linux-kernel - Re: [PATCH] dw_dmac: adjust slave_id accordingly to request line base

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Message-ID: <20130220060417.GB23302@intel.com>
Date:	Wed, 20 Feb 2013 11:34:17 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.jf.intel.com>
Cc:	Viresh Kumar <viresh.linux@...il.com>,
	linux-kernel@...r.kernel.org,
	spear-devel <spear-devel@...t.st.com>,
	Mika Westerberg <mika.westerberg@...ux.jf.intel.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Svahn, Kai" <kai.svahn@...el.com>
Subject: Re: [PATCH] dw_dmac: adjust slave_id accordingly to request line
 base

On Tue, Feb 19, 2013 at 11:02:24AM +0200, Andy Shevchenko wrote:
> On Mon, 2013-01-28 at 13:04 +0200, Andy Shevchenko wrote: 
> > On some hardware configurations we have got the request line with the offset.
> > The patch introduces convert_slave_id() helper for that cases. The request line
> > base is got from the platform device resources provided by the IORESOURCE_DMA
> > type.
> 
> Hi, Vinod.
> 
> v3.8 is just out, and we have not got any proposal from anyone how to
> make our approach better. So, I'm just wondering about current state.
I was trying to go thru ACPI 5 and see a solution, i think we 
- use IORESOURCE_IO, but they have a specfic meaning
- accpet this patch with IORESOURCE_DMA, but again this has specfic dma meaning
  too. Just becoz you are in slave-dma driver, doesn't justify use of
  IORESOURCE_DMA as well
- use platform_data (somehow get this from CSRT into device parsing logic of
  ACPI where you create your platform device and add this in platform data

> Rafael, could you share your opinion about our case with CSRT and
> request line base (perhaps you need to go through the entire thread)?
Sure, do we have anything better than above?

--
~Vinod
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