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

[Rick Mann]

> On Apr 19, 2016, at 00:36 , Peter Ujfalusi <peter.ujfalusi at ti.com> wrote:
> 
> 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)?

It seems to be 0:

[    8.411990] davinci-mcasp 48038000.mcasp: davinci_mcasp_probe: enter
[    8.453167] davinci-mcasp 48038000.mcasp: serial-dir: 0
[    8.501317] davinci-mcasp 48038000.mcasp: invalid tdm slots: 0
[    8.554405] davinci-mcasp 4803c000.mcasp: davinci_mcasp_probe: enter
[    8.562924] davinci-mcasp 4803c000.mcasp: serial-dir: 0
[    8.635250] davinci-mcasp 4803c000.mcasp: invalid tdm slots: 0

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

I'm sorry, it seems to be an issue with OS X Mail. There are no settings to
control this, despite the fact that I have it set to send "plain-text" email.
I will try to insert hard carriage returns to shorten my typed text.

https://discussions.apple.com/thread/3040166?tstart=0


-- 
Rick Mann
rmann at latencyzero.com