From: Jung-Ick Guack <ji.guack@samsung.com>
Date: Tue, 14 Jun 2016 09:12:53 +0000 (+0900)
Subject: [COMMON] serial: samsung: Support in-band-wakeup
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a4cddbce51c5288e579c757397cbfc4c0f294088;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

[COMMON] serial: samsung: Support in-band-wakeup

'in band wakeup' is for enabling wakeup UART_BT
during sleep. CTS or RXD could be wakeup source.
RTS should be Low during sleep.

Change-Id: Ifa683ebad4676ba00513c4a7b699850cdf4c2c50
Signed-off-by: Jung-Ick Guack <ji.guack@samsung.com>
---

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 81b173b5ef6d..fc3d874c65c1 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -756,10 +756,12 @@ static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
 
 	switch (level) {
 	case S3C24XX_UART_PORT_SUSPEND:
-		/* disable auto flow control & set nRTS for High */
-		umcon = rd_regl(port, S3C2410_UMCON);
-		umcon &= ~(S3C2410_UMCOM_AFC | S3C2410_UMCOM_RTS_LOW);
-		wr_regl(port, S3C2410_UMCON, umcon);
+		if (!ourport->in_band_wakeup) {
+			/* disable auto flow control & set nRTS for High */
+			umcon = rd_regl(port, S3C2410_UMCON);
+			umcon &= ~(S3C2410_UMCOM_AFC | S3C2410_UMCOM_RTS_LOW);
+			wr_regl(port, S3C2410_UMCON, umcon);
+		}
 
 		uart_clock_disable(ourport);
 		break;
@@ -1620,6 +1622,10 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
 						PM_QOS_CLUSTER1_FREQ_MIN, 0);
 	}
 #endif
+	if (of_get_property(pdev->dev.of_node, "samsung,in-band-wakeup", NULL))
+		ourport->in_band_wakeup = 1;
+	else
+		ourport->in_band_wakeup = 0;
 
 	if (of_find_property(pdev->dev.of_node, "samsung,use-default-irq", NULL))
 		ourport->use_default_irq =1;
diff --git a/drivers/tty/serial/samsung.h b/drivers/tty/serial/samsung.h
index 789a1187a218..401f72ab0802 100644
--- a/drivers/tty/serial/samsung.h
+++ b/drivers/tty/serial/samsung.h
@@ -82,6 +82,7 @@ struct s3c24xx_uart_port {
 	struct pm_qos_request		s3c24xx_uart_cpu_qos;
 	struct delayed_work		qos_work;
 
+	unsigned int			in_band_wakeup;
 	unsigned int dbg_mode;
 };