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
