Re: mss.c pcm fix to ' attach returned 6 ' load failure for v5.x acpi and up

From: Nate Lawson <nate_at_root.org>
Date: Mon, 18 Jul 2005 13:16:42 -0700
John Baldwin wrote:
> On Saturday 16 July 2005 02:58 pm, M. Warner Losh wrote:
> 
>>: dmesg excerpt ...
>>: mss_probe: bus acpi0 is probing device pcm0
>>: mss_probe: isa_get_logicalid() returned 0!
>>
>>This is the problem.  It shouldn't be probing there.  It doesn't in
>>current.  Chances are John beat me to it and we're arguing over
>>something that's been fixed...
> 
> 
> I removed that probe in current.  The problem is that ACPI has HID values that 
> are strings like "ACPI0003" that don't fit the EISAID model, so for devices 
> like ACPI thermal zones that only have an ACPI HID, there's no PNP-compatible 
> HID or CID to return to the ISA drivers.  I think the proper solution is that 
> drivers that don't support ACPI-enumerate devices (recall that ACPI 
> enumerates PNPBIOS devices) need to stop having acpi attachments, and that 
> drivers that do need to use ISA_PNP_PROBE().  I think that the only embedded 
> sound controllers are PCI, so that probably all of the ISA PNP sound drivers 
> don't need acpi attachments but I could be wrong.

You can have a sound controller present in a dock.  Most of those are 
across a pci-pci bridge but some docks export the LPC bus lines directly 
to a duplicate super I/O.  I agree with you though that it is very 
unlikely someone used such a design for the sound controller.

-- 
Nate
Received on Mon Jul 18 2005 - 18:25:03 UTC

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