Onboard audio devices and -audiodev none

Onboard audio devices and -audiodev none

[Markus Armbruster]

Watch this:

    $ aarch64-softmmu/qemu-system-aarch64 -S -nodefaults -accel qtest -display none -M vexpress-a15 -audiodev none,id=foo
    audio: Device lm4549: audiodev default parameter is deprecated, please specify audiodev=foo

I did, didn't I?

Also: use warn_report()?

Re: Onboard audio devices and -audiodev none

[Gerd Hoffmann]

On Fri, May 15, 2020 at 09:06:20AM +0200, Markus Armbruster wrote:
> Watch this:
> 
>     $ aarch64-softmmu/qemu-system-aarch64 -S -nodefaults -accel qtest -display none -M vexpress-a15 -audiodev none,id=foo
>     audio: Device lm4549: audiodev default parameter is deprecated, please specify audiodev=foo
> 
> I did, didn't I?

https://patchwork.ozlabs.org/project/qemu-devel/patch/20200429110214.29037-13-kraxel@redhat.com/

cheers,
  Gerd

Re: Onboard audio devices and -audiodev none

[Markus Armbruster]

Gerd Hoffmann <kraxel@redhat.com> writes:

> On Fri, May 15, 2020 at 09:06:20AM +0200, Markus Armbruster wrote:
>> Watch this:
>> 
>>     $ aarch64-softmmu/qemu-system-aarch64 -S -nodefaults -accel qtest -display none -M vexpress-a15 -audiodev none,id=foo
>>     audio: Device lm4549: audiodev default parameter is deprecated, please specify audiodev=foo
>> 
>> I did, didn't I?
>
> https://patchwork.ozlabs.org/project/qemu-devel/patch/20200429110214.29037-13-kraxel@redhat.com/

I don't immediately understand how that addresses my issue, but I trust
it does :)

Re: Onboard audio devices and -audiodev none

[Gerd Hoffmann]

On Mon, May 18, 2020 at 06:59:01AM +0200, Markus Armbruster wrote:
> Gerd Hoffmann <kraxel@redhat.com> writes:
> 
> > On Fri, May 15, 2020 at 09:06:20AM +0200, Markus Armbruster wrote:
> >> Watch this:
> >> 
> >>     $ aarch64-softmmu/qemu-system-aarch64 -S -nodefaults -accel qtest -display none -M vexpress-a15 -audiodev none,id=foo
> >>     audio: Device lm4549: audiodev default parameter is deprecated, please specify audiodev=foo
> >> 
> >> I did, didn't I?
> >
> > https://patchwork.ozlabs.org/project/qemu-devel/patch/20200429110214.29037-13-kraxel@redhat.com/
> 
> I don't immediately understand how that addresses my issue, but I trust
> it does :)

Well, not the patch itself, it handles pcspk only.  But we could use the
same naming convention for all other onboard audio devices too:  Have
them try lookup a "onboard" audio backend and use that if it exists.
Don't initialize if not.

Not fully sure this is a good plan, thats why the patch is tagged 'RfC'.
Better idea are welcome.  In the blockdev world floppy has a similar
problem, is there any way to link floppy and blockdev without -global
isa-fdc.driveA=... meanwhile?

cheers,
  Gerd

Re: Onboard audio devices and -audiodev none

[Markus Armbruster]

Gerd Hoffmann <kraxel@redhat.com> writes:

> On Mon, May 18, 2020 at 06:59:01AM +0200, Markus Armbruster wrote:
>> Gerd Hoffmann <kraxel@redhat.com> writes:
>> 
>> > On Fri, May 15, 2020 at 09:06:20AM +0200, Markus Armbruster wrote:
>> >> Watch this:
>> >> 
>> >>     $ aarch64-softmmu/qemu-system-aarch64 -S -nodefaults -accel qtest -display none -M vexpress-a15 -audiodev none,id=foo
>> >>     audio: Device lm4549: audiodev default parameter is deprecated, please specify audiodev=foo
>> >> 
>> >> I did, didn't I?
>> >
>> > https://patchwork.ozlabs.org/project/qemu-devel/patch/20200429110214.29037-13-kraxel@redhat.com/
>> 
>> I don't immediately understand how that addresses my issue, but I trust
>> it does :)
>
> Well, not the patch itself, it handles pcspk only.  But we could use the
> same naming convention for all other onboard audio devices too:  Have
> them try lookup a "onboard" audio backend and use that if it exists.
> Don't initialize if not.

When an onboard device is an integral part of the physical board we're
emulating, then it should be connected to a suitable null backend when
we don't have a better default.

> Not fully sure this is a good plan, thats why the patch is tagged 'RfC'.
> Better idea are welcome.  In the blockdev world floppy has a similar
> problem, is there any way to link floppy and blockdev without -global
> isa-fdc.driveA=... meanwhile?

Yes, but it won't help with onboard sound: -device floppy just works
now.  The general problem of configuring onboard devices still needs a
solution.  This recent thread has some ideas:

Subject: Configuring onboard devices (was: Failing property setters + hardwired devices + -global = a bad day)
Date: Thu, 30 Apr 2020 12:03:12 +0200 (2 weeks, 3 days, 22 hours ago)
Message-ID: <87tv11e1en.fsf_-_@dusky.pond.sub.org>
https://lists.nongnu.org/archive/html/qemu-devel/2020-04/msg05468.html