linux-kernel - Re: [PATCH 3/7] dw_dmac: get number of channels from hardware if possible

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Message-ID: <CAOh2x==Fud7k6VcxiiS2VBKsbfOJLZBsX=rtdV+QfdyYQEoY=Q@mail.gmail.com>
Date:	Fri, 21 Sep 2012 11:34:27 +0530
From:	viresh kumar <viresh.kumar@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Shiraz HASHIM <shiraz.hashim@...com>
Cc:	Vinod Koul <vinod.koul@...el.com>, spear-devel@...t.st.com,
	linux-kernel@...r.kernel.org, Hein Tibosch <hein_tibosch@...oo.es>
Subject: Re: [PATCH 3/7] dw_dmac: get number of channels from hardware if possible

On Thu, Sep 20, 2012 at 3:10 PM, viresh kumar <viresh.kumar@...aro.org> wrote:
> On Thu, Sep 20, 2012 at 3:05 PM, Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
>> On Tue, 2012-09-18 at 12:20 +0530, viresh kumar wrote:
>>> > @@ -1392,23 +1396,32 @@ static int __devinit dw_probe(struct platform_device *pdev)
>>> > +       dw_params = dma_raw_readl(regs, DW_PARAMS);
>>>
>>> Is this valid for every SoC implementation. What if this configuration
>>> is not valid
>>> for a particular SoC and it is invalid to access this address? Or this
>>> gives a invalid
>>> value instead of returning 0?
>
>> Actually I didn't get it clearly from the documentation. We have only
>> one test report from Hein until now.
>
> @Shiraz: Can you please verify reading this register from u-boot? This
> is important before we apply this patch to linux-next.

Ok. I have verified from the documentation. This are valid registers for SPEAr.
@Shiraz: No need to check now. :)

--
viresh
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