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

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Message-Id: <20091026.181922.261475236.davem@davemloft.net>
Date:	Mon, 26 Oct 2009 18:19:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hancockrwd@...il.com
Cc:	phdm@...qel.be, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH ide] : Increase WAIT_DRQ to support slow CF cards

From: Robert Hancock <hancockrwd@...il.com>
Date: Mon, 26 Oct 2009 19:07:18 -0600

> libata only busy-waits for 50 microseconds, if not set then it sleeps
> for 2ms and polls for another 10 microseconds, if still not set it
> tries the whole thing again at 16ms intervals. Only after (typically)
> 30 seconds does it give up.

Porting that kind of logic over to IDE is a non-starter.

It's easier to get people to move over to using the ATA layer for
their devices.

Meanwhile we should provide a way for things to work, and
realistically the only way to do that currently is to bump the
WAIT_DRQ value to some large number.

And that's exactly the kind of patch I'm willing to accept for this.
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