linux-kernel - RE: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash

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Message-ID: <4C79549CB6F772498162A641D92D5328D9FE16@penmb01.corp.atmel.com>
Date:	Tue, 18 Jan 2011 09:43:45 +0800
From:	"Xu, Hong" <Hong.Xu@...el.com>
To:	"Ryan Mallon" <ryan@...ewatersys.com>
Cc:	<linux-kernel@...r.kernel.org>, <linux-mtd@...ts.infradead.org>,
	<linux-arm-kernel@...ts.infradead.org>, <jamie@...ieiles.com>,
	<jacmet@...site.dk>, "Nicolas Ferre" <nicolas.ferre@...el.com>
Subject: RE: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash

Hi Ryan,
> -----Original Message-----
> From: Ryan Mallon [mailto:ryan@...ewatersys.com]
> Sent: Tuesday, January 18, 2011 6:42 AM
> To: Xu, Hong
> Cc: linux-mtd@...ts.infradead.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; jamie@...ieiles.com; jacmet@...site.dk;
> Ferre, Nicolas
> Subject: Re: [PATCH] MTD: atmel_nand: Add DMA support to access Nandflash
> 
> root@...pper:~$ dmesg | grep -i dma
> [    0.850000] atmel_nand atmel_nand: Failed to request DMA channel
> [    0.860000] atmel_nand atmel_nand: No DMA support for NAND access.
> [    1.530000] at_hdmac at_hdmac: Atmel AHB DMA Controller ( cpy slave ),
> 8 channels
> 
> 
> It looks like the registration for the DMA controller happens after the
> NAND driver probe and so the request is failing. I had a quick look, but
> I can't see anything that would change this in more recent kernels. Any
> ideas?
> 
You got the point. A [Git Pull] has been sent, see
http://article.gmane.org/gmane.linux.kernel/1088240/match=dmaengine+update

In this patch, subsys_initcall will be used so DMA engine will be initialized before NAND driver.
Thanks.

BR,
Hong
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