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

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Date:	Thu, 18 Oct 2007 03:19:57 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	Shane.Huang@....com
Cc:	gregkh@...e.de, htejun@...il.com, linux-kernel@...r.kernel.org,
	linux-pci@...ey.karlin.mff.cuni.cz, Henry.Su@....com,
	Libin.Yang@....com
Subject: Re: [patch] PCI: disable MSI on more ATI NorthBridges

From: "Shane Huang" <Shane.Huang@....com>
Date: Thu, 18 Oct 2007 17:14:36 +0800

> More ATI North Bridges like RS780 can't do MSI like its predecessors
> in linux. Disable MSIs on them.
> 
> Signed-off-by: Shane Huang <shane.huang@....com>

Can we get some detail as to why these north bridges have to have MSI
disabled completely?  I can't believe that all 6 of these ATI
controllers which will now be listed in the quirk table cannot use MSI
at all.

I've discovered several cases where it was a buggy device or a driver
bug that caused someone to erroneously submit patches that disable MSI
completely for the bridge they were behind.

I don't want that to happen any more.  One way to prevent that is to
have a full detailed justification for the MSI disabling in the
changelog or in the comments for the MSI quirk.

Thank you.
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