linux-kernel - Re: [patch] PCI: disable MSI on more ATI NorthBridges

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Date:	Fri, 19 Oct 2007 14:57:49 -0500
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Shane Huang <chunhao.huang@...mail.com>
Cc:	davem@...emloft.net, gregkh@...e.de, htejun@...il.com,
	brice.goglin@...il.com, david.gaarenstroom@...il.com,
	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	shane.huang@....com, jgarzik@...ox.com, linux-ide@...r.kernel.org
Subject: Re: [patch] PCI: disable MSI on more ATI NorthBridges

On Fri, Oct 19, 2007 at 09:17:23PM +0800, Shane Huang wrote:
> Since we have little experience on PCI and MSI here, we had to try to

As someone else pointed out, AMD should have *lots* of people with
pci and msi experience on the payroll.  (Folks here buy AMD-designed 
pci chips ...)

> ONLY
> comment out the pci_intx() call in drivers/ata/ahci.c
> My system can boot up too with MSI enabled!
> 
> So does it mean that the root cause is our SB700 SATA controller
> has a hardware bug where setting INTX_DISABLE in the PCI COMMAND
> register masks MSI interrupts too? 

That's what it sounds like, to me.

> And what is the software solution or workaround?

Not sure. Sounds like the device driver needs a quirk for this part.

The over-worked Jeff Garzik is the maintainer for that driver.

You should probably provide the pci device id for this beast.

--linas

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