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From: Tejun Heo <tj@kernel.org>
To: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Cc: linux-ide@vger.kernel.org, vladimir.barinov@cogentembedded.com
Subject: Re: [PATCH] sata_rcar: clear STOP bit in bmdma_start() method
Date: Wed, 22 May 2013 08:41:28 +0900	[thread overview]
Message-ID: <20130521234128.GD6985@mtj.dyndns.org> (raw)
In-Reply-To: <201305212307.55385.sergei.shtylyov@cogentembedded.com>

On Tue, May 21, 2013 at 11:07:54PM +0400, Sergei Shtylyov wrote:
> Iff bmdma_setup() has to stop a DMA transfer before starting a new one, then the
> STOP bit in the ATAPI_CONTROL1 register will remain set (it's only cleared when
> setting the START bit to 1) and then bmdma_start() method will set both START
> and STOP bits simultaneously which should abort the transfer being just started.
> Avoid that by explicitly clearing the STOP bit in bmdma_start() method (in this
> case it will be ignored on write).
> 
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

Applied to libata/for-3.10-fixes w/ stable cc'd.

Thanks.

-- 
tejun

  reply	other threads:[~2013-05-21 23:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-21 19:07 [PATCH] sata_rcar: clear STOP bit in bmdma_start() method Sergei Shtylyov
2013-05-21 23:41 ` Tejun Heo [this message]
2013-05-22 13:12   ` Sergei Shtylyov
2013-05-23 12:14     ` Sergei Shtylyov

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