Message-ID: <5499590.X6jXHfmChQ@kreacher>
Date:   Tue, 20 Aug 2019 23:38:57 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Kristian Klausen <kristian@...usen.dk>
Cc:     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 Tuesday, August 20, 2019 3:29:48 PM CEST Rafael J. Wysocki wrote:
> On Tue, Aug 20, 2019 at 3:10 PM Kristian Klausen <kristian@...usen.dk> wrote:
> >
> > 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.
> 
> Good job, thanks!
> 
> The assumption in there was that the EC GPE would not need to be set
> up for wakeup unless it is needed either by the intel-hid or by the
> intel-vbtn driver.  On your platform it needs to be set up for wakeup
> even though neither of these drivers is in use.
> 
> Let me cut a fix patch and get back to you when it's ready.

The appended patch should help, so please apply it (on top of
v5.3-rc5+pm-s2idle-testing) and test.

---
 drivers/acpi/ec.c                 |    1 -
 drivers/acpi/sleep.c              |   15 +++++++++++++--
 drivers/platform/x86/intel-hid.c  |    5 +----
 drivers/platform/x86/intel-vbtn.c |    5 +----
 4 files changed, 15 insertions(+), 11 deletions(-)

Index: linux-pm/drivers/acpi/sleep.c
===================================================================
--- linux-pm.orig/drivers/acpi/sleep.c
+++ linux-pm/drivers/acpi/sleep.c
@@ -938,6 +938,13 @@ static int lps0_device_attach(struct acp
 	if (mem_sleep_default > PM_SUSPEND_MEM && !acpi_sleep_default_s3)
 		mem_sleep_current = PM_SUSPEND_TO_IDLE;
 
+	/*
+	 * Some LPS0 systems, like ASUS Zenbook UX430UNR/i7-8550U, require the
+	 * EC GPE to be enabled while suspended for certain wakeup devices to
+	 * work, so mark it as wakeup-capable.
+	 */
+	acpi_ec_mark_gpe_for_wake();
+
 	return 0;
 }
 
@@ -954,8 +961,10 @@ static int acpi_s2idle_begin(void)
 
 static int acpi_s2idle_prepare(void)
 {
-	if (acpi_sci_irq_valid())
+	if (acpi_sci_irq_valid()) {
 		enable_irq_wake(acpi_sci_irq);
+		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
+	}
 
 	acpi_enable_wakeup_devices(ACPI_STATE_S0);
 
@@ -1034,8 +1043,10 @@ static void acpi_s2idle_restore(void)
 
 	acpi_disable_wakeup_devices(ACPI_STATE_S0);
 
-	if (acpi_sci_irq_valid())
+	if (acpi_sci_irq_valid()) {
+		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
 		disable_irq_wake(acpi_sci_irq);
+	}
 }
 
 static void acpi_s2idle_end(void)
Index: linux-pm/drivers/platform/x86/intel-hid.c
===================================================================
--- linux-pm.orig/drivers/platform/x86/intel-hid.c
+++ linux-pm/drivers/platform/x86/intel-hid.c
@@ -257,7 +257,6 @@ static int intel_hid_pm_prepare(struct d
 		struct intel_hid_priv *priv = dev_get_drvdata(device);
 
 		priv->wakeup_mode = true;
-		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 	}
 	return 0;
 }
@@ -266,10 +265,8 @@ static void intel_hid_pm_complete(struct
 {
 	struct intel_hid_priv *priv = dev_get_drvdata(device);
 
-	if (priv->wakeup_mode) {
-		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
+	if (priv->wakeup_mode)
 		priv->wakeup_mode = false;
-	}
 }
 
 static int intel_hid_pl_suspend_handler(struct device *device)
Index: linux-pm/drivers/platform/x86/intel-vbtn.c
===================================================================
--- linux-pm.orig/drivers/platform/x86/intel-vbtn.c
+++ linux-pm/drivers/platform/x86/intel-vbtn.c
@@ -205,7 +205,6 @@ static int intel_vbtn_pm_prepare(struct
 		struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
 
 		priv->wakeup_mode = true;
-		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 	}
 	return 0;
 }
@@ -214,10 +213,8 @@ static void intel_vbtn_pm_complete(struc
 {
 	struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
 
-	if (priv->wakeup_mode) {
-		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
+	if (priv->wakeup_mode)
 		priv->wakeup_mode = false;
-	}
 }
 
 static int intel_vbtn_pm_resume(struct device *dev)
Index: linux-pm/drivers/acpi/ec.c
===================================================================
--- linux-pm.orig/drivers/acpi/ec.c
+++ linux-pm/drivers/acpi/ec.c
@@ -1970,7 +1970,6 @@ void acpi_ec_set_gpe_wake_mask(u8 action
 	if (pm_suspend_no_platform() && first_ec && !ec_no_wakeup)
 		acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action);
 }
-EXPORT_SYMBOL_GPL(acpi_ec_set_gpe_wake_mask);
 
 bool acpi_ec_dispatch_gpe(void)
 {

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