drm: bridge: dw_hdmi: Fix ELD is not updated issue

The ELD (EDID-Like Data) is not updated when the HDMI cable
is plugged into different HDMI monitors.
This is because the EDID is not updated in the HDMI HPD function.
As a result, the ELD data remains unchanged and may not reflect
the capabilities of the newly connected HDMI sink device.

To address this issue, the handle_plugged_change function should move to
the bridge_atomic_enable and bridge_atomic_disable functions.
Make sure the EDID is properly updated before updating ELD.

Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230804061145.2824843-1-Sandor.yu@nxp.com

drivers/gpu/drm/bridge/synopsys/dw-hdmi.c

@@ -2449,15 +2449,7 @@ static enum drm_connector_status dw_hdmi_detect(struct dw_hdmi *hdmi)
 	enum drm_connector_status result;
 
 	result = hdmi->phy.ops->read_hpd(hdmi, hdmi->phy.data);
-
-	mutex_lock(&hdmi->mutex);
-	if (result != hdmi->last_connector_result) {
-		dev_dbg(hdmi->dev, "read_hpd result: %d", result);
-		handle_plugged_change(hdmi,
-				      result == connector_status_connected);
-		hdmi->last_connector_result = result;
-	}
-	mutex_unlock(&hdmi->mutex);
+	hdmi->last_connector_result = result;
 
 	return result;
 }
@@ -2958,6 +2950,7 @@ static void dw_hdmi_bridge_atomic_disable(struct drm_bridge *bridge,
 	hdmi->curr_conn = NULL;
 	dw_hdmi_update_power(hdmi);
 	dw_hdmi_update_phy_mask(hdmi);
+	handle_plugged_change(hdmi, false);
 	mutex_unlock(&hdmi->mutex);
 }
 
@@ -2976,6 +2969,7 @@ static void dw_hdmi_bridge_atomic_enable(struct drm_bridge *bridge,
 	hdmi->curr_conn = connector;
 	dw_hdmi_update_power(hdmi);
 	dw_hdmi_update_phy_mask(hdmi);
+	handle_plugged_change(hdmi, true);
 	mutex_unlock(&hdmi->mutex);
 }