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Date:	Tue, 27 Oct 2009 13:24:48 +0300
From:	Sergei Shtylyov <>
To:	Philippe De Muyter <>
Cc:	David Miller <>,,,
Subject: Re: [PATCH ide] : Increase WAIT_DRQ to support slow CF cards


Philippe De Muyter wrote:

>> From: Robert Hancock <>
>> Date: Mon, 26 Oct 2009 19:40:03 -0600
>>> On Mon, Oct 26, 2009 at 7:19 PM, David Miller <> wrote:
>>>> 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.
>>> I agree, it's sub-optimal but it helps.. if the user wants better
>>> behavior they should a) fix it so that the card isn't using PIO, at
>>> least if it supports DMA and b) not use drivers/ide..
> Strangely enough, I also had no timeout problem if I started my kernel with
> 'ide=nodma', instead of increasing WAIT_DRQ.

    Hm, interesting...

>  So I surmise that WAIT_DRQ is used in the dma case.

   It's used only for the PIO write commands -- see do_rw_taskfile() in 
ide-taskfile.c... DMA commands don't require waiting for BSY=0, DRQ=1 

> Philippe

WBR, Sergei

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