linux-kernel - Re: [PATCH] serial driver PMC MSP71xx, kernel linux-mips.git mast er

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Date:	Mon, 12 Feb 2007 20:56:25 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Marc St-Jean <Marc_St-Jean@...-sierra.com>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mips@...ux-mips.org
Subject: Re: [PATCH] serial driver PMC MSP71xx, kernel linux-mips.git mast
  er

Hello.

Marc St-Jean wrote:

>> >> > Fourth attempt at the serial driver patch for the PMC-Sierra MSP71xx
>> >>device.

>>    I think you need to submit your patch to Andrew Morton since it 
>>requires a patch from his tree.

> OK, will do.

    In fact, since the serial drivers are not maintained anymore, this seems 
the only option.

>> >> > +                     /* The DesignWare APB UART has an Busy Detect
>> >>(0x07)
>> >> > +                      * interrupt meaning an LCR write attempt
>> >>occured while the
>> >> > +                      * UART was busy. The interrupt must be cleared
>> >>by reading
>> >> > +                      * the UART status register (USR) and the LCR
>> >>re-written. */
>> >> > +                     unsigned int status;
>> >> > +                     status = *(volatile u32 
>>*)up->port.private_data;
>> >> > +                     serial_out(up, UART_LCR, up->lcr);
>> >> > +
>> >> > +                     handled = 1;
>> >> > +
>> >> > +                     end = NULL;
>> >> >               } else if (end == NULL)
>> >> >                       end = l;

>> >> >       return 0;

>> >>    Still, shouldn't you be doing this in serial8250_timeout()

>> > No, the serial8250_timeout is for issue 1 at the top, this is for
>> > issue 2.

>>    It's for lost interrupts, IIUC. They use anothe timeout handler for the
>>workaround...

> This issue (2) is a completely new type of interrupt generated but the
> DesignWare APB uart, it has nothing to do with lost interrupts.

    Yeah, I just thought that the lost interrupts might be a "generic" issue.

>> >>also?
>> >>What IRQ numbers this UART is using, BTW?

>> > For the ports on the device they are 27 and 42. Is there any 
>>significance
>> > that I'm not aware of?

>>    Yeah, IRQ0 is treated as no IRQ by 8250, and in this case it falls 
>>back to using serial8250_timeout() to handle "interrupts".

> Good to know. It won't be affecting us then.

    This may be overriden anyway...

>> >>    Oops, your mailer went and did it again. :-)

>> > I'm completely giving up on Thunderbird,unless someone can point out

>>    Ypu should have long ago. :-)

>> > the specific internal configuration items which needs a kick!

>>    Only the attachments will work in the Mozilla kind mailer, AFAIK.
>>The last patch looked OK at last. :-)

> The attachemnents appear to be MIME which is a no-no according the

    The text/plain type attachments seem to be acceptable for the most 
maintainers.  This Mozilla can do, at least. :-)

> linux FAQ at kernel.org. I guess I'll stick with /bin/mail.

> Thanks,
> Marc

WBR, Sergei
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