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

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Message-ID: <CAMiH66HCDLZaxXckQz1bfqscNm2X2480HTr4bFHdJNteDLb=ig@mail.gmail.com>
Date:	Thu, 18 Oct 2012 11:11:15 -0400
From:	Huang Shijie <shijie8@...il.com>
To:	Marek Vasut <marex@...x.de>
Cc:	Huang Shijie <b32955@...escale.com>,
	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, Fabio Estevam <fabio.estevam@...escale.com>
Subject: Re: [PATCH] dma: add new DMA control commands

On Thu, Oct 18, 2012 at 6:51 AM, Marek Vasut <marex@...x.de> wrote:
> Dear Huang Shijie,
>
>> 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.
>
> Can you please elaborate ?
could you read the nand spec about how to read a page out with the
READ-PAGE(00-30) command,
and tell me how to make the DMA branch?
I really have no idea about how to make the DMA branch.

thanks
Huang Shijie
.


> Best regards,
> Marek Vasut
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