From: s.nawrocki@samsung•com (Sylwester Nawrocki)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH V2 0/2] Sound support for Exynos4412 Odroid X2, U3 board
Date: Mon, 23 Jun 2014 18:32:46 +0200 [thread overview]
Message-ID: <53A856AE.1030202@samsung.com> (raw)
In-Reply-To: <CAD8Lp44h6zc2Rt2MGLjhmNG-YB0kYCWf5G7hX5JmdmBfc1PvKg@mail.gmail.com>
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
next prev parent reply other threads:[~2014-06-23 16:32 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-18 16:22 [PATCH V2 0/2] Sound support for Exynos4412 Odroid X2, U3 board Sylwester Nawrocki
2014-06-18 16:22 ` [PATCH V2 1/2] ASoC: samsung: Add machine driver for Odroid X2/U3 Sylwester Nawrocki
2014-06-25 3:31 ` [alsa-devel] " Tushar Behera
2014-06-26 8:47 ` Sylwester Nawrocki
2014-06-30 18:46 ` Mark Brown
2014-07-14 11:27 ` Sylwester Nawrocki
2014-07-14 11:31 ` Mark Brown
2014-06-18 16:22 ` [PATCH V2 2/2] doc: dt bindings: Document Odroid X2/U3 audio subsystem bindings Sylwester Nawrocki
2014-06-23 9:40 ` [PATCH V2 0/2] Sound support for Exynos4412 Odroid X2, U3 board Daniel Drake
2014-06-23 16:32 ` Sylwester Nawrocki [this message]
2014-06-23 16:53 ` Sylwester Nawrocki
2014-06-24 8:35 ` Daniel Drake
2014-06-24 9:02 ` Marek Szyprowski
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