===================================================================
@@ -76,8 +76,9 @@ enum ec_command {
enum {
EC_FLAGS_QUERY_PENDING, /* Query is pending */
EC_FLAGS_GPE_STORM, /* GPE storm detected */
- EC_FLAGS_HANDLERS_INSTALLED /* Handlers for GPE and
+ EC_FLAGS_HANDLERS_INSTALLED, /* Handlers for GPE and
* OpReg are installed */
+ EC_FLAGS_FROZEN, /* Transactions are suspended */
};
/* If we find an EC via the ECDT, we need to keep a ptr to its context */
@@ -291,6 +292,10 @@ static int acpi_ec_transaction(struct ac
if (t->rdata)
memset(t->rdata, 0, t->rlen);
mutex_lock(&ec->lock);
+ if (test_bit(EC_FLAGS_FROZEN, &ec->flags)) {
+ status = -EINVAL;
+ goto unlock;
+ }
if (ec->global_lock) {
status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
if (ACPI_FAILURE(status)) {
@@ -453,6 +458,32 @@ int ec_transaction(u8 command,
EXPORT_SYMBOL(ec_transaction);
+void acpi_ec_suspend_transactions(void)
+{
+ struct acpi_ec *ec = first_ec;
+
+ if (!ec)
+ return;
+
+ mutex_lock(&ec->lock);
+ /* Prevent transactions from being carried out */
+ set_bit(EC_FLAGS_FROZEN, &ec->flags);
+ mutex_unlock(&ec->lock);
+}
+
+void acpi_ec_resume_transactions(void)
+{
+ struct acpi_ec *ec = first_ec;
+
+ if (!ec)
+ return;
+
+ mutex_lock(&ec->lock);
+ /* Allow transactions to be carried out again */
+ clear_bit(EC_FLAGS_FROZEN, &ec->flags);
+ mutex_unlock(&ec->lock);
+}
+
static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data)
{
int result;
===================================================================
@@ -49,6 +49,8 @@ void acpi_early_processor_set_pdc(void);
int acpi_ec_init(void);
int acpi_ec_ecdt_probe(void);
int acpi_boot_ec_enable(void);
+void acpi_ec_suspend_transactions(void);
+void acpi_ec_resume_transactions(void);
/*--------------------------------------------------------------------------
Suspend/Resume
===================================================================
@@ -552,8 +552,17 @@ static void acpi_hibernation_leave(void)
hibernate_nvs_restore();
}
-static void acpi_pm_enable_gpes(void)
+static int acpi_pm_pre_restore(void)
{
+ acpi_disable_all_gpes();
+ acpi_os_wait_events_complete(NULL);
+ acpi_ec_suspend_transactions();
+ return 0;
+}
+
+static void acpi_pm_restore_cleanup(void)
+{
+ acpi_ec_resume_transactions();
acpi_enable_all_runtime_gpes();
}
@@ -565,8 +574,8 @@ static struct platform_hibernation_ops a
.prepare = acpi_pm_prepare,
.enter = acpi_hibernation_enter,
.leave = acpi_hibernation_leave,
- .pre_restore = acpi_pm_disable_gpes,
- .restore_cleanup = acpi_pm_enable_gpes,
+ .pre_restore = acpi_pm_pre_restore,
+ .restore_cleanup = acpi_pm_restore_cleanup,
};
/**
@@ -618,8 +627,8 @@ static struct platform_hibernation_ops a
.prepare = acpi_pm_disable_gpes,
.enter = acpi_hibernation_enter,
.leave = acpi_hibernation_leave,
- .pre_restore = acpi_pm_disable_gpes,
- .restore_cleanup = acpi_pm_enable_gpes,
+ .pre_restore = acpi_pm_pre_restore,
+ .restore_cleanup = acpi_pm_restore_cleanup,
.recover = acpi_pm_finish,
};
#endif /* CONFIG_HIBERNATION */