linux-kernel - Re: [PATCH] DW: Read "is_memcpy" and "is

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Message-ID: <15b77367-2f95-deb2-a4dc-c47730bdb939@synopsys.com>
Date:   Tue, 23 Aug 2016 10:14:52 -0700
From:   Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
CC:     "robh@...nel.org" <robh@...nel.org>,
        "Nelson.Pereira@...opsys.com" <Nelson.Pereira@...opsys.com>,
        "vinod.koul@...el.com" <vinod.koul@...el.com>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>
Subject: Re: [PATCH] DW: Read "is_memcpy" and "is_nollp" property from device
 tree.

On 08/23/2016 10:02 AM, Andy Shevchenko wrote:
> On Tue, 2016-08-23 at 15:14 +0000, Eugeniy Paltsev wrote:
>
>> DW DMAC on ARC SDP became broken after df5c7386 ("dmaengine: dw:
>>>> some Intel devices has no memcpy support") and 30cb2639
>>>> ("dmaengine: dw: don't override platform data with autocfg")
>>>> commits.
>>> I'm not sure that word 'broken' is a correct one here. Is the
>>> platform
>>> code using this driver in the upstream already? If so, where is it
>>> located?
>>>
>> I'm not sure is it, but, at least, it changed driver behavior for ARC
>> SDP boards.
> The rule of common sense here: if it was never upstreamed it has never
> been broken.

Right !

> I hardly remember any user of DW DMAC by ARC architecture in upstream.

The ARC SDP platform is provided by arch/arc/plat-axs and arch/arc/boot/ax*
The IP Proto-typing kit folks here would just add a DT binding in there and things
would just work out of the box - and that stopped recently - hence the notion of
broken. But I agree one can't fix what can't be seen as broken. I just intervened
to make this comment - I'm sure you and Eugeniy can agree on a workable solution.

Thx,
-Vineet