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

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Date:	Thu, 18 Oct 2012 17:13:11 +0800
From:	Huang Shijie <b32955@...escale.com>
To:	Marek Vasut <marex@...x.de>
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

于 2012年10月18日 16:49, Marek Vasut 写道:
> 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?
it's too complicated to the MTD layer, as well as the gpmi driver.

Best Regards
Huang Shijie


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