linux-kernel - Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

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Message-ID: <455B6928.5030202@garzik.org>
Date:	Wed, 15 Nov 2006 14:23:20 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Stephen Hemminger <shemminger@...l.org>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ALSA: hda-intel - Disable MSI support by default

Stephen Hemminger wrote:
> On Tue, 14 Nov 2006 23:24:04 -0500
> Jeff Garzik <jeff@...zik.org> wrote:
> 
>> David Miller wrote:
>>> Is this absolutely true?  I've never been sure about this point, and I
>>> was rather convinced after reading various documents that once you
>>> program up the MSI registers to start generating MSI this implicitly
>>> disabled INTX and this was even in the PCI specification.
>>>
>>> It would be great to get a definitive answer on this.
>>>
>>> If it is mandatory, perhaps the driver shouldn't be doing it and
>>> rather the PCI layer MSI enabling should.
> 
> pci_enable_msi() calls msi_capability_init() and that disables intx
> already.
[...]
> The driver shouldn't deal with this, pci_disable_msi() does.

Explicit code reference please?

AFAICS the PCI layer only touched INTx bit for PCI-Express devices.

	Jeff


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