[alsa-devel] BockW 4th sound doesn't work on latest linus/master

[Kuninori Morimoto]

Hi Simon, Mark again

> I noticed that bockw 4th sound device doesn't work on
> latest linus/master.
> 
> My git bisect said the trigger is this patch
> 
> e14ee5deab24200e4b70fe31a8c806f0acd3d37c
> (ARM: shmobile: bockw: Do not enable CONFIG_DEVTMPFS defconfig)
> 
> This patch removed below from defconfig
> 
> -CONFIG_DEVTMPFS=y
> -CONFIG_DEVTMPFS_MOUNT=y
> 
> But, why this has relationship to sound ??
> 
> #0 - #3 sound device have no problem.
> But #4 sound device will be broken by this patch
> Do you have any idea ?
> 
> --- my kernel log -------
> ...
> ALSA device list:
>   #0: SSI56-AK4643
>   #1: SSI3-AK4554(playback)
>   #2: SSI4-AK4554(capture)
>   #3: SSI7-AK4554(playback)
>   #4: SSI8-AK4554(capture)
> 
> --- test result of 4th device (bad case) ---
> 
> # /home/arecord -c 2 -t wav -d 10 -r 48000 -f S16_LE -D hw:4 /tmp/hoge
> ALSA lib pcm_hw.c:1433:(_snd_pcm_hw_open) Invalid value for card
> arecord: main:608: audio open error: No such file or directory
> 
> --- test result of 4th device (good case) ---
> 
> # /home/arecord -c 2 -t wav -d 10 -r 48000 -f S16_LE -D hw:4 /tmp/hoge
> Recording WAVE '/tmp/hoge' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo

My rootfs with no DEVTMPFS didn't have /dev/snd/controlC4, /dev/snd/pcmC4D0c
It start works if I created these node.