[alsa-devel] snd-aloop not working in linux-3.12.10

[Jaroslav Kysela]

Dne 5.3.2015 v 14:45 Srinivasan S napsal(a):
> Dear Jaroslav
> 
> As this feature ie., snd-aloop designed by you,  could you please redirect to the respective links where my queries can be posted & get the solutions for the problem

No idea. It looks like you are asking for a commercial support.
It may be a cache coherency issue or something else. The embedded/ARM
platforms might behave completely differently than x86 on which
this code was developed and tested.

				Jaroslav

> 
> As we are trying to establish GSM two way calls via stereo codec
> 
> We are planning to use loopback module (ie.,snd-aloop and alsaloop in ti sdk 7) to connect the sink/source and source/sink GSM and Codec. 
> 
> The below is the virtual devices created after configuring snd-aloop in the linux kernel 3.12.10
> 
> card 0, device 0
> card 0, device 1
> 
> whatever am playing we are unable to record in the virtual device, but we are able to play & record with actual device
> 
> aplay -D hw:0,0,0 play.wav
> arecord -D hw:0,1,0 record.wav or alsaloop -C hw:0,1 -P hw:0,0 -t 50000 # second terminal, latency 50ms
> 
> As per the logs below, am using the above commands to perform loopback, could you please let me know why am unable to perform the loopback with the below commands or please let me know am I missing any configurations, 
> 
> As this is feature is not working in ti sdk 7 (ie.,snd-aloop and alsaloop), 
> 
> Kindly requesting to try in your am335x-evm where it has tlv codec & verify this feature ie., snd-aloop & let me know as early as possible
> 
> 
> logs :
> ======
> root at am335x-evm:/# ls /dev/snd/   
> by-path    controlC1  pcmC0D0p   pcmC0D1p   pcmC1D0p
> controlC0  pcmC0D0c   pcmC0D1c   pcmC1D0c   timer
> root at am335x-evm:/# cat /proc/asound/devices
>   0: [ 0]   : control
>  16: [ 0- 0]: digital audio playback
>  17: [ 0- 1]: digital audio playback
>  24: [ 0- 0]: digital audio capture
>  25: [ 0- 1]: digital audio capture
>  32: [ 1]   : control
>  33:        : timer
>  48: [ 1- 0]: digital audio playback
>  56: [ 1- 0]: digital audio capture
> root at am335x-evm:/# 
> 
> Loopback device
> ----------------
> root at am335x-evm:/# aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
>   Subdevices: 8/8
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1
>   Subdevice #2: subdevice #2
>   Subdevice #3: subdevice #3
>   Subdevice #4: subdevice #4
>   Subdevice #5: subdevice #5
>   Subdevice #6: subdevice #6
>   Subdevice #7: subdevice #7
> card 0: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
>   Subdevices: 8/8
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1
>   Subdevice #2: subdevice #2
>   Subdevice #3: subdevice #3
>   Subdevice #4: subdevice #4
>   Subdevice #5: subdevice #5
>   Subdevice #6: subdevice #6
>   Subdevice #7: subdevice #7
> card 1: UDA1345TS [TI UDA1345TS], device 0: UDA134x uda134x-hifi-0 []
>   Subdevices: 1/1
>   Subdevice #0: subdevice #0
> root at am335x-evm:/# aplay -D hw:0,0,0 TangoForTajMusic11.wav 
> Playing WAVE 'TangoForTajMusic11.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
> 
> 
> 
> Actual device
> -------------
> root at am335x-evm:/# aplay -D hw:1,0,0 TangoForTajMusic11.wav                                                                                    
> Playing WAVE 'TangoForTajMusic11.wav' : Signed 16 bit Li[ 2219.654309] DAVINCIIIIIIIIII UDA134XXXXX SYSCLK=12288000
> ttle Endian, Rate 48000 Hz, Stereo
> [ 2219.663776] DAVINCIIIIIIIIII UDA134XXXXX BCLK FREQQ=1536000
> [ 2219.672880] DAVINCIIIIIIIIII UDA134XXXXX SYSCLK/BCLK_FREQ =8
> [ 2219.678982] uda134x_hw_params CLOCKS uda134x_hw_params uda134x->sysclk: 12288000, params_rate(params):48000
> [ 2219.689474] uda134x_hw_params FORMATS uda134x_hw_params dai_fmt: 16385, params_format:2
> [ 2219.698095] uda134x_hw_params FORMATS uda134x_hw_params uda134x->sysclk / params_rate(params) 256
> [ 2219.707644] UDA1345TSSSSSSSSSSSS SYSCLK / fs ratio is 256
> [ 2219.713470] uda134x_hw_params dai_fmt: 16385, params_format:2
> [ 2219.719639] UDA1345TSSSSSSSSSSSS FORMAT SND_SOC_DAIFMT_I2S
> [ 2219.725716] ENTERED davinci_config_channel_size davinci_config_channel_size: tx_rotate = 4
> [ 2219.734620] ENTERED davinci_config_channel_size davinci_config_channel_size: MASK= 65535
> [ 2219.748324] uda134x_unnnnnnnnmuteeeeeeeeee uda134x_mute mute: 0
> [ 2219.756522] davinci_mcasp_starttttttttttttttttttttt SNDRV_PCM_STREAM_PLAYBACK 
> 
> 
> Kindly do the needful as early as possible
> Awaiting for your replies,
> 
> Many Thanks in advance,


-- 
Jaroslav Kysela <perex at perex.cz>
Linux Kernel Sound Maintainer
ALSA Project; Red Hat, Inc.