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

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Date:	Thu, 25 Feb 2016 08:29:57 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.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



在 2016年02月24日 21:24, Bartlomiej Zolnierkiewicz 写道:
> 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>


Thanks Bartlomiej for sharing the test result.:-)


-
Caesar
>
> 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
>

-- 
Thanks,
Caesar