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

[Peter Ujfalusi]

Hi,

On 2018-11-15 14:26, H. Nikolaus Schaller wrote:
> Hi,
> 
>> Am 14.11.2018 um 13:45 schrieb H. Nikolaus Schaller <hns at goldelico.com>:
>>
>> Hi Peter,
>>
>>> Am 14.11.2018 um 12:06 schrieb Peter Ujfalusi <peter.ujfalusi at ti.com>:
>>>
>>> Hi,
>>>
>>> The defconfig for OMAP2+ now have the CPU_IDLE enabled which can cause audio
>>> artifacts because we try to enter too low power state from where the wakeup
>>> takes longer than the FIFO can tolerate on the dai side.
>>>
>>> While adding pm_qos to McPDM and DMIC I have noticed that the McBSP calculation
>>> was not correct as we need usec for the latency value.
>>>
>>> Regards,
>>> Peter
>>> ---
>>> 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

Thanks for testing!

> Sometimes, there is a scratchy tenth of a second (in handsfree and headset),

If you set CONFIG_CPU_IDLE=n, do you still have the scratchy sound? Or
with 4.19 kernel if you can cross check it?

> 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).
> 
> BR and thanks for quick help,
> Nikolaus
> 

- Péter

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