Date:   Tue, 20 Aug 2019 15:10:34 +0200
From:   Kristian Klausen <kristian@...usen.dk>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mario Limonciello <mario.limonciello@...l.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: Re: [PATCH v3 0/8] PM / ACPI: sleep: Additional changes related to
 suspend-to-idle

On 19.08.2019 22.41, Rafael J. Wysocki wrote:
> On Mon, Aug 19, 2019 at 5:47 PM Kristian Klausen <kristian@...usen.dk> wrote:
>> On 19.08.2019 11.05, Rafael J. Wysocki wrote:
>>> On Monday, August 19, 2019 9:59:02 AM CEST Rafael J. Wysocki wrote:
>>>> On Fri, Aug 16, 2019 at 10:26 PM Kristian Klausen <kristian@...usen.dk> wrote:
>>>>> On 02.08.2019 12.33, Rafael J. Wysocki wrote:
>>>>>> Hi All,
>>>>>>
>>>>>>>> On top of the "Simplify the suspend-to-idle control flow" patch series
>>>>>>>> posted previously:
>>>>>>>>
>>>>>>>> https://lore.kernel.org/lkml/71085220.z6FKkvYQPX@kreacher/
>>>>>>>>
>>>>>>>> sanitize the suspend-to-idle flow even further.
>>>>>>>>
>>>>>>>> First off, decouple EC wakeup from the LPS0 _DSM processing (patch 1).
>>>>>>>>
>>>>>>>> Next, reorder the code to invoke LPS0 _DSM Functions 5 and 6 in the
>>>>>>>> specification-compliant order with respect to suspending and resuming
>>>>>>>> devices (patch 2).
>>>>>>>>
>>>>>>>> Finally, rearrange lps0_device_attach() (patch 3) and add a command line
>>>>>>>> switch to prevent the LPS0 _DSM from being used.
>>>>>>> The v2 is because I found a (minor) bug in patch 1, decided to use a module
>>>>>>> parameter instead of a kernel command line option in patch 4.  Also, there
>>>>>>> are 4 new patches:
>>>>>>>
>>>>>>> Patch 5: Switch the EC over to polling during "noirq" suspend and back
>>>>>>> during "noirq" resume.
>>>>>>>
>>>>>>> Patch 6: Eliminate acpi_sleep_no_ec_events().
>>>>>>>
>>>>>>> Patch 7: Consolidate some EC code depending on PM_SLEEP.
>>>>>>>
>>>>>>> Patch 8: Add EC GPE dispatching debug message.
>>>>>> The v3 is just a rearranged v2 so as to move the post sensitive patch (previous patch 2)
>>>>>> to the end of the series.   [After applying the full series the code is the same as before.]
>>>>>>
>>>>>> For easier testing, the series (along with some previous patches depended on by it)
>>>>>> is available in the pm-s2idle-testing branch of the linux-pm.git tree at kernel.org:
>>>>>>
>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/log/?h=pm-s2idle-testing
>>>>> It was just testing this patch series(461fc1caed55), to see if it would
>>>>> fix my charging issue
>>>>> (https://bugzilla.kernel.org/show_bug.cgi?id=201307), which it didn't.
>>>> It is unlikely to help in that case.
>> Do you have any idea what the issue could be?
> Basically, there are two possibilities: either the OS is expected to
> handle the AC/battery switching events, or the platform firmware
> should take care of them.  In the former case, the EC should generate
> events to be handled by the OS and in the latter one there needs to be
> a way to let the platform firmware that it needs to take care of those
> events going forward.
>
> In either case there may be a platform-specific action to be carried
> out during suspend and resume to set this up as expected which may be
> missing.
Thanks for the explanation. I don't think I have the expertise to solve 
the issue, but at least now I'm one step closer.
>
>>>>> I did however notice that my laptop (ASUS Zenbook UX430UNR/i7-8550U)
>>>>> won't wake when opening the lid or pressing a key, the only way to wake
>>>>> the laptop is pressing the power button.
>>>>>
>>>>> I also tested mainline (5.3.0-rc4 b7e7c85dc7b0) and 5.2.8 and the laptop
>>>>> wakes without issue when the lid is opened or a key is presed.
>>>>>> Please refer to the changelogs for details.
>>>> Thanks for your report.
>>>>
>>>> I seem to see a similar issue with respect to the lid on one of my
>>>> test machines, looking into it right now.
>>> Well, my lid issue seems to be unrelated as it doesn't result from any patches in the
>>> series in question.
>>>
>>> First off, please clone 5.3-rc5 from kernel.org and double check if the issue is not
>>> present in that one.
>>>
>>> If that's not the case, merge the pm-s2idle-rework branch from my tree on top of it
