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[RFC PATCH v1 14/15] firmware loader: cache devices firmware during suspend/resume cycle

 

 

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ming.lei at canonical

Aug 3, 2012, 9:01 PM

Post #1 of 1 (81 views)
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[RFC PATCH v1 14/15] firmware loader: cache devices firmware during suspend/resume cycle

This patch implements caching devices' firmware automatically
during system syspend/resume cycle, so any device drivers can
call request_firmware or request_firmware_nowait inside resume
path to get the cached firmware if they have loaded firmwares
successfully at least once before entering suspend.

Signed-off-by: Ming Lei <ming.lei [at] canonical>
---
drivers/base/firmware_class.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)

diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 8ca0052..5bd2100 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -24,6 +24,7 @@
#include <linux/list.h>
#include <linux/async.h>
#include <linux/pm.h>
+#include <linux/suspend.h>

#include "base.h"
#include "power/power.h"
@@ -108,6 +109,8 @@ struct firmware_cache {
wait_queue_head_t wait_queue;
int cnt;
struct delayed_work work;
+
+ struct notifier_block pm_notify;
};

struct firmware_buf {
@@ -1217,6 +1220,31 @@ static void device_uncache_fw_images_delay(unsigned long delay)
msecs_to_jiffies(delay));
}

+#ifdef CONFIG_PM
+static int fw_pm_notify(struct notifier_block *notify_block,
+ unsigned long mode, void *unused)
+{
+ switch (mode) {
+ case PM_HIBERNATION_PREPARE:
+ case PM_SUSPEND_PREPARE:
+ device_cache_fw_images();
+ break;
+
+ case PM_POST_SUSPEND:
+ case PM_POST_HIBERNATION:
+ case PM_POST_RESTORE:
+ device_uncache_fw_images_delay(10 * MSEC_PER_SEC);
+ break;
+ }
+
+ return 0;
+}
+#else
+static int fw_pm_notify(struct notifier_block *notify_block,
+ unsigned long mode, void *unused)
+{}
+#endif
+
static void __init fw_cache_init(void)
{
spin_lock_init(&fw_cache.lock);
@@ -1229,6 +1257,9 @@ static void __init fw_cache_init(void)
init_waitqueue_head(&fw_cache.wait_queue);
INIT_DELAYED_WORK(&fw_cache.work,
device_uncache_fw_images_work);
+
+ fw_cache.pm_notify.notifier_call = fw_pm_notify;
+ register_pm_notifier(&fw_cache.pm_notify);
}

static int __init firmware_class_init(void)
@@ -1239,6 +1270,7 @@ static int __init firmware_class_init(void)

static void __exit firmware_class_exit(void)
{
+ unregister_pm_notifier(&fw_cache.pm_notify);
class_unregister(&firmware_class);
}

--
1.7.9.5

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