ACPI: PM: s2idle: Always set up EC GPE for system wakeup

Commit 10a08fd6 ("ACPI: PM: Set up EC GPE for system wakeup from
drivers that need it") assumed that the EC GPE would only need to be
set up for system wakeup if either the intel-hid or the intel-vbtn
driver was in use, but that turns out to be incorrect.  In particular,
on ASUS Zenbook UX430UNR/i7-8550U, if the EC GPE is not enabled while
suspended, the system cannot be woken up by opening the lid or
pressing a key, and that machine doesn't use any of the drivers
mentioned above.

For this reason, always set up the EC GPE for system wakeup from
suspend-to-idle by setting and clearing its wake mask in the ACPI
suspend-to-idle callbacks.

Fixes: 10a08fd6 ("ACPI: PM: Set up EC GPE for system wakeup from drivers that need it")
Reported-by: Kristian Klausen <kristian@klausen.dk>
Tested-by: Kristian Klausen <kristian@klausen.dk>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

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)
 {

drivers/acpi/sleep.c

@@ -938,6 +938,13 @@ static int lps0_device_attach(struct acpi_device *adev,
 	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)

drivers/platform/x86/intel-hid.c

@@ -257,7 +257,6 @@ static int intel_hid_pm_prepare(struct device *device)
 		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 +265,7 @@ static void intel_hid_pm_complete(struct device *device)
 {
 	struct intel_hid_priv *priv = dev_get_drvdata(device);
 
-	if (priv->wakeup_mode) {
-		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
-		priv->wakeup_mode = false;
-	}
+	priv->wakeup_mode = false;
 }
 
 static int intel_hid_pl_suspend_handler(struct device *device)

drivers/platform/x86/intel-vbtn.c

@@ -205,7 +205,6 @@ static int intel_vbtn_pm_prepare(struct device *dev)
 		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 +213,7 @@ static void intel_vbtn_pm_complete(struct device *dev)
 {
 	struct intel_vbtn_priv *priv = dev_get_drvdata(dev);
 
-	if (priv->wakeup_mode) {
-		acpi_ec_set_gpe_wake_mask(ACPI_GPE_DISABLE);
-		priv->wakeup_mode = false;
-	}
+	priv->wakeup_mode = false;
 }
 
 static int intel_vbtn_pm_resume(struct device *dev)