linux-kernel - Re: [PATCH 05/39] ARM: ux500: Stop passing MMC's platform data for Device Tree boots

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Date:	Wed, 15 May 2013 18:50:47 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Vinod Koul <vinod.koul@...el.com>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Arnd Bergmann <arnd@...db.de>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>
Subject: Re: [PATCH 05/39] ARM: ux500: Stop passing MMC's platform data for
 Device Tree boots

On Wed, May 15, 2013 at 11:51 AM, Lee Jones <lee.jones@...aro.org> wrote:

> It was required to pass DMA channel configuration information to the
> MMC driver before the new DMA API was in place. Now that it is, and
> is fully compatible with Device Tree we can stop doing that.
>
> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

So since the use of dma_request_slave_channel() is not upstream,
I guess this will break DMA use (i.e slow down transfers!) on all
device tree boots?

I'd be happy to apply it once the MMCI patch is in linux-next
indicating there may just be a window in the merge period
where it falls back to IRQ mode, but I don't want to disable
DMA on DT boots for an entire kernel cycle just like that.

Not applied as of yet.

Yours,
Linus Walleij
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