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 <[email protected]> --- drivers/base/power/main.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 205a06752ca9..be6744bdfc93 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -442,9 +442,9 @@ static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t stat 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, -- 2.17.1
