From 5459b384f2b8b39d5680bcdab7e99bc39afa194c Mon Sep 17 00:00:00 2001
From: Philip Cuadra <philipcuadra@google.com>
Date: Mon, 12 Jun 2017 15:47:19 -0700
Subject: [PATCH] msm_serial_hs: make the Bluetooth tty thread RT

For Bluetooth, the tty kthread should be RT in order to avoid scheduling
delays.

Bug: 36106419
Test: play bluetooth audio, verify tty kthread runs at RT via systrace
Change-Id: I441dd10d22f8831d055166bcd1ff9f01e5ca13d4
Signed-off-by: Philip Cuadra <philipcuadra@google.com>
---
 drivers/tty/serial/msm_serial_hs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/msm_serial_hs.c b/drivers/tty/serial/msm_serial_hs.c
index 844c7617b9e6..fd191761bfa1 100644
--- a/drivers/tty/serial/msm_serial_hs.c
+++ b/drivers/tty/serial/msm_serial_hs.c
@@ -62,6 +62,7 @@
 #include <linux/ipc_logging.h>
 #include <asm/irq.h>
 #include <linux/kthread.h>
+#include <uapi/linux/sched.h>
 
 #include <linux/msm-sps.h>
 #include <linux/platform_data/msm_serial_hs.h>
@@ -3394,6 +3395,7 @@ static void  msm_serial_hs_rt_init(struct uart_port *uport)
 	msm_uport->pm_state = MSM_HS_PM_SUSPENDED;
 	mutex_unlock(&msm_uport->mtx);
 	pm_runtime_enable(uport->dev);
+	tty_port_set_policy(&uport->state->port, SCHED_FIFO, 1);
 }
 
 static int msm_hs_runtime_suspend(struct device *dev)