Commit 31e93364 authored Dec 14, 2018 by Beomho Seo Committed by Greg Kroah-Hartman Dec 17, 2018

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



Commit 391f93f2 ("serial: core: Rework hw-assited flow control support")
has changed the way the autoCTS mode is handled.

According 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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 778ec49c

drivers/tty/serial/samsung.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1365,11 +1365,14 @@ 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;
		}

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