diff options
| author | Ming Lei <ming.lei@canonical.com> | 2012-08-04 08:01:29 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-17 00:44:44 +0400 |
| commit | 07646d9c0938d40b943c592dd1c6435ab24c4e2f (patch) | |
| tree | 1b86d489f25f22d60dc29467c4b8aae727dbc72d /drivers/base | |
| parent | ffe53f6f388a3aaa208e7c45065ce096d5d2f4e9 (diff) | |
| download | linux-07646d9c0938d40b943c592dd1c6435ab24c4e2f.tar.xz | |
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@canonical.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/firmware_class.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 8ca00524d58f..5bd2100a4dcf 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); } |