From: Beomho Seo <beomho.seo@samsung.com>
Date: Wed, 4 Mar 2015 06:34:47 +0000 (+0900)
Subject: tty: serial: samsung: Properly set flags in autoCTS mode
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d1c1787e868d8c7c2ccd5af810c79ef0039d45ef;p=platform%2Fkernel%2Flinux-exynos.git

tty: serial: samsung: Properly set flags in autoCTS mode

Commit 391f93f2ec9f ("serial: core: Rework hw-assited flow control support")
has changed the way the autoCTS mode is handled.

Acordding to that change, serial drivers which enable H/W autoCTS mode must
set UPSTAT_AUTOCTS to prevent the serial core from inadvertently disabling
TX. This patch adds proper handling of UPSTAT_AUTOCTS flag.

Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
[mszyprow: rephrased commit message]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: I3e8aff35b048b4ece3dfa00e7347907e052e7e9a
---

diff --git a/drivers/tty/serial/samsung.c b/drivers/tty/serial/samsung.c
index 57baa84ccf86..f4b8e4e17a86 100644
--- a/drivers/tty/serial/samsung.c
+++ b/drivers/tty/serial/samsung.c
@@ -1343,11 +1343,14 @@ static void s3c24xx_serial_set_termios(struct uart_port *port,
 	wr_regl(port, S3C2410_ULCON, ulcon);
 	wr_regl(port, S3C2410_UBRDIV, quot);
 
+	port->status &= ~UPSTAT_AUTOCTS;
+
 	umcon = rd_regl(port, S3C2410_UMCON);
 	if (termios->c_cflag & CRTSCTS) {
 		umcon |= S3C2410_UMCOM_AFC;
 		/* Disable RTS when RX FIFO contains 63 bytes */
 		umcon &= ~S3C2412_UMCON_AFC_8;
+		port->status = UPSTAT_AUTOCTS;
 	} else {
 		umcon &= ~S3C2410_UMCOM_AFC;
 	}