Hi Greg,

On Friday, April 20, 2018 02:13 PM, Uwe Kleine-König wrote:

Hello Chris,

On Fri, Apr 20, 2018 at 09:07:59AM +0800, Chris Ruehl wrote:

quoted

Fix a problem introduced with
commit e61c38d85b73 ("serial: imx: setup DCEDTE early and ensure DCD and RI irqs to be off")
result in non dte-mode imx-uart fail receive data.
By add back IMX21_UCR3_RXDMUXSEL the serial port works as expected.

Signed-off-by: Chris Ruehl <redacted>
---
  drivers/tty/serial/imx.c | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 91f3a1a..3d09933 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c

@@ -1391,7 +1391,7 @@ static int imx_uart_startup(struct uart_port *port)
  
  		ucr3 = imx_uart_readl(sport, UCR3);
  
-		ucr3 |= UCR3_DTRDEN | UCR3_RI | UCR3_DCD;
+		ucr3 |= IMX21_UCR3_RXDMUXSEL | UCR3_DTRDEN | UCR3_RI | UCR3_DCD;
  
  		if (sport->dte_mode)
  			/* disable broken interrupts */

Doesn't 6df765dca378bddf994cfd2044acafa501bd800f fix this for you?

Best regards
Uwe

The IMX serial driver is broken in the 4.9.x tree since 4.9.89.
Uwe's patch

6df765dca378bddf994cfd2044acafa501bd800f

please apply to clear the situation.

I know you very busy! -

Chris