Hi,
In the modified cht-bsw_rt5645 machine driver for Asus X205TA and
T100HA, I disable the audio mclk with a call to clk_disable_unprepare()
when I see a SND_SOC_DAPM_EVENT_OFF event in the platform_clock_control
hook.
For some reason I seem to get multiple SND_SOC_DAPM_EVENT_OFF events and
the clock framework complains with dmesg warnings that the refcount is
already zero (which has no functional side effect).
WARNING: CPU: 0 PID: 2002 at drivers/clk/clk.c:476 clk_unprepare+0x1a/0x21
WARNING: CPU: 2 PID: 2095 at drivers/clk/clk.c:594
clk_core_disable_lock+0x12/0x1b
I could fix this in three different ways:
- remove multiple SND_SOC_DAPM_EVENT_OFF events (not sure what the root
cause is, maybe issues with jack detection?)
- call a clk_is_enabled() or clk_refcount() function before calling
clk_disable_unprepare() (but they don't seem to exist in
include/linux/clk.h)
- count the references myself (which does exactly the same as what the
clk framework already does so it's not terribly elegant)
Any suggestions on what the least-bad solution might be?
Thanks
-Pierre
_______________________________________________
Alsa-devel mailing list
Alsa-devel@xxxxxxxxxxxxxxxx
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
