lkml.org 
[lkml]   [2015]   [May]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v2] serial: imx: Revert "initialized DMA w/o HW flow enabled"
From
Hi Sebastian,

On Fri, May 8, 2015 at 4:13 AM, Sebastian Andrzej Siewior
<sebastian@breakpoint.cc> wrote:
> From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
>
> This basically reverts commit 068500e08dc8 ("serial: imx: initialized
> DMA w/o HW flow enabled") simply because it does not work.
> I tested it on various IMX6 boards and the default SDMA firmware, that is
> included in ROM, does not work properly. The SDMA interrupt counter does
> not stop increment (which means the SDMA does not stop working) and I see
> a lot of 0x00 (sometimes other bytes) which are added to the tty buffer
> which are not part of the data transfer.
> Jiada claimed that there is a firmware which makes it work but failed to
> provide me a link to the firmware. All he said was that it can not be
> shipped as part of the kernel due to license issues. I've found one
> firmware in the FSL-tree but this firmware causes only TTY-overflows and
> *no* data is transmitted.
>
> Currently I see no other way out.

Could you please test Philipp's patch?
http://marc.info/?l=linux-serial&m=143202566332128&q=raw

It worked on my tests and DMA still works with his patch, so I would
prefer his solution.

Thanks,

Fabio Estevam


\
 
 \ /
  Last update: 2015-05-19 15:01    [W:0.077 / U:1.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site