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

[Peter Ujfalusi]

On 04/19/16 10:18, Rick Mann wrote:
> 
>> 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

How can it be?
can you take a look of the davinci_mcasp_set_pdata_from_of() function where
the serial-dir is set up? Do we get the of_serial_dir32? What is the size of
the array we got (val)?

BTW: can you check your mail client to wrap the lines around 78 characters?

-- 
Péter