[Letux-kernel] AESS / Audio Driver for Pyra

Belisko Marek marek.belisko at gmail.com
Mon Oct 29 12:53:28 CET 2018

hi Michael,
On Mon, Oct 29, 2018 at 12:44 PM Michael Mrozek
<EvilDragon at openpandora.org> wrote:
> Hi,
> AESS / Audio is one of the biggest remaining issues we have on the Pyra.
> Everything else seems to work good enough for a start now, but missing audio on
> a gaming handheld is a bit annoying :)
> With some kernel version, speaker output stopped completely, but Nikolaus is
> currently looking into what changed with each kernel version and when exactly it
> stopped working to get this to work again, at least.
> This would make audio work again, but it would still have the following issues:
> * Weird setup of sound devices: You would expect that the system would provide
> different audio outputs (speakers, headset) to the Linux system, but AFAIK, for
> some weird reason, there's a 4-channel device where the headset is channel 1 and
> 2 and the speakers are channel 3 and 4. This should be fixed, so that Pulseaudio
> shows different outputs (like on normal Linux systems) so you can move around
> your streams where you want them to have.
> * AESS... well, not mandatory for a first release, but in the future, it should
> work, as software mixing just unnecessarily needs CPU power.
> @Marek: I know you've been working on this, question is: Are you still doing
> something here?
> Or have you given up for now?
I've given up because changes would need a lot of time as sound
firmware loading was changed rapidly.
> @All:
> If no one wants to work on that (or CAN work on that), I'm thinking of hiring a
> team that could do this in fulltime.
> Nikolaus pointed me to these guys:
> https://bootlin.com/engineering/technical-support-and-consulting/
They are very good but I expect they will not be cheap :)
> Does anyone have experience with them or have any other reliable freelancers by
> hand which I could hire for that.
> Geez, I didn't think the TWL6040 would be SO hard to get to work properly...
> Thanks in advance :)
> --
> Greetings,
> Michael Mrozek
> -----------------------
> OpenPandora GmbH
> CEO: Michael Mrozek
> Schäffbräustr. 11
> 85049 Ingolstadt
> Germany
> Tel.: +49 841 990 5548
> http://www.openpandora.de/
> HRB 4879, Amtsgericht Ingolstadt
> -----------------------
> eMail: mrozek at openpandora.org


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Marek Belisko - OPEN-NANDRA
Freelance Developer

Ruska Nova Ves 219 | Presov, 08005 Slovak Republic
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