[alsa-devel] [Alsa-user] hdmi sound rerouted?

[Deucher, Alexander]

> -----Original Message-----
> From: Dagg Stompler [mailto:daggs at gmx.com]
> Sent: Saturday, October 19, 2013 5:49 AM
> To: Takashi Iwai; Deucher, Alexander
> Cc: Clemens Ladisch; alsa-user at lists.sourceforge.net; alsa-devel at alsa-
> project.org
> Subject: Re: [alsa-devel] [Alsa-user] hdmi sound rerouted?
> 
> > ----- Original Message -----
> > From: Takashi Iwai
> > Sent: 10/08/13 10:49 AM
> > To: Deucher, Alexander
> > Subject: Re: [alsa-devel] [Alsa-user]  hdmi sound rerouted?
> >
> > At Mon, 7 Oct 2013 13:36:24 +0000,
> > Deucher, Alexander wrote:
> > >
> > > > -----Original Message-----
> > > > From: Takashi Iwai [mailto:tiwai at suse.de]
> > > > Sent: Monday, September 30, 2013 5:18 AM
> > > > To: Deucher, Alexander
> > > > Cc: Clemens Ladisch; Dagg Stompler; alsa-user at lists.sourceforge.net;
> alsa-
> > > > devel at alsa-project.org
> > > > Subject: Re: [alsa-devel] [Alsa-user] hdmi sound rerouted?
> > > >
> > > > At Mon, 30 Sep 2013 02:23:22 +0000,
> > > > Deucher, Alexander wrote:
> > > > >
> > > > > > -----Original Message-----
> > > > > > From: Clemens Ladisch [mailto:cladisch at googlemail.com]
> > > > > > Sent: Saturday, September 28, 2013 6:33 PM
> > > > > > To: Dagg Stompler
> > > > > > Cc: alsa-user at lists.sourceforge.net; Deucher, Alexander; alsa-
> > > > devel at alsa-
> > > > > > project.org
> > > > > > Subject: Re: [Alsa-user] [alsa-devel] hdmi sound rerouted?
> > > > > >
> > > > > > Dagg Stompler wrote:
> > > > > > >> daggs at gmx.com wrote:
> > > > > > >>> card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
> > > > > > >>> card 1: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0]
> > > > > > >>> card 2: HDMI [HDA ATI HDMI], device 3: HDMI 0 [HDMI 0]
> > > > > > >>
> > > > > > >> The second one is called "Generic" because your kernel does not
> (yet)
> > > > > > >> know the hardware.
> > > > > > >>
> > > > > > >>> 01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI]
> Cedar
> > > > > > HDMI Audio [Radeon HD 5400/6300 Series]
> > > > > > >>> 06:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI]
> RV635
> > > > > > HDMI Audio [Radeon HD 3600 Series]
> > > > > > >>
> > > > > > >> These are the HDMI outputs of *two* graphics cards. The first
> one's
> > > > > > >> model is so new that the driver doesn't know it.
> > > > > > >
> > > > > > > the 3600 doesn't have hdmi socket so I think it is irrelevant for my
> issue.
> > > > > >
> > > > > > The RV635 chip does support HDMI outputs (even if none are
> actually
> > > > > > connected), so the corresponding PCI device shows up here.
> > > > > >
> > > > > > >>> If you update the kernel, you will get two devices named "HDA
> ATI
> > > > > > HDMI".
> > > > > > >
> > > > > > > upgrade to where?
> > > > > >
> > > > > > Oops. Even the latest driver lacks the PCI IDs of many HDMI HDA
> devices
> > > > > > (aa50/aa58/aa60/aa68/aa80/aa88/aa90/aa98:
> > > > > > Cypress/Juniper/Redwood/Cedar/
> > > > > > Cayman+Antilles/Barts/Turks/Caicos).
> > > > > >
> > > > > > Alex, are these devices that require disabling snooping?
> > > > >
> > > > > Sorry what does snooping mean in this context?
> > > >
> > > > Most of HD-audio controller have a snoop control, but the recent AMD
> > > > HDMI audio controller don't have the feature, thus the driver must use
> > > > the non-cached pages. At least, PCI ID 1002:aaa0, aaa8 and aab0 are
> > > > known to require such.
> > > >
> > > > Now the question is whether all new chips above (aa50,...) require the
> > > > same workaround, too. Could you check this or forward the inquiry to
> > > > someone in AMD?
> > >
> > > According to our internal teams, disabling snooping is only required on
> the audio parts included in Evergreen and Northern Islands GPUs. Older chips
> like R7xx (aa48) and newer chips like Southern Islands (aaa0) are able to use
> snooping. I'm not real familiar with the audio portions of the GPUs so if you
> need further clarification, let me know.
> >
> > Thanks for the information.
> >
> > Though, it's strange that the information doesn't match with what I've
> > heard (and also with what I've tested with a laptop). I've heard that
> > it's Southern Island HDMI that needs the snoop-disablement.
> >
> > Could you ask again whether it's really Evergreen / Nothern Islands?
> >
> >
> > thanks,
> >
> > Takashi
> >
> > >
> > > Alex
> > >
> > > >
> > > > FWIW, such a chip needs to set AZX_DRIVER_ATIHDMI_NS bits in
> > > > driver_data of pci entries in sound/pci/hda/hda_intel.c.
> > > >
> > > >
> > > > thanks,
> > > >
> > > > Takashi
> > >
> > >
> 
> any updates on the matter guys?


Haven't heard back.  I'll ping them again.

Alex