linux-kernel - Re: [PATCH 19/19] ASoC: amd: ps: increase runtime suspend delay

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Message-ID: <625915d5-0c2a-ce63-e71b-ff4f4f2c6d07@linux.intel.com>
Date:   Tue, 17 Jan 2023 05:51:03 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     "Mukunda,Vijendar" <vijendar.mukunda@....com>,
        Mark Brown <broonie@...nel.org>
Cc:     "Limonciello, Mario" <mario.limonciello@....com>, vkoul@...nel.org,
        alsa-devel@...a-project.org, Mastan.Katragadda@....com,
        Sunil-kumar.Dommati@....com, Basavaraj.Hiregoudar@....com,
        Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Syed Saba Kareem <Syed.SabaKareem@....com>,
        arungopal.kondaveeti@....com
Subject: Re: [PATCH 19/19] ASoC: amd: ps: increase runtime suspend delay



On 1/17/23 05:33, Mukunda,Vijendar wrote:
> On 16/01/23 20:32, Pierre-Louis Bossart wrote:
>>
>> On 1/16/23 02:35, Mukunda,Vijendar wrote:
>>> On 14/01/23 01:27, Mark Brown wrote:
>>>> On Fri, Jan 13, 2023 at 11:33:09AM -0600, Pierre-Louis Bossart wrote:
>>>>
>>>>> I do recall some issues with the codec jacks, where if the card
>>>>> registration happens too late the codec might have suspended. But we
>>>>> added pm_runtime_resume_and_get in the set_jack_detect callbacks, so
>>>>> that was solved.
>>>> Right, I would expect that whatever needs the device to be powered on
>>>> would be explicitly ensuring that this is done rather than tweaking
>>>> timeouts - the timeouts should be more of a performance thing to avoid
>>>> bouncing power too much, not a correctness thing.
>>> Machine driver probe is executed in parallel with Manager driver
>>> probe sequence. Because of it, before completion of all peripherals
>>> enumeration across the multiple links, if card registration is
>>> completed, codec register writes will fail as Codec device numbers
>>> are not assigned.
>>>
>>> If we understood correctly, as per your suggestion, We shouldn't use any
>>> time bounds in machine driver probe sequence and before registering the
>>> sound card, need to traverses through all peripheral initialization completion
>>> status for all the managers.
>> What's not clear in your reply is this:
>>
>> What codec registers are accessed as a result of the machine driver
>> probe and card registration, and in what part of the card registration?
>>
>> Are we talking about SoundWire 'standard' registers for device/port
>> management, about vendor specific ones that are exposed to userspace, or
>> vendor-specific ones entirely configured by the driver/regmap.
>>
>> You've got to give us more data or understanding of the sequence to
>> help. Saying there's a race condition doesn't really help if there's
>> nothing that explains what codec registers are accessed and when.
> We have come across a race condition, where sound card registration
> is successful before codec enumerations across all the links gets completed
> and our manager instance going into bad state.
> 
> Please refer below link for error logs.
> https://pastebin.com/ZYEN928S

You have two RT1316 register areas that are accessed while the codec is
not even enumerated:

[    2.755828] rt1316-sdca sdw:0:025d:1316:01:0: ASoC: error at
snd_soc_component_update_bits on sdw:0:025d:1316:01:0 for register:
[0x41080100] -22

[    2.758904] rt1316-sdca sdw:0:025d:1316:01:0: ASoC: error at
snd_soc_component_update_bits on sdw:0:025d:1316:01:0 for register:
[0x00003004] -110

The last one is clearly listed in the regmap list.

You probably want to reverse-engineer what causes these accesses.
I see this suspicious kcontrol definition that might be related:

	SOC_SINGLE("Left I Tag Select", 0x3004, 4, 7, 0),