Pls ignore the patch. From: Fugang Duan <b38611@xxxxxxxxxxxxx> Sent: Friday, September 19, 2014 3:17 PM >To: gregkh@xxxxxxxxxxxxxxxxxxx >Cc: linux-serial@xxxxxxxxxxxxxxx; Duan Fugang-B38611 >Subject: [PATCH] serial: imx: fix throttle/unthrottle callbacks for >hardware assisted flow control > >From: Huang Shijie <b32955@xxxxxxxxxxxxx> > >From datasheet, UCR2[CTS] bit controls the 'CTS' bit and takes effort only >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: Fugang Duan <B38611@xxxxxxxxxxxxx> >--- > drivers/tty/serial/imx.c | 6 ++---- > 1 files changed, 2 insertions(+), 4 deletions(-) > >diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index >044e86d..070a37e 100644 >--- a/drivers/tty/serial/imx.c >+++ b/drivers/tty/serial/imx.c >@@ -823,11 +823,9 @@ 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); > >-- >1.7.8 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
