Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit bb2f861a authored by Fugang Duan's avatar Fugang Duan Committed by Greg Kroah-Hartman
Browse files

serial: imx: fix throttle/unthrottle callbacks for hardware assisted flow control 



when the 'CTSC' bit is negated. 'CTS' has no function when 'CTSC' is asserted.
0: The CTS pin is high (inactive)
1: The CTS pin is low (active)

For throttle, it needs to clear 'CTS' and 'CTSC' bits.
For unthrottle, it needs to enable 'CTS' and 'CTSC' bits.

The patch just fix the issue.

Signed-off-by: default avatarFugang Duan <B38611@freescale.com>
Signed-off-by: default avatarHuang Shijie <shijie8@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1ede7dcc

drivers/tty/serial/imx.c

+2 −4
Original line number Diff line number Diff line
@@ -817,11 +817,9 @@ static void imx_set_mctrl(struct uart_port *port, unsigned int mctrl) 
	struct imx_port *sport = (struct imx_port *)port;

	unsigned long temp;



	temp = readl(sport->port.membase + UCR2) & ~UCR2_CTS;



	temp = readl(sport->port.membase + UCR2) & ~(UCR2_CTS | UCR2_CTSC);

	if (mctrl & TIOCM_RTS)

		if (!sport->dma_is_enabled)

			temp |= UCR2_CTS;

		temp |= UCR2_CTS | UCR2_CTSC;



	writel(temp, sport->port.membase + UCR2);