linux-kernel - Re: [PATCH v12 05/11] edma: config: Enable config options for EDMA

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Message-ID: <CAD=GYparFQPMH801j9N2tRA6VnMidn23qUS9=yW8amOLSDLOzA@mail.gmail.com>
Date:	Mon, 24 Jun 2013 15:10:15 -0500
From:	Joel A Fernandes <agnel.joel@...il.com>
To:	Sekhar Nori <nsekhar@...com>
Cc:	Arnd Bergmann <arnd@...db.de>, Joel A Fernandes <joelagnel@...com>,
	Tony Lindgren <tony@...mide.com>,
	Matt Porter <matt@...orter.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Benoit Cousson <b-cousson@...com>,
	Russell King <linux@....linux.org.uk>,
	Rob Landley <rob@...dley.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jason Kridner <jkridner@...gleboard.org>,
	Koen Kooi <koen@...gleboard.org>,
	Devicetree Discuss <devicetree-discuss@...ts.ozlabs.org>,
	Linux OMAP List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux DaVinci Kernel List 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Documentation List <linux-doc@...r.kernel.org>,
	Linux MMC List <linux-mmc@...r.kernel.org>,
	Linux SPI Devel List 
	<spi-devel-general@...ts.sourceforge.net>
Subject: Re: [PATCH v12 05/11] edma: config: Enable config options for EDMA

On Mon, Jun 24, 2013 at 6:23 AM, Sekhar Nori <nsekhar@...com> wrote:
> On 6/22/2013 3:23 AM, Joel A Fernandes wrote:
>> Hi Arnd,
>>
>> On Fri, Jun 21, 2013 at 1:44 PM, Arnd Bergmann <arnd@...db.de> wrote:
>>> On Friday 21 June 2013, Joel A Fernandes wrote:
>>>> I think we are talking about different things, I agree the 'select
>>>> DMADEVICES' can be dropped but lets please keep the default y option
>>>> (not adding new select statements, just saying that if someone select
>>>> DMADEVICES in menuconfig and if they're ARCH_OMAP=1 , then default to
>>>> EDMA). This will simply allow people to have a default. Thanks.
>>>
>>> Yes, that's ok.
>>
>> Ok, thanks. I will follow up with a patch in my next submissions that builds it.
>>
>> Perhaps a:
>> default y if 'ARCH_OMAP2PLUS'
>>
>> and leave the existing as it is...
>> default n if  'ARCH_DAVINCI || ARCH_OMAP1 || ARCH_OMAP2'
>>
>> would make most sense to me. Basically EDMA is seen on current and all
>> new OMAP2PLUS.
>
> OMAP2PLUS devices like OMAP3/4 do not have EDMA so this is not really true.

Sure. Right now though, and from what I've seen, all future SoCs are
supporting EDMA.

>>
>>>
>>> config TI_EDMA
>>>         tristate "TI EDMA support"
>>>         default m if 'ARCH_DAVINCI || ARCH_OMAP1 || ARCH_OMAP2
>>>         select DMA_ENGINE
>>>         select DMA_VIRTUAL_CHANNELS
>>
>>
>>
>> MMC depends on EDMA specially on AM33xx there's no PIO mode AFAIK. The
>> 'm' option will require some initramfs to load the module when needing
>> to MMC boot, I suggest lets leave it as y.
>
> But there is no reason why it cannot work with PIO, right? Sounds like
> the right fix is in driver.

I am not sure about this. I agree no reason it cannot do PIO. I will check.
But even if it did, loading EDMA as a module will require omap_hsmmc to switch
to DMA mode which I am sure the driver doesn't support today.

Thanks,
Joel
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