Currently there are 4 driver flags to control system suspend/resume
behavior: DPM_FLAG_NO_DIRECT_COMPLETE, DPM_FLAG_SMART_PREPARE,
DPM_FLAG_SMART_SUSPEND and DPM_FLAG_MAY_SKIP_RESUME.
Print these flags during suspend/resume so as to get a brief
understanding of the expected behavior of each device, and to
facilitate suspend/resume debugging/tuning.
To enable this tracing:
echo 'file drivers/base/power/main.c +p' >
/sys/kernel/debug/dynamic_debug/control
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
static void pm_dev_dbg(struct device *dev, pm_message_t state, const char *info)
{
- dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
+ dev_dbg(dev, "%s%s%s driver flags: %x\n", info, pm_verb(state.event),
((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
- ", may wakeup" : "");
+ ", may wakeup" : "", dev->power.driver_flags);
}
static void pm_dev_err(struct device *dev, pm_message_t state, const char *info,