linux-kernel - Re: [PATCH v3 3/3] spi: spi-davinci: convert to DMA engine API

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Date:	Fri, 31 Aug 2012 22:01:49 +0530
From:	Vinod Koul <vkoul@...radead.org>
To:	Sekhar Nori <nsekhar@...com>
Cc:	vinod.koul@...el.com, Matt Porter <mporter@...com>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	grant.likely@...retlab.ca,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>, cjb@...top.org,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 3/3] spi: spi-davinci: convert to DMA engine API

On Fri, 2012-08-31 at 21:32 +0530, Sekhar Nori wrote:
> Hi Matt,
> 
> On 8/30/2012 8:13 PM, Matt Porter wrote:
> > On Thu, Aug 30, 2012 at 07:46:32PM +0530, Sekhar Nori wrote:
> >> Hi Matt,
> >>
> >> On 8/23/2012 6:39 AM, Matt Porter wrote:
> >>> Removes use of the DaVinci EDMA private DMA API and replaces
> >>> it with use of the DMA engine API.
> >>>
> >>> Signed-off-by: Matt Porter <mporter@...com>
> >>
> >> I tried testing this patch on my OMAP-L138 EVM, but SPI fails to 
> >> initialize after applying the patch.
> >>
> >> root@...go:~# dmesg | grep -i spi                                               
> >> spi_davinci spi_davinci.1: request RX DMA channel failed                        
> > 
> > Hi Sekhar,
> > 
> > Most likely CONFIG_TI_EDMA is off as it defaults to off in the v3
> > series. Try enabling this and if it's the problem then this error
> > path can be fixed to properly fallback to PIO only or fail to
> > initialize as needed.
> 
> Yes, this was the problem. Since the SPI driver now depends on
> CONFIG_TI_EDMA for basic operation may be select CONFIG_TI_EDMA in
> Kconfig if SPI is enabled? That should do until the fallback to PIO is
> implemented.
Then this should be enabled for SPI. Care to send a patch
> 
> With that fixed, I tested SPI on OMAP-L138 EVM and it works great.
> Tested a JFFS2 mount as well as some raw chardev read/write tests.
> 
> Tested-by: Sekhar Nori <nsekhar@...com>
> 
> Thanks,
> Sekhar
> --
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-- 
~Vinod Koul
Intel Corp.

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