PM / mfd: intel-lpss: Use DPM_FLAG_SMART_SUSPEND

Make the intel-lpss driver set DPM_FLAG_SMART_SUSPEND for its
devices which will allow them to stay in runtime suspend during
system suspend unless they need to be reconfigured for some reason.

Also make it avoid resuming its child devices if they have
DPM_FLAG_SMART_SUSPEND set to allow them to remain in runtime
suspend during system suspend.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-for-MFD-by: Lee Jones <lee.jones@linaro.org>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>

diff --git a/drivers/mfd/intel-lpss.c b/drivers/mfd/intel-lpss.c
index 0e0ab9bb15305d895e082e479ef3f86922c71d33..9e545eb6e8b4aa2fe018c5c4b3a622728f0cf713 100644 (file)
--- a/drivers/mfd/intel-lpss.c
+++ b/drivers/mfd/intel-lpss.c
@@ -450,6 +450,8 @@ int intel_lpss_probe(struct device *dev,
        if (ret)
                goto err_remove_ltr;
 
+       dev_pm_set_driver_flags(dev, DPM_FLAG_SMART_SUSPEND);
+
        return 0;
 
 err_remove_ltr:
@@ -478,7 +480,9 @@ EXPORT_SYMBOL_GPL(intel_lpss_remove);
 
 static int resume_lpss_device(struct device *dev, void *data)
 {
-       pm_runtime_resume(dev);
+       if (!dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND))
+               pm_runtime_resume(dev);
+
        return 0;
 }