[PATCH V2 0/2] Sound support for Exynos4412 Odroid X2, U3 board

On 23/06/14 11:40, Daniel Drake wrote:

I tested ODROID-U2's 3.5mm analog headphone jack output with:

# speaker-test -c 2 -t wav -l 2

On my x86 laptop this command takes ~6 seconds and produces audible output:
"Front left, front right, front left, front right"

When those words are reproduced over the speakers, there is a
corresponding message printed to stdout which synchronizes nicely.

On ODROID-U2 the same command doesn't work quite right - execution
takes only 3.5 seconds and the audible output is truncated:
"Front left, front right, front"
and the stdout messages do not really coincide with the audio being
reproduced at that time.

No pulseaudio or anything like that.

Can you reproduce this?

I could reproduce such behaviour on the U3 board, but only with u-boot
which sets the MPLL clock frequency (fout_mpll) to 880 MHz, rather
than 800 MHz, which was the case in my original environment.
All fout_mpll child clocks have then different frequency values
in both cases.
It's a bit strange though, because frequencies of all the audio
subsystem clocks seem to be same anyway:

# cat /sys/kernel/debug/clk/clk_summary
    ...
    fout_epll                   0           0            192000000
       mout_audss               0           0            192000000
          dout_rp               0           0            19200000
             dout_aud_bus       0           0            19200000
          mout_i2s0             0           0            192000000
             dout_i2s0          0           0            192000000
       sclk_epll                0           0            192000000
          audss                 0           0            192000000

So there might be some other difference I'm overlooking.
Will let you know as soon I find out anything else.

Regards,
Sylwester