linux-kernel - Re: [PATCH ide] : Increase WAIT

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Message-ID: <4AEC420A.9030502@rtr.ca>
Date:	Sat, 31 Oct 2009 09:56:26 -0400
From:	Mark Lord <liml@....ca>
To:	Robert Hancock <hancockrwd@...il.com>
Cc:	Philippe De Muyter <phdm@...qel.be>, linux-ide@...r.kernel.org,
	davem@...emloft.net, linux-kernel@...r.kernel.org
Subject: Re: [PATCH ide] : Increase WAIT_DRQ to support slow CF cards

Robert Hancock wrote:
..
> This has come up before:
> 
> http://marc.info/?l=linux-ide&m=123064513313466&w=2
> 
> I think this timeout should not even exist. libata has no such timeout 
> (only the overall command completion timeout), and I can't find any 
> reference in current ATA specs to the device being required to raise DRQ 
> in any particular amount of time.
..

The reason for the original (20ms, then 50ms) timeout was this text
from the ATA1 specification, long since outdated:

   -  Upon receipt of a Class 3 command, the drive sets BSY within 400 nsec,
      sets  up the sector buffer for a write operation, sets DRQ within 20
      msec, and clears BSY within 400 nsec of setting DRQ.

Cheers
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