Recording failed , imx6q with wm8962

[shanchong234]

Current BSP : yocto with branch of   imx_3.10.53_1.1.0-ga

Target Board: Custom board schematic circuit  is basically copy from  imx6qsabresd,

                        except the MCLK of wm8962 , we use 24MHz external crystal instead.

The Problem:

          I use the following command to test recording.

                         arecord -vv -t wav -fdat -d 10 rdfile.wav

          when i play the "rdfile.wav" file , there is no sound.

          I have checked "ADCDAT" pin of wm8962 while recording ,  there is no signal out.

          The power supply pins on wm8962 are all normal .

           I believe my  board is ok , because  i can record voice normally with the bsp of L3.0.35_4.1.0 on this board.

           So i compared wm8962 driver code between  the two bsps ,  try to find solution, but failed.

          Can any body tell me the solution or any advices ?

[jimmychan]

what is the output "aplay -l"?

have you turn on the capture switches in alsamixer for sound recording?

[shanchong234]

output for "aplay -l":

**** List of PLAYBACK Hardware Devices ****

card 0: wm8962audio [wm8962-audio], device 0: HiFi wm8962-0 []

  Subdevices: 1/1

  Subdevice #0: subdevice #0

I think the capture switches in alsamixer has been turned on, as i have exec the following commands:

	amixer cset numid=8 iface=MIXER,name='Digital Capture Volume' 127
	amixer cset numid=10,iface=MIXER,name='Capture Switch' on
	amixer sset 'Capture' 100
	amixer sset 'INPGAR IN3R' on
	amixer sset 'MIXINR IN3R' on

[jimmychan]

For example, according to the INPUT SIGNAL PATH diagram in WM8962 datasheet, if you want to select the path is IN3R -> IN3R_TO_INPGAR -> PGAR -> INPGAR_TO_MIXINR -> MIXINR -> ADC(RIGHT).  Then you need to enable "MIXINR INPGAR".  Also, you can increase the volume INPGAR_MIXINR_VOL or

IN3R_MIXINR_VOL.

You can check the corresponding name of the switch and mixer in the wm8962.c wm8962_intercon[]. Then you can find the name in the alsamixer.

then try  "arecord -f cd test.wav ".

[shanchong234]

I found an options of "MIXINR PGA", and turned it on, then，checked vol options ,make sure they are unmute.

but, the problem is still exist.

i doubt is there any bugs on the driver code of wm8962 ? it is very  hard for me to find out and fix it.

i really hope i can get a very sure answer ：the recording function of wm8962 has been well tested on the platform of imx6qsabresd board, and is work fine.

anyway , thanks very much for your patiently reply.