> -----Original Message----- > From: Hans de Goede [mailto:hdegoede@xxxxxxxxxx] > Sent: Sunday, December 24, 2017 6:43 PM > To: Bard Liao > Cc: Pierre-Louis Bossart; alsa-devel@xxxxxxxxxxxxxxxx > 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 > > ------Please consider the environment before printing this e-mail. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
