ACPI / EC: Add PM operations for suspend/resume noirq stage

It is reported that on some platforms, resume speed is not fast. The cause
is: in noirq stage, EC driver is working in polling mode, and each state
machine advancement requires a context switch.

The context switch is not necessary to the EC driver's polling mode. This
patch implements PM hooks to automatically switch the driver to/from the
busy polling mode to eliminate the overhead caused by the context switch.

This finally contributes to the tuning result: acpi_pm_finish() execution
time is improved from 192ms to 6ms.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Reported-and-tested-by: Todd E Brandt <todd.e.brandt@linux.intel.com>
[ rjw: Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

2 files changed, 55 insertions, 0 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index e7bd57cc550a..6f6c7d1eaf8c 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1619,6 +1619,58 @@ error:
         return ret;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static void acpi_ec_enter_noirq(struct acpi_ec *ec)
+{
+        unsigned long flags;
+
+        if (ec == first_ec) {
+                spin_lock_irqsave(&ec->lock, flags);
+                ec->saved_busy_polling = ec_busy_polling;
+                ec->saved_polling_guard = ec_polling_guard;
+                ec_busy_polling = true;
+                ec_polling_guard = 0;
+                ec_log_drv("interrupt blocked");
+                spin_unlock_irqrestore(&ec->lock, flags);
+        }
+}
+
+static void acpi_ec_leave_noirq(struct acpi_ec *ec)
+{
+        unsigned long flags;
+
+        if (ec == first_ec) {
+                spin_lock_irqsave(&ec->lock, flags);
+                ec_busy_polling = ec->saved_busy_polling;
+                ec_polling_guard = ec->saved_polling_guard;
+                ec_log_drv("interrupt unblocked");
+                spin_unlock_irqrestore(&ec->lock, flags);
+        }
+}
+
+static int acpi_ec_suspend_noirq(struct device *dev)
+{
+        struct acpi_ec *ec =
+                acpi_driver_data(to_acpi_device(dev));
+
+        acpi_ec_enter_noirq(ec);
+        return 0;
+}
+
+static int acpi_ec_resume_noirq(struct device *dev)
+{
+        struct acpi_ec *ec =
+                acpi_driver_data(to_acpi_device(dev));
+
+        acpi_ec_leave_noirq(ec);
+        return 0;
+}
+#endif
+
+static const struct dev_pm_ops acpi_ec_pm = {
+        SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq)
+};
+
 static int param_set_event_clearing(const char *val, struct kernel_param *kp)
 {
         int result = 0;
@@ -1664,6 +1716,7 @@ static struct acpi_driver acpi_ec_driver = {
                 .add = acpi_ec_add,
                 .remove = acpi_ec_remove,
                 },
+        .drv.pm = &acpi_ec_pm,
 };
 
 static inline int acpi_ec_query_init(void)
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 940218ff0193..6996121ee003 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -174,6 +174,8 @@ struct acpi_ec {
         struct work_struct work;
         unsigned long timestamp;
         unsigned long nr_pending_queries;
+        bool saved_busy_polling;
+        unsigned int saved_polling_guard;
 };
 
 extern struct acpi_ec *first_ec;