linux-kernel - Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA

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Date:	Wed, 24 Feb 2016 14:24:14 +0100
From:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:	Caesar Wang <caesar.upstream@...il.com>
Cc:	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Alexander Kochetkov <al.kochet@...il.com>,
	Vinod Koul <vinod.koul@...el.com>, shawn.lin@...kchips.com,
	Addy Ke <addy.ke@...k-chips.com>,
	Boojin Kim <boojin.kim@...sung.com>, dmaengine@...r.kernel.org,
	olof Johansson <olof@...om.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: commit 271e1b86e691 is breaking DMA uart on SoCFPGA


Hi,

On Wednesday, February 24, 2016 02:01:59 PM Caesar Wang wrote:
> Hi,
> 
> Thanks Dinh & Alexander for the intergration testing.
> 
> ---
> 
> @Dinh,
> 
> Can you test it again with the patch[0]?
> 
> patch[0]:
> https://patchwork.kernel.org/patch/8398511/

This fixes the problem for me (tested on Samsung Exynos4412 SoC
based Trats2 board).

You may add:

Tested-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

to your patch.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

> -
> Caesar
> 在 2016年02月23日 23:14, Dinh Nguyen 写道:
> > Hi,
> >
> > Sorry that I couldn't get to this sooner.
> >
> > On 02/18/2016 10:07 AM, Alexander Kochetkov wrote:
> >> Hello!
> >>
> >> Bartlomiej, could you please tell what uart driver is used on Samsung
> >> Exynos4412?
> >> Dinh, could you please tell what uart driver is used on SoCFPGA?
> >>
> > SoCFPGA is using the 8250_dw.c uart driver.
> >
> >> Could you make two test?
> >>
> >> 1) Checkout tree at commit 848e9776fee4 "dmaengine: pl330: support
> >> burst mode for
> >>   dev-to-mem and mem-to-dev transmit", make it buildable and see is it
> >> works. In order to make in buildable remove bursts argument from the
> >> line:
> >>
> >>      if (*bursts == 1)
> >>      - return _bursts(pl330, dry_run, buf, pxs, 1);
> >>      + return _bursts(dry_run, buf, pxs, 1);
> >>
> > This case still fails for me.
> >
> >> 2) Checkout next-20160211 kernel tree and set src_maxburst and
> >> dst_maxburst to 1 inside UART driver to see is it works?
> >>
> > This case works and the UART is able to operate in DMA mode.
> >
> > Dinh