lkml.org 
[lkml]   [2016]   [Jul]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [RFC RESEND] serial: 8250: fix regression in 8250 uart driver
From
Date
On Sat, 2016-07-02 at 13:53 +0200, Thorsten Leemhuis wrote:
> On 14.06.2016 18:00, Andy Shevchenko wrote:
> > On Tue, 2016-06-14 at 10:27 -0500, dinh.linux@anniebear.net wrote:
> > > > On Mon, 2016-06-13 at 21:59 -0500, Dinh Nguyen wrote:
> > > > I suppose this one, i.e. commit dd4e91d538b3 ("dmaengine: slave
> > > > means at
> > > > least one of DMA_SLAVE, DMA_CYCLIC"), solves the issue.
> > > Hmm...that commit didn't seem to fix my issue.
> > […]
> > > Does this mean that the 8250_dw.c driver can no longer use DMA?
> >
> > It means that previously the use of DMA engine whatever was used is
> > not
> > correct in your case. There is no issues in UART driver, the issue
> > is in
> > DMA controller driver.
> >
> > I'm working on a quirk that will allow user to enforce PIO mode for
> > Rx/Tx or both. In that case if DMA controller can't be fixed you
> > still
> > might use DMA for Tx.
>
> What's the status of this issue?

Apparently I'm not going to fix DMA controller engine if it even would
be fixed (I don't know what one you use), but I will continue with the
mentioned quirk as soon as I finish one higher priority task. Sorry for
a delay.

> Just wondering, as this issue is listed
> in my regression reports for 4.7 and it seems nothing much happened
> for
> more than a week now – which is a bad sign as the 4.7 release seems
> only
> a week or two away.


--

Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy

\
 
 \ /
  Last update: 2016-07-02 14:41    [W:0.123 / U:0.192 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site