Linux ATA/IDE development
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From: Sergei Shtylyov <sshtylyov@ru.mvista.com>
To: benh@kernel.crashing.org
Cc: linux-ide@vger.kernel.org, Jeff Garzik <jgarzik@pobox.com>,
	Tejun Heo <htejun@gmail.com>
Subject: Re: libata and DMA quirks
Date: Fri, 27 Jun 2008 12:37:29 +0400	[thread overview]
Message-ID: <4864A6C9.2050709@ru.mvista.com> (raw)
In-Reply-To: <1214548895.8011.526.camel@pasglop>

Hello.

Benjamin Herrenschmidt wrote:
> The main one is that one their latest cell, they do the following
> "workarounds" which I never implemented in drivers/ide/ppc/pmac.c but
> I'd like to implement in the libata driver, unless you believe that is
> unnecessary:
>
> a) For any ATAPI DMA, If the transfer size is not a multiple of 16
> bytes, switch to PIO for this command.
>   

   No need to do this in old driver anyway since the *IDE* core only 
uses DMA for block commands like READ and WRITE.
Not sure about libata.

WBR, Sergei



  reply	other threads:[~2008-06-27  8:37 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-06-27  6:41 libata and DMA quirks Benjamin Herrenschmidt
2008-06-27  8:37 ` Sergei Shtylyov [this message]
2008-06-27  8:51   ` Benjamin Herrenschmidt
2008-06-27  9:10     ` Sergei Shtylyov
2008-06-27  9:31       ` Benjamin Herrenschmidt
2008-06-27  8:54 ` Alan Cox
2008-06-27  9:29   ` Benjamin Herrenschmidt

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