On the wake-up, the ACPI GPE that are marked as a wakeup source are
turned off. Before turning off, the kernel waits for the currently
processing IRQ to finish and assumes that this is an ACPI interrupt that
triggered wake-up. In the case the first interrupt after wake-up is not
an ACPI interrupt, this might cause the ACPI GPE not to be processed
because it will be disabled.
The patch makes sure that an ACPI interrupt is processed before
disabling GPE that are wakeup sources.
This patch fix the issue that is seen on low-end Chromebooks with two
cores CPU when HPET IRQ is triggered while resuming the device and is
processed before the ACPI GPE interrupt on the same CPU core.
Signed-off-by: Marek Maslanka <mm@xxxxxxxxxxxx>
---
drivers/acpi/internal.h | 2 ++
drivers/acpi/osl.c | 18 ++++++++++++++++++
drivers/acpi/sleep.c | 6 ++++++
include/linux/acpi.h | 2 ++
4 files changed, 28 insertions(+)
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index 219c02df9a08..e4df1bf2963b 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -251,6 +251,8 @@ static inline bool force_storage_d3(void)
}
#endif
+extern bool acpi_resume_gpe_irq_handled;
+
/*--------------------------------------------------------------------------
Device properties
-------------------------------------------------------------------------- */
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 3269a888fb7a..ea587ac4c68a 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -42,6 +42,8 @@
#define _COMPONENT ACPI_OS_SERVICES
ACPI_MODULE_NAME("osl");
+#define ACPI_WAIT_FOR_RESUME_GPE_IRQ_MS 500
+
struct acpi_os_dpc {
acpi_osd_exec_callback function;
void *context;
@@ -69,6 +71,8 @@ static struct workqueue_struct *kacpi_hotplug_wq;
static bool acpi_os_initialized;
unsigned int acpi_sci_irq = INVALID_ACPI_IRQ;
bool acpi_permanent_mmap = false;
+bool acpi_resume_gpe_irq_handled;
+static DECLARE_WAIT_QUEUE_HEAD(acpi_irq_after_suspend_wait);
/*
* This list of permanent mappings is for memory that may be accessed from
@@ -549,6 +553,10 @@ static irqreturn_t acpi_irq(int irq, void *dev_id)
handled = (*acpi_irq_handler) (acpi_irq_context);
if (handled) {
+ if (acpi_s2idle_wakeup()) {
+ acpi_resume_gpe_irq_handled = true;
+ wake_up(&acpi_irq_after_suspend_wait);
+ }
acpi_irq_handled++;
return IRQ_HANDLED;
} else {
@@ -1768,3 +1776,13 @@ acpi_status acpi_os_enter_sleep(u8 sleep_state,
reg_a_value, reg_b_value);
return status;
}
+
+int acpi_wait_for_resume_gpe_irq(void)
+{
+ int wait_ms = msecs_to_jiffies(ACPI_WAIT_FOR_RESUME_GPE_IRQ_MS);
+ int timeout = wait_event_timeout(acpi_irq_after_suspend_wait,
+ acpi_resume_gpe_irq_handled,
+ wait_ms);
+ return timeout;
+}
+EXPORT_SYMBOL(acpi_wait_for_resume_gpe_irq);
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index ad4b2987b3d6..6ddf28067687 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -721,6 +721,7 @@ int acpi_s2idle_prepare(void)
acpi_os_wait_events_complete();
s2idle_wakeup = true;
+ acpi_resume_gpe_irq_handled = false;
return 0;
}
@@ -789,6 +790,7 @@ bool acpi_s2idle_wake(void)
void acpi_s2idle_restore(void)
{
+ int timeout;
/*
* Drain pending events before restoring the working-state configuration
* of GPEs.
@@ -797,6 +799,10 @@ void acpi_s2idle_restore(void)
acpi_ec_flush_work(); /* flush the EC driver's workqueues */
acpi_os_wait_events_complete(); /* synchronize Notify handling */
+ timeout = acpi_wait_for_resume_gpe_irq();
+ if (timeout == 0)
+ pr_warn("Failed to wait for ACPI interrupt after resume");
+
s2idle_wakeup = false;
acpi_enable_all_runtime_gpes();
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index ed4aa395cc49..ef2ab7990f1c 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1475,4 +1475,6 @@ static inline void acpi_device_notify(struct device *dev) { }
static inline void acpi_device_notify_remove(struct device *dev) { }
#endif
+int acpi_wait_for_resume_gpe_irq(void);
+
#endif /*_LINUX_ACPI_H*/
--
2.37.2.789.g6183377224-goog
