[Fwd: Re: Davinci ASoC support (patch)]

[lokowich <lokowich@acdstar.com>]

Forwarded from davinci-linux-open-source list:

I've built this ASoC patch into my DaVinci git kernel (thanks for the 
SENSORS tip), and can use aplay and speaker-test, but no sound.  Figured 
it may be a mixer/volume control issue, but the alsamixer is unable to 
open for a failed ioctl on USBDEVFS_IOCTL.  Not sure why there is a USB 
dependency.  Noted that there is no /sys/class/sound/mixer in my sysfs.  
Any ideas?

Mark

Bernard Blackham wrote:
> Behme wrote:
>   
>> While searching something different, I just found
>>
>> http://www.spinics.net/lists/alsa-devel/msg12535.html
>>
>> As I'm not subscribed to alsa-devel, I don't have the original post. 
>> Maybe any of the authors can post it do this list as well?
>>
>> The patch mainly applies to our git. I fixed two small rejects in 
>> Kconfig and Makefile as the patch is for newer kernel than our git. 
>> Untested patch against our git in attachment. Anybody likes to test?
>>     
>
> Well, I tried compiling it and it failed to build. It appears that it's 
> built on a set of patches for Davinci posted to LAK, including this 
> completely revamped EDMA support[1]:
>
> http://www.spinics.net/lists/arm-kernel/msg47450.html
>
> So I had to change a few definitions, import a few functions from the new
> DMA support and managed to get it compiling and loading, but not yet working
> (tried various sample rates and formats):
>
> root@davinci-dvevm:/tst$ aplay test.wav
> Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
> ALSA lib pcm_params.c:2152:(snd_pcm_hw_refine_slave) Slave PCM not usable
> aplay: set_params:878: Broken configuration for this PCM: no configurations
> available
>
> root@davinci-dvevm:/tst$ arecord -r 48000 -f S16_LE
> Recording WAVE 'stdin' : Signed 16 bit Little Endian, Rate 48000 Hz, Mono
> ALSA lib pcm_params.c:2152:(snd_pcm_hw_refine_slave) Slave PCM not usable
> arecord: set_params:878: Broken configuration for this PCM: no
> configurations available
>
>
> And this is the extent of my knowledge of ALSA - I can continue digging, but
> maybe somebody else will beat me to it =) It's looking promising though.
>
> Attached is the patch I have so far that applies against current git. This
> is not for going upstream, but just for testing. Notes:
> - Apply patch
> - Enable SND_SOC, SND_DAVINCI_SOC, SND_DAVINCI_SOC_I2S, SND_DAVINCI_SOC_EVM
> and SND_SOC_TLV320AIC3X.
> - Make sure CONFIG_I2C_DAVINCI is enabled, but disable the
> CONFIG_SENSORS_TLV320* options.
> - Build.
> - Load the snd-soc-evm module.
>
> Bernard.
>
> [1] These patches appear to have gone absolutely nowhere beyond that list. I
> can't find them in any tree. But they are cleaner and more conforming to the
> Linux Kernel style than what's currently in git.
>
>   
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