linux-kernel - Re: [PATCH 8/9] ASoC: Intel: bytcr_rt5640: Drop unwanted ignore

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Date:   Mon, 5 Mar 2018 14:50:10 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Mark Brown <broonie@...nel.org>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/9] ASoC: Intel: bytcr_rt5640: Drop unwanted
 ignore_suspend settings

Hi,

On 04-03-18 15:11, Hans de Goede wrote:
> Hi,
> 
> On 01-03-18 18:17, Mark Brown wrote:
>> On Thu, Mar 01, 2018 at 05:58:35PM +0100, Hans de Goede wrote:
>>> On 01-03-18 17:48, Mark Brown wrote:
>>
>>>> That sounds like what's missing is hookup of whatever the DSP uses to
>>>> wake the system when it's getting to the bottom of the buffer?  That's
>>>> the normal way this stuff is implemented anyway.
>>
>>> I'm afraid there is a lot more missing, at least from a standard Linux
>>> distro pov, just waking up is not enough, we need to also wakeup
>>> userspace to get the mp3-player (or whatever) to refill the buffer,
>>> but preferably without waking up the GPU, turning on the screen, etc.
>>
>>> AFAIK support for this is currently completely missing, standard Linux
>>> userspace currently treats suspend-2-idle as a a full suspend and any
>>> wakeup as a full wakeup.
>>
>> Sure, but do such userspaces exist - ChromeOS or something for example?
> 
> ChromeOS has a more or less standard userspace I believe.
> 
>>> So AFAICT currently the ignore-suspend flag is currently not useful
>>> and as the commit message mentions IIRC there were added to fix some
>>> issues with suspend/resume in the past.
>>
>> Is it possible the issue was playback during suspend?
> 
> There was an issue with suspend being blocked (so the machine not suspending)
> if audio was playing because of one the suspend callbacks returning
> an error. I believe the ignore_suspend settings where added as a workaround
> for that and that is no longer a problem.

To be precise (I just got a bugzilla email because someone added a
comment) I believe the ignore_suspend settings were added in an
attempt to fix / workaround this bug:

https://bugzilla.kernel.org/show_bug.cgi?id=111481

And not to allow audio to keep playing while suspended.

Regards,

Hans