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

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Message-ID: <1452243464.30729.430.camel@linux.intel.com>
Date:	Fri, 08 Jan 2016 10:57:44 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Måns Rullgård <mans@...sr.com>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Julian Margetson <runaway@...dw.ms>, 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 Thu, 2016-01-07 at 18:32 +0000, Måns Rullgård wrote:

> Andy Shevchenko <andriy.shevchenko@...ux.intel.com> writes:
> 
> > On Wed, 2016-01-06 at 19:36 +0200, Andy Shevchenko wrote:
> > > 
> > So, Måns, Julian, I just have published my repository containing
> > Måns'
> > and my patches regarding dw_dmac and sata_dwc_460ex drivers here
> > 
> > https://bitbucket.org/andy-shev/linux/branch/topic%2Fdw%2Fnext
> 
> I've picked out the relevant changes from your branch and made some
> additional improvements.  A few notes:
> 
> - The __be32/__le32 typedefs for the DMA descriptor fields are
> necessary
>   to avoid a million sparse warnings (and sparse is correct to warn).

Hmm… Which version of sparse are you using? I always run builds with
sparse enabled and didn't see anything.

> - Using #ifdef CONFIG_AVR32 is a step back, IMO, since this driver
> may
>   well be used on another big endian system some day.  The Kconfig
> logic
>   for selecting this option could perhaps be improved though.

Maybe runtime chosen accessors will be better than ifdefs?
I don't like the Kconfig option which limits application of the
(compiled) driver.

> 
> Tested on AVR32 (DMA driver) and Sigma SMP8642 (SATA driver).
> 
> Code here:
> https://bitbucket.org/mansr/linux-dwc/branch/dwc-sata

Thanks for testing!

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy