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

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Date:	Fri, 31 Aug 2012 22:01:03 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Vinod Koul <vkoul@...radead.org>
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 8/31/2012 10:01 PM, Vinod Koul wrote:
> 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

By 'this' you mean the Kconfig select? Then there should be no need of a
new patch for this. It can be part of this patch itself, no?

Thanks,
Sekhar
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