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

[Rick Mann]

> On Apr 19, 2016, at 00:00 , Peter Ujfalusi <peter.ujfalusi at ti.com> wrote:
> 
> 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

Interesting, I'll look at that when I start modifying the DTS again. I see that uses the '3106. My own cape has the '3104 on it, which is why I'm trying to get the AudioCape RevB working (my cape has additional GPIOs controlling regulators and resets that I'll have to accommodate).
> 
>> $ 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.

Yup, seems like it's 0:

[   67.876673] davinci-mcasp 48038000.mcasp: Slots: 2, max_active_serializers: 1, active_serializers: 0, channels: 2, mcasp->num_serializer: 0
[   67.889362] davinci-mcasp 48038000.mcasp: ASoC: can't set 48038000.mcasp hw params: -22


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


-- 
Rick Mann
rmann at latencyzero.com