09:46 <jbrunet> xdarklight: alsa API (alsamixer/amixer) is enough on every SoC to properly set the routes. This is actually the only way to tweak alsa kcontrols.

09:46 <jbrunet> There is an infinite number of valid config which depends on the platform but also the current use-case

09:46 <jbrunet> Each SoC boots up in the reset configuration of the registers which does not provide a valid confguration on Amlogic.

09:46 <jbrunet> For example, on G12 which of the 3 Playback PCM should feed HDMI. All 3 are equally valid. You may even which to switch from one the other at runtime.

09:46 <jbrunet> This can't be handled in the kernel.

09:46 <jbrunet> Once you've got a config you are happy with, you can use 'alsactl' to save a restore the card controls (easy to automate on boot)

09:46 <jbrunet> Alsa UCM is something a bit more complicated to help libraries such as pulseaudio or pipewire figure out things automatically. I have something ongoing for it but it is not there yet.

11:59 <f_> Hi!

12:21 <f_> <xdarklight> f_: I'd check dmesg first to see if an ALSA card shows up. I'm not aware of any other alsamixer issues

12:21 <f_> Sure.

15:47 <f_> So I need to cut down my kernel config. Which options are needed (gxbb)?

15:48 <f_> I'd also prefer keeping the kernel image small, so using modules.

20:50 <xdarklight> jbrunet: ah, thanks. so UCM is just a shortcut so you don't have to manually toggle lots of things

20:51 <xdarklight> f_: CONFIG_SND_SOC_HDMI_CODEC, CONFIG_SND_MESON_AIU, CONFIG_SND_MESON_CARD_UTILS, CONFIG_SND_MESON_CODEC_GLUE and CONFIG_SND_MESON_GX_SOUND_CARD come to my mind

20:54 <f_> xdarklight: That's it?

20:55 <f_> These are all related to the sound. Is there anything else needed in the kernel?

20:57 <xdarklight> f_: I think only the basic toggles to enable sound (CONFIG_SOUND and CONFIG_SND). aarch64 defconfig doesn't have a lot of "common" sound symbols (only a bunch of codecs and SoC specific toggles): https://github.com/torvalds/linux/blob/master/arch/arm64/configs/defconfig#L806

20:58 <f_> Yes

20:58 <f_> But which options are required at all for the Meson GXBB SoC?

20:59 <f_> I would like to compile a kernel without anything that won't get used.

20:59 <f_> 3h of compiling is too much.

20:59 <f_> I should make my XMPP/Matrix account join this channel, now that I think about it.

21:02 <f_[xmpp]> Hi there!

21:02 <f_[xmpp]> That's from XMPP.

21:03 <f_[xmpp]> I'll check logs in the link mentionned in the topic tomorrow.

21:03 <f_[xmpp]> Bye!

21:10 <xdarklight> f_[xmpp]: the config symbols I mentioned previously should be all. the KII Pro doesn't seem to have any special codecs (at least not listed in .dts) other than HDMI audio. other boards may need for example CONFIG_SND_SOC_SPDIF (SPDIF out) or CONFIG_SND_SOC_ES7134 (an analog codec that's soldered to some boards)