[alsa-devel] mcasp: stream has more channels (2) than are enabled in mcasp (0)

[Peter Ujfalusi]

On 04/19/16 03:25, Rick Mann wrote:
> Thanks for the suggestions, Peter, I really appreciate the help. Here's
> what I get:
> 
> [  256.743991] davinci-mcasp 48038000.mcasp: Slots: 2,
> max_active_serializers: 1, active_serializers: 0, channels: 2
> 
> I rebuilt the 4.4.7-bone-rt-r9 kernel using Robert C Nelson's bb-kernel
> repo scripts. I modified sound/soc/davinci/davinci-mcasp.c to print some
> diagnostics. Rebooted, then executed the following. Note that
> BB-BONE-AUDI-02.dts is
> <https://github.com/RobertCNelson/bb.org-overlays/blob/master/src/arm/BB-BONE-AUDI-02-00A0.dts>,
> and the base DTB is <http://pastebin.com/5vVEdAKt>:

Looks OK.

FWIW: I have the following patch on top of linux-next to get the BBW's
AudioCape RevA working:
https://github.com/omap-audio/linux-audio/commit/37d2421c321762360a6982b37107b617b0f74bee

> $ sudo su # echo BB-BONE-AUDI-02 > $SLOTS # aplay -l **** List of PLAYBACK
> Hardware Devices **** card 0: B [AudioCape Rev B], device 0:
> davinci-mcasp.0-tlv320aic3x-hifi tlv320aic3x-hifi-0 [] Subdevices: 1/1 
> Subdevice #0: subdevice #0 # speaker-test
> 
> speaker-test 1.0.28
> 
> Playback device is default Stream parameters are 48000Hz, S16_LE, 1
> channels Using 16 octaves of pink noise Rate set to 48000Hz (requested
> 48000Hz) Buffer size range from 16 to 32768 Period size range from 8 to
> 16384 Using max buffer size 32768 Periods = 4 Unable to set hw params for
> playback: Invalid argument Setting of hwparams failed: Invalid argument
> 
> speaker-test caused the following to be logged:
> 
> [  256.743991] davinci-mcasp 48038000.mcasp: Slots: 2,
> max_active_serializers: 1, active_serializers: 0, channels: 2

Now this is odd... Can you print also the mcasp->num_serializer here? If it is
0, then something really strange is going on.
We set this up in davinci_mcasp_set_pdata_from_of() when reading the
serial-dir array.

> [256.754343] davinci-mcasp 48038000.mcasp: ASoC: can't set 48038000.mcasp hw
> params: -22
> 
> 
> Full logs:
> 
> http://pastebin.com/HGhu9CPk
> 
> 
> 
> 


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