disp: msm: sde: check correct field for XIN idle status

Current code is checking the HALT_ACK instead of HALT_IDLE
fields which leads to unnecessarily issuing halt requests
on ports that are already idle.

Change-Id: I2269ce6364dab3bb8a52a0fb1b1e68e9b92b6444
Signed-off-by: Steve Cohen <[email protected]>

msm/sde/sde_hw_vbif.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2015-2019, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2015-2020, The Linux Foundation. All rights reserved.
  */
 
 #include "sde_hwio.h"
@@ -178,7 +178,7 @@ static bool sde_hw_get_halt_ctrl(struct sde_hw_vbif *vbif,
 
 	reg_val = SDE_REG_READ(c, VBIF_XIN_HALT_CTRL1);
 
-	return (reg_val & BIT(xin_id)) ? true : false;
+	return ((reg_val >> 16) & BIT(xin_id)) ? true : false;
 }
 
 static void sde_hw_set_qos_remap(struct sde_hw_vbif *vbif,