From: James Hogan <james.hogan@xxxxxxxxxx>
Implement a CPU power management callback for the r4k cache, to set up
coherency again after leaving a powered down state.
Signed-off-by: James Hogan <james.hogan@xxxxxxxxxx>
Signed-off-by: Paul Burton <paul.burton@xxxxxxxxxx>
---
arch/mips/mm/c-r4k.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/arch/mips/mm/c-r4k.c b/arch/mips/mm/c-r4k.c
index 1c74a6a..a2a71c5 100644
--- a/arch/mips/mm/c-r4k.c
+++ b/arch/mips/mm/c-r4k.c
@@ -7,6 +7,7 @@
* Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Ralf Baechle (ralf@xxxxxxx)
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
*/
+#include <linux/cpu_pm.h>
#include <linux/hardirq.h>
#include <linux/init.h>
#include <linux/highmem.h>
@@ -1644,3 +1645,26 @@ void r4k_cache_init(void)
coherency_setup();
board_cache_error_setup = r4k_cache_error_setup;
}
+
+static int r4k_cache_pm_notifier(struct notifier_block *self, unsigned long cmd,
+ void *v)
+{
+ switch (cmd) {
+ case CPU_PM_ENTER_FAILED:
+ case CPU_PM_EXIT:
+ coherency_setup();
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block r4k_cache_pm_notifier_block = {
+ .notifier_call = r4k_cache_pm_notifier,
+};
+
+int __init r4k_cache_init_pm(void)
+{
+ return cpu_pm_register_notifier(&r4k_cache_pm_notifier_block);
+}
+arch_initcall(r4k_cache_init_pm);
--
1.8.5.3
