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Wysocki wrote: ... >>>> So are the devices in question "async"? To check this, please see the >>>> "async" attribute in the "power" subdirectory of the sysfs device >>>> directory for each of them. >>> >>> I checked for both the I2C controller and ina3221 and don't see any >>> 'async' files ... >>> >>> $ ls /sys/class/i2c-dev/i2c-2/device/2-0040/power/ >>> autosuspend_delay_ms runtime_active_time runtime_suspended_time >>> control runtime_status >>> $ ls /sys/class/i2c-dev/i2c-2/device/2-0041/power/ >>> autosuspend_delay_ms runtime_active_time runtime_suspended_time >>> control runtime_status >>> $ ls /sys/class/i2c-dev/i2c-2/power/ >>> autosuspend_delay_ms runtime_active_time runtime_suspended_time >>> control runtime_status >> >> You need to set CONFIG_PM_ADVANCED_DEBUG to see those (and other debug >> attributes). >> >>>> If they are "async", you can write "disable" to this attribute to turn >>>> them into "sync" devices. I'd do this and see what happens. >> >> You may also turn off async suspend altogether: >> >> # echo 0 > /sys/power/pm_async >> >> and see if this helps. This does indeed help! >>>> Overall, it looks like some dependencies aren't properly represented >>>> by device links on this platform. >>> >>> Yes that would appear to be the case, but at the moment, I don't see >>> what it is. The ina3221 devices appear to suspend fine AFAICT, but hangs >>> when suspending I2C controller. Exactly where is still a mystery. > > I checked in the meantime and found that the i2c subsystem enables > async suspend/resume for all devices, clients and controllers, so the > devices in question are "async" AFAICS. So that would make sense given that the above works. When it fails it appears to hang in dpm_wait_for_subordinate() when calling dpm_wait_for_children() from what I can tell. I will enable the PM_ADVANCED_DEBUG and confirm that making the I2C itself non-async works. Jon -- nvpublic