linux-kernel - Re: [PATCH] Resurrect IT8172 IDE controller driver

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Date:	Thu, 04 Dec 2008 19:17:16 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Shane McDonald <mcdonald.shane@...il.com>
Cc:	bzolnier@...il.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Resurrect IT8172 IDE controller driver

Hello.

Alan Cox wrote:

>>I am not sure how to determine if IORDY sampling is supported by a
>>drive.  If I'm reading the code correctly, other drivers only check
>>that the PIO mode is > 2 (not > 1 as in my driver) -- that seems to be
>>the case for at least piix.c, siimage.c, and it8213.c.

> Old IDE is wrong on this and in fact unless it has changed recently
> simply can't cope with and doesn't provide functions for it. A libata

    It's not as wrong as you're trying to paint it: ide_get_best_pio_mode() 
has been here for ages and it have been returning the IORDY setting -- 
although it actually asks the drive only when auto-tuning the mode, and when 
being given the explicit mode only tells to use IORDY on modes > 2.

WBR, Sergei
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