linux-kernel - Re: [PATCH] serial: imx: enable IMX21_UCR3

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Date:   Thu, 3 May 2018 14:13:53 +0800
From:   Chris Ruehl <chris.ruehl@...ys.com.hk>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Jiri Slaby <jslaby@...e.com>, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: imx: enable IMX21_UCR3_RXDMUXSEL for non-dte-mode

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:
>> 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 <chris.ruehl@...ys.com.hk>
>> ---
>>   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