linux-kernel - Re: [PATCH RESEND] agp: fix SIS 5591/5592 wrong PCI id

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Date:	Tue, 12 Aug 2008 06:31:35 +0200
From:	Krzysztof Helt <krzysztof.h1@...pl>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	airlied@...ux.ie, linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [PATCH RESEND] agp: fix SIS 5591/5592 wrong PCI id

On Mon, 11 Aug 2008 17:08:03 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Sun, 10 Aug 2008 22:54:52 +0200
> Krzysztof Helt <krzysztof.h1@...pl> wrote:
> 
> > From: Krzysztof Helt <krzysztof.h1@...pl>
> > 
> > The correct id for the AGP bridge is the id of 
> > the main host (5591) not the id of the PCI-to-PCI
> > bridge AGP (0001). Output from "lspci -nv" shows 
> > that only the former has AGP capabilities flag set:
> > 
> > 00:00.0 0600: 1039:5591 (rev 02)
> >         Flags: bus master, medium devsel, latency 64
> >         Memory at ec000000 (32-bit, non-prefetchable) [size=32M]
> >         Capabilities: [c0] AGP version 1.0
> > 
> > 00:02.0 0604: 1039:0001 (prog-if 00 [Normal decode])
> >         Flags: bus master, fast devsel, latency 0
> >         Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
> >         I/O behind bridge: 0000c000-0000cfff
> >         Memory behind bridge: eb500000-eb5fffff
> >         Prefetchable memory behind bridge: eb300000-eb3fffff
> > 
> > 
> > Signed-off-by: Krzysztof Helt <krzysztof.h1@...pl>
> > ---
> > 
> > The AGP bridge is correctly detected with the patch applied.
> > I have tested it on PC Chips M570 motherboard.
> > 
> > --- linux-mm/drivers/char/agp/sis-agp.c~	2008-08-04 18:00:31.133979040 +0200
> > +++ linux-mm/drivers/char/agp/sis-agp.c	2008-08-06 18:33:02.162916563 +0200
> > @@ -241,7 +241,7 @@ static struct pci_device_id agp_sis_pci_
> >  		.class		= (PCI_CLASS_BRIDGE_HOST << 8),
> >  		.class_mask	= ~0,
> >  		.vendor		= PCI_VENDOR_ID_SI,
> > -		.device		= PCI_DEVICE_ID_SI_5591_AGP,
> > +		.device		= PCI_DEVICE_ID_SI_5591,
> >  		.subvendor	= PCI_ANY_ID,
> >  		.subdevice	= PCI_ANY_ID,
> >  	},
> 
> This fix appears to be applicable to both 2.6.25.x and to 2.6.26.x.  Do you
> think that the problem which it solves is sufficiently serious to
> warrant the backport?
> 

This is old chipset and the error is since kernel 2.6.8 when the
untested support was introduced. I would skip stable branches
as I used it only few days for now. In fact, it is like adding new
hardware which was previously not supported.

Regards,
Krzysztof
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