
 {
 	unsigned int temp;
@@ -893,17 +897,7 @@ static void lt9611_bridge_mode_set(struct drm_bridge *bridge,
 
 static enum drm_connector_status lt9611_bridge_detect(struct drm_bridge *bridge)
 {
-	struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
-	unsigned int reg_val = 0;
-	int connected;
-
-	regmap_read(lt9611->regmap, 0x825e, &reg_val);
-	connected  = reg_val & BIT(0);
-
-	lt9611->status = connected ?  connector_status_connected :
-				connector_status_disconnected;
-
-	return lt9611->status;
+	return __lt9611_detect(bridge_to_lt9611(bridge));
 }
 
 static struct edid *lt9611_bridge_get_edid(struct drm_bridge *bridge,