linux-kernel - Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find dma channel

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Message-ID: <CAHp75Vf1+pFqe9PLvsowmTiWcc1_e1awqmaEy+esHeOnPOpNGQ@mail.gmail.com>
Date:	Sun, 20 Dec 2015 19:41:51 +0200
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Måns Rullgård <mans@...sr.com>
Cc:	Julian Margetson <runaway@...dw.ms>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] ata: sata_dwc_460ex: use "dmas" DT property to find
 dma channel

On Sun, Dec 20, 2015 at 7:11 PM, Måns Rullgård <mans@...sr.com> wrote:
> Julian Margetson <runaway@...dw.ms> writes:
>
>> On 12/19/2015 4:41 PM, Måns Rullgård wrote:
>>> Andy Shevchenko <andy.shevchenko@...il.com> writes:
>>>
>>>> On Sat, Dec 19, 2015 at 10:16 PM, Julian Margetson <runaway@...dw.ms> wrote:
>>>>> On 12/19/2015 3:07 PM, Måns Rullgård wrote:
>>>>>> Julian Margetson <runaway@...dw.ms> writes:

>> [   18.606292] dma dma0chan0: dwc_tx_submit: queued 2
>> [   18.611091] dma dma0chan0: dwc_dostart_first_queued: started 2
>> [   48.748614] ata3: lost interrupt (Status 0x40)
>
> Now we're getting somewhere.  The dma transfer is set up and initiated,
> but then nothing happens.  Comparing the old sata_dwc driver, from
> before the switch to dmaengine, with the dw_dma driver, I noticed an
> obvious problem: the descriptors are filled in using the wrong byte
> order.

So, it means we have IO in little endian, but DMA reads data from
memory in big endian?

>  This patch might fix that.

In case it works I have to test it on AVR32.

-- 
With Best Regards,
Andy Shevchenko
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