linux-kernel - Re: [PATCH] Re: Linux v2.6.22-rc3

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Message-ID: <20070608153513.GE25649@havoc.gtf.org>
Date:	Fri, 8 Jun 2007 11:35:13 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Tejun Heo <htejun@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Gregor Jasny <gjasny@...glemail.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Re: Linux v2.6.22-rc3

On Fri, Jun 08, 2007 at 04:38:04PM +0100, Alan Cox wrote:
> > See a URL I posted earlier in this thread.  With dumb ATAPI devices we
> > actually have to wait a bit for BSY to be asserted.  Not only at reset,
> > but also for every command
> 
> 400nS and the current code correctly accounts for it.

No, _far_ longer than 400nS.  2ms minimum by the spec, but,

ATADRVR. blackmagic.html and googling around shows plenty of ATAPI
devices that don't get their shit together for 50-100ms.

The BIOS source I'm reviewing right now waits 50ms, after SRST.

	Jeff



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