linux-kernel - Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops

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Date:	Thu, 13 Dec 2007 13:21:12 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"David P. Reed" <dpreed@...d.com>
Cc:	David Newall <david@...idnewall.com>,
	Rene Herman <rene.herman@...access.nl>,
	Paul Rolland <rol@...917.net>,
	"H. Peter Anvin" <hpa@...or.com>, Krzysztof Halasa <khc@...waw.pl>,
	Pavel Machek <pavel@....cz>, Andi Kleen <andi@...stfloor.org>,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, rol@...be.net
Subject: Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64
 with MCP51 laptops

On Thu, 13 Dec 2007 08:13:29 -0500
"David P. Reed" <dpreed@...d.com> wrote:

> Perhaps what was meant is that ISA-tuned timings make little sense on 
> devices that are part of the chipset or on the PCI or PCI-X buses?

No.

ISA as LPC bus is alive and well inside and outside chipsets. Welcome to
planet earth and the reality of 'its cheaper to reuse cells than design a
new one'. For the chipset logic like DMA controllers the _p is absolutely
correct.

Alan
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