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

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Date:	Mon, 21 Dec 2015 18:48:17 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Måns Rullgård <mans@...sr.com>
Cc:	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 Sun, 2015-12-20 at 22:55 +0200, Andy Shevchenko wrote:
> On Sun, Dec 20, 2015 at 10:17 PM, Andy Shevchenko
> <andy.shevchenko@...il.com> wrote:
> > On Sun, Dec 20, 2015 at 8:49 PM, Måns Rullgård <mans@...sr.com>
> > wrote:
> > I noticed thanks to DWC_PARAMS that burst size is hardcoded to 32
> > items on this board, however registers for SATA program it to 64. I
> > remember that I got no interrupt when I programmed transfer width
> > wrongly (64 bits against 32 bits) when I ported dw_dmac to be used
> > on
> > Intel SoCs.
> 
> One more thing, I have a patch to monitor DMA IO, we may check what
> exactly the values are written / read  in DMA. I can share it
> tomorrow.

As promised the patch I have to debug IO of DW DMA. Didn't check though
if it applies cleanly on top of recent vanilla kernel.

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

View attachment "0001-dw_dmac-debug-dma-controller-IO.patch" of type "text/x-patch" (3689 bytes)