-----Original Message----- From: Hans de Goede [mailto:hdegoede@redhat.com] Sent: Sunday, December 24, 2017 6:43 PM To: Bard Liao Cc: Pierre-Louis Bossart; alsa-devel@alsa-project.org Subject: Cherry Trail + RT5645 devices analog microphone not working.
Hi Bard,
I've been looking into getting the microphone to work on some Cherry Trail + RT5645 devices with what appears to be a simple analog microphone.
You can see the microphone on one of the models I'm trying to get it to work on soldered onto the right side of the PCB here: https://i.imgur.com/bJzBQWe.jpg
I'm using this ucm config:
https://fedorapeople.org/~jwrdegoede/chtrt5645/
Which is basically Pierre-Louis Bossart's config from: https://github.com/plbossart/UCM
Adjusted because the devices all have a mono speaker.
I've been trying to get this to work myself and I can get some sound while recording by adding:
cset "name='RECMIXL BST2 Switch' on" cset "name='RECMIXR BST2 Switch' on"But then I mainly get noise, I do get some sound from the microphone if I talk really really loudly, but it is barely above the noise-floor. I've the feeling that BST2 is only picking up the microphone via cross-talk and that BST1 indeed is the correct input, but for some reason I get complete silence when recording when only BST1 is selected in the RECMIXR, and yes I've checked / set the "IN1 boost volume".
TL;DR: I'm trying to get an analog mic to work on 3 different models Cherry Trail + RT5645 devices and I've been unable to get this to work. I've put a registerdump of the rt5645 with gnome-sound-recorder running here: https://fedorapeople.org/~jwrdegoede/rt5645-mic-red.dump
Any insights / help with this would be very much welcome.
I don't have the schematic, but I think you probably need micbias for the capture. Please add both "micbias1" and "micbias2" in the audio route since I don't know which one is needed. for example static const struct snd_soc_dapm_route cht_rt5645_audio_map[] = { ... {"Int Mic", NULL, "micbias1"}, {"Int Mic", NULL, "micbias2"}, ... };
Regards,
Hans
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