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firmware loader: cache devices firmware during suspend/resume cycle

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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@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ming Lei 2012-08-04 12:01:29 +08:00 committed by Greg Kroah-Hartman
parent ffe53f6f38
commit 07646d9c09
1 changed files with 32 additions and 0 deletions
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32
drivers/base/firmware_class.c
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@ -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);
}