>>> and retest.
>>>
>>> If you still see the issue then, apply the appended patch (on top of the pm-s2idle-reqork
>>> branch ) and, after starting the kernel, do
>>>
>>> # echo 1 > /sys/power/pm_debug_messages
>>>
>>> suspend the system and try to wake it up through all of the ways that stopped working.
>>>
>>> Then, wake it up with the power button, save the output of dmesg and send it to me.
>>>
>>> Thanks!
>> With 5.3-rc5 the laptops wakes up without any issue when pressing a key
>> or opening the lid.
>> With v5.3-rc5+pm-s2idle-testing I can only wake the laptop by pressing
>> the power button.
> OK, thanks for verifying.
>
> So it is unclear to me how the series can cause an issue like that to appear.
>
>> dmesg with pm_debug_messages=1 and your patch:
>> [   55.646109] PM: suspend entry (s2idle)
>> [   55.698559] Filesystems sync: 0.052 seconds
>> [   55.698561] PM: Preparing system for sleep (s2idle)
>> [   55.700661] Freezing user space processes ... (elapsed 0.210 seconds)
>> done.
>> [   55.911494] OOM killer disabled.
>> [   55.911495] Freezing remaining freezable tasks ... (elapsed 0.001
>> seconds) done.
>> [   55.913192] PM: Suspending system (s2idle)
>> [   55.913195] printk: Suspending console(s) (use no_console_suspend to
>> debug)
>> [   55.914778] [drm] CT: disabled
>> [   55.916057] wlan0: deauthenticating from 64:70:02:a5:fd:02 by local
>> choice (Reason: 3=DEAUTH_LEAVING)
>> [   56.045634] sd 2:0:0:0: [sda] Synchronizing SCSI cache
>> [   56.046650] sd 2:0:0:0: [sda] Stopping disk
>> [   56.287622] PM: suspend of devices complete after 371.285 msecs
>> [   56.287627] PM: start suspend of devices complete after 373.684 msecs
>> [   56.307155] PM: late suspend of devices complete after 19.477 msecs
>> [   56.312479] ACPI: EC: interrupt blocked
>> [   56.352761] PM: noirq suspend of devices complete after 45.205 msecs
>> [   56.352770] ACPI: \_PR_.PR00: LPI: Device not power manageable
>> [   56.352774] ACPI: \_PR_.PR01: LPI: Device not power manageable
>> [   56.352776] ACPI: \_PR_.PR02: LPI: Device not power manageable
>> [   56.352779] ACPI: \_PR_.PR03: LPI: Device not power manageable
>> [   56.352782] ACPI: \_PR_.PR04: LPI: Device not power manageable
>> [   56.352785] ACPI: \_PR_.PR05: LPI: Device not power manageable
>> [   56.352788] ACPI: \_PR_.PR06: LPI: Device not power manageable
>> [   56.352790] ACPI: \_PR_.PR07: LPI: Device not power manageable
>> [   56.352793] ACPI: \_SB_.PCI0.GFX0: LPI: Device not power manageable
>> [   56.352800] ACPI: \_SB_.PCI0.RP06.PXSX: LPI: Device not power manageable
>> [   56.357057] PM: suspend-to-idle
>> [   69.338656] PM: Timekeeping suspended for 12.178 seconds
>> [   69.338701] PM: irq_pm_check_wakeup: IRQ 9
>> [   69.338704] PM: IRQ wakeup: IRQ 9
> This clearly is the power button event causing the system to wake up.
> The other actions, whatever they were, didn't cause any interrupts to
> be triggered.
>
> I suspect that the issue is related to the EC, so please try to revert commit
>
> fcd0a04267ac ACPI: PM: s2idle: Switch EC over to polling during "noirq" suspend
>
> and see if that makes any difference (should revert cleanly).
>
> If that doesn't make any difference, please also try to revert commits
> (on top of the above revert)
>
> 11f26633cccb PM: suspend: Fix platform_suspend_prepare_noirq()
> ac9eafbe930a ACPI: PM: s2idle: Execute LPS0 _DSM functions with
> suspended devices
>
> (in this order) and retest.
Reverting the following commits, didn't fix the issue:
fcd0a04267ac ACPI: PM: s2idle: Switch EC over to polling during "noirq" 
suspend
6e86633a791f ACPI: PM: s2idle: Eliminate acpi_sleep_no_ec_events()
11f26633cccb PM: suspend: Fix platform_suspend_prepare_noirq()
ac9eafbe930a ACPI: PM: s2idle: Execute LPS0 _DSM functions with 
suspended devices

I didn't bother reverting all the commits, so I did a checkout of:
b605c44c30b5 PM: sleep: Drop dpm_noirq_begin() and dpm_noirq_end()
and everything works, then I did a checkout of:
10a08fd65ec1 ACPI: PM: Set up EC GPE for system wakeup from drivers that 
need it
and the laptop won't wake when opening the lid or pressing a key.

So 10a08fd65ec1 must be the culprit.

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