linux-kernel - Re: Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

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Message-ID: <20080116200829.26040351@lxorguk.ukuu.org.uk>
Date:	Wed, 16 Jan 2008 20:08:29 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	David Newall <davidn@...idnewall.com>
Cc:	"David P. Reed" <dpreed@...d.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Rene Herman <rene.herman@...access.nl>,
	Zachary Amsden <zach@...are.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Christer Weinigel <christer@...nigel.se>,
	Ondrej Zary <linux@...nbow-software.org>,
	Bodo Eggert <7eggert@....de>, Ingo Molnar <mingo@...e.hu>,
	Paul Rolland <rol@...917.net>, Pavel Machek <pavel@....cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	rol <rol@...be.net>
Subject: Re: Re: [PATCH] x86: provide a DMI based port 0x80
 I/O delay override.

> If the hardware required an intermediate junk I/O, that would be a
> reason to do one, but it doesn't, does it?  It requires a delay.  It's
> written thus in all of the application notes.

And the only instruction that is synchronized to the bus in question is
an I/O instruction. 

> Wrong again.  Of course one knows how long the delay should be.  The bus
> speed is known. 

Wrong again. ISA bus speed is neither defined precisely, nor visible in a
system portable fashion.

I'm so glad you have nothing better to do than troll, if you
actually wrote code I'd be worried it might get into something people
used.

Alan
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