linux-kernel - Re: [PATCH] dma: add new DMA control commands

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Message-Id: <201210181049.21556.marex@denx.de>
Date:	Thu, 18 Oct 2012 10:49:21 +0200
From:	Marek Vasut <marex@...x.de>
To:	Huang Shijie <b32955@...escale.com>
Cc:	Vinod Koul <vinod.koul@...ux.intel.com>, djbw@...com,
	khali@...ux-fr.org, ben-linux@...ff.org, w.sang@...gutronix.de,
	cjb@...top.org, dwmw2@...radead.org, lrg@...com,
	broonie@...nsource.wolfsonmicro.com, perex@...ex.cz, tiwai@...e.de,
	shawn.guo@...aro.org, artem.bityutskiy@...ux.intel.com,
	linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
	alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
	linux@....linux.org.uk, Huang Shijie <shijie8@...il.com>,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: Re: [PATCH] dma: add new DMA control commands

Dear Huang Shijie,

> 于 2012年10月18日 16:16, Marek Vasut 写道:
> > So we can't stream data from the chip? About time to adjust the MTD
> > framework to allow that. Maybe implement a command queue?
> 
> IMHO, it's not possible. Because the READ-PAGE(00h-30h) command needs to
> check the busy status
> which means we have to stop in the middle, so we can not chain the all
> the read-pages DMA commands.

Can the DMA not branch?

> thanks
> Huang Shijie

Best regards,
Marek Vasut
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