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

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Message-ID: <56CD4757.4080501@gmail.com>
Date:	Wed, 24 Feb 2016 14:01:59 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Alexander Kochetkov <al.kochet@...il.com>
Cc:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.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,

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/



-
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
>
>
>
>
> -- 
> Thanks,
> Caesar