drm/bridge: analogix_dp: move basic controller init into runtime PM

Make sure the controller is in a basic working state after runtime
resume. Keep the analog function enable in the mode set path as this
enables parts of the PHY that are only required to be powered when
there is a data stream being sent out.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240619182200.3752465-8-l.stach@pengutronix.de

drivers/gpu/drm/bridge/analogix/analogix_dp_core.c

@@ -41,10 +41,8 @@ struct bridge_init {
 	struct device_node *node;
 };
 
-static int analogix_dp_init_dp(struct analogix_dp_device *dp)
+static void analogix_dp_init_dp(struct analogix_dp_device *dp)
 {
-	int ret;
-
 	analogix_dp_reset(dp);
 
 	analogix_dp_swreset(dp);
@@ -56,13 +54,9 @@ static int analogix_dp_init_dp(struct analogix_dp_device *dp)
 	analogix_dp_enable_sw_function(dp);
 
 	analogix_dp_config_interrupt(dp);
-	ret = analogix_dp_init_analog_func(dp);
-	if (ret)
-		return ret;
 
 	analogix_dp_init_hpd(dp);
 	analogix_dp_init_aux(dp);
-	return 0;
 }
 
 static int analogix_dp_detect_hpd(struct analogix_dp_device *dp)
@@ -1251,9 +1245,9 @@ static int analogix_dp_set_bridge(struct analogix_dp_device *dp)
 
 	pm_runtime_get_sync(dp->dev);
 
-	ret = analogix_dp_init_dp(dp);
+	ret = analogix_dp_init_analog_func(dp);
 	if (ret)
-		goto out_dp_init;
+		return ret;
 
 	/*
 	 * According to DP spec v1.3 chap 3.5.1.2 Link Training,
@@ -1718,6 +1712,8 @@ int analogix_dp_resume(struct analogix_dp_device *dp)
 
 	phy_power_on(dp->phy);
 
+	analogix_dp_init_dp(dp);
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(analogix_dp_resume);