[PATCH V2 0/2] Sound support for Exynos4412 Odroid X2, U3 board
s.nawrocki at samsung.com
Mon Jun 23 09:32:46 PDT 2014
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.
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