[PATCH v3 4/8] ACPI: PM: s2idle: Switch EC over to polling during "noirq" suspend

From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux ACPI <linux-acpi@vger.kernel.org>
Cc: Linux PM <linux-pm@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Zhang Rui <rui.zhang@intel.com>,
	Rajneesh Bhardwaj <rajneesh.bhardwaj@linux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Mario Limonciello <mario.limonciello@dell.com>,
	Kai-Heng Feng <kai.heng.feng@canonical.com>
Subject: [PATCH v3 4/8] ACPI: PM: s2idle: Switch EC over to polling during "noirq" suspend
Date: Fri, 02 Aug 2019 12:40:43 +0200	[thread overview]
Message-ID: <2250753.m3tS5N7MJZ@kreacher> (raw)
In-Reply-To: <5997740.FPbUVk04hV@kreacher>

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Since the ACPI SCI is set up for system wakeup before the "noirq"
suspend of devices, it is better to make suspend-to-idle follow
suspend-to-RAM (S3) and switch over the EC to polling during "noirq"
suspend (and back to interrupt-based flow during "noirq" resume).

The frequency of spurious wakeup interrupts from the EC may be
reduced this way.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

In v2 this was patch 5.

---
 drivers/acpi/ec.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

Index: linux-pm/drivers/acpi/ec.c
===================================================================

--- linux-pm.orig/drivers/acpi/ec.c
+++ linux-pm/drivers/acpi/ec.c
@@ -1958,8 +1958,7 @@ static int acpi_ec_suspend_noirq(struct
 	    ec->reference_count >= 1)
 		acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE);
 
-	if (acpi_sleep_no_ec_events())
-		acpi_ec_enter_noirq(ec);
+	acpi_ec_enter_noirq(ec);
 
 	return 0;
 }
@@ -1968,8 +1967,7 @@ static int acpi_ec_resume_noirq(struct d
 {
 	struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev));
 
-	if (acpi_sleep_no_ec_events())
-		acpi_ec_leave_noirq(ec);
+	acpi_ec_leave_noirq(ec);
 
 	if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) &&
 	    ec->reference_count >= 1)



