linux-kernel - Re: The snd-aw2 audio driver conflicts with saa7146-based video adapters

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Date:	Wed, 15 Oct 2008 23:07:29 +0200
From:	Cédric Brégardis <cedric.bregardis@...e.fr>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Chuck Ebbert <cebbert@...hat.com>, jhassler@...e.fr,
	linux-kernel@...r.kernel.org
Subject: Re: The snd-aw2 audio driver conflicts with saa7146-based video adapters

Le Tuesday 14 October 2008, Takashi Iwai a écrit :
> At Mon, 13 Oct 2008 19:59:23 -0400,
>
> Chuck Ebbert wrote:
> > snd-aw2 ("Emagic Audiowerk 2 sound driver") matches on PCI ID for any
> > board containing an saa7146 chip. When the driver loads it blocks the
> > proper driver from loading. It also blindly assumes that it is driving an
> > aw2 adapter and just starts writing to various I/O ports...
>
> Indeed, that's bad.
> I guess simply adding PCI SSID would solve this (hopefully).
>
> Cedric, Jean, could you show "lspci -nv" output of the AW2 device?
> (more better submit a patch? :)

Here is lspci -nv for aw2:

02:0b.0 0480: 1131:7146 (rev 01)
        Flags: medium devsel, IRQ 19
        Memory at feafbc00 (32-bit, non-prefetchable) [size=512]

And here is lspci -x:

02:0b.0 Multimedia controller: Philips Semiconductors SAA7146 (rev 01)
00: 31 11 46 71 02 00 80 02 01 00 80 04 00 40 00 00
10: 00 bc af fe 00 00 00 00 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
30: 00 00 00 00 00 00 00 00 00 00 00 00 0b 01 00 00

So, the subsystem id and subsystem vendor id is 0, which is the default value 
for SAA7146. SAA7146 can be configured to use a specific subid with an eeprom, 
but it is not done here. However we can verify that the subid is zero. It is 
not a perfect solution, but it is better than nothing. I will try to provide a 
patch next week.

However what can we do if there is another card with SAA7146 and with the 
default subid which is not the aw2 sound card ?

Best regards,
Cedric
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