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path: root/drivers/acpi/sleep.c
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Diffstat (limited to 'drivers/acpi/sleep.c')
-rw-r--r--drivers/acpi/sleep.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index f054cadf3..2a8b59644 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -19,6 +19,7 @@
#include <linux/reboot.h>
#include <linux/acpi.h>
#include <linux/module.h>
+#include <linux/syscore_ops.h>
#include <asm/io.h>
#include <trace/events/power.h>
@@ -677,6 +678,39 @@ static void acpi_sleep_suspend_setup(void)
static inline void acpi_sleep_suspend_setup(void) {}
#endif /* !CONFIG_SUSPEND */
+#ifdef CONFIG_PM_SLEEP
+static u32 saved_bm_rld;
+
+static int acpi_save_bm_rld(void)
+{
+ acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &saved_bm_rld);
+ return 0;
+}
+
+static void acpi_restore_bm_rld(void)
+{
+ u32 resumed_bm_rld = 0;
+
+ acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_RLD, &resumed_bm_rld);
+ if (resumed_bm_rld == saved_bm_rld)
+ return;
+
+ acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_RLD, saved_bm_rld);
+}
+
+static struct syscore_ops acpi_sleep_syscore_ops = {
+ .suspend = acpi_save_bm_rld,
+ .resume = acpi_restore_bm_rld,
+};
+
+void acpi_sleep_syscore_init(void)
+{
+ register_syscore_ops(&acpi_sleep_syscore_ops);
+}
+#else
+static inline void acpi_sleep_syscore_init(void) {}
+#endif /* CONFIG_PM_SLEEP */
+
#ifdef CONFIG_HIBERNATION
static unsigned long s4_hardware_signature;
static struct acpi_table_facs *facs;
@@ -840,6 +874,7 @@ int __init acpi_sleep_init(void)
sleep_states[ACPI_STATE_S0] = 1;
+ acpi_sleep_syscore_init();
acpi_sleep_suspend_setup();
acpi_sleep_hibernate_setup();