[alsa-devel] [PATCH 0/3] ASoC: omap: Fix and add pm_qos configuration

[Peter Ujfalusi]

On 2018-11-18 19:04, Jarkko Nikula wrote:
> On 11/15/18 2:26 PM, H. Nikolaus Schaller wrote:
>>>> Peter Ujfalusi (3):
>>>> ASoC: omap-mcbsp: Fix latency value calculation for pm_qos
>>>> ASoC: omap-mcpdm: Add pm_qos handling to avoid under/overruns with
>>>> CPU_IDLE
>>>> ASoC: omap-dmic: Add pm_qos handling to avoid overruns with CPU_IDLE
>>>>
>>>> sound/soc/omap/omap-dmic.c  |  9 ++++++++
>>>> sound/soc/omap/omap-mcbsp.c |  6 +++---
>>>> sound/soc/omap/omap-mcpdm.c | 43 ++++++++++++++++++++++++++++++++++++-
>>>> 3 files changed, 54 insertions(+), 4 deletions(-)
>>>
>>> I will test asap.
>>
>> I have now:
>>
>> * v4.20-rc2
>> * plus your new patches
>> * plus letux-4.20-rc2 patches
>> * including our private AESS patch set (mostly inactive, because it fails to load firmware)
>> * CONFIG_CPU_IDLE=y
>>
>> and it works. I can use aplay and play to get handsfree audio as with CONFIG_CPU_IDLE=n
>>
>> Sometimes, there is a scratchy tenth of a second (in handsfree and headset),
>> but the basic rhythm does not get interrupted any more and the play command does
>> not get stuck.
>>
>> I have played an mp3 of 4 minutes and the play process did succeed and didn't report
>> buffer underrun issues.
>>
>> So your patches seem to fix the issue. At least the basic problems. This scratchy
>> thing needs further study, if it is a spurious thing on my Pyra protoype device.
>> Or if it is still there if we disable CPU_IDLE again (I haven't tried that yet).
>>
> Peter: do you have some simple test case for N810 or N900? I tried to
> play with a few different aplay --buffer-size and --period-size
> combinations to see can I hit this. N810 most probably wasn't able to
> hit deep enough idle as the display is on due there is no driver for it.
> On N900 I have display blanked.

If you have CPU_IDLE enabled (it should be by default) and you don't
experience any crackling than it is working OK.

Tony: or is there something else to look for in OMAP2/3 ?

> I have one educational question on 1/3 but no any show stoppers. For all
> three:
> 
> Acked-by: Jarkko Nikula <jarkko.nikula at bitmer.com>
> 

- Péter

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