On Fri, 5 Dec 2014, Chuansheng Liu wrote: > Some history from > commit e6b7e41cdd8c ("ata: Disabling the async PM for JMicron chip 363/361") > == > Since v3.15, the PM feature of async noirq > commit 76569faa62c4 ("PM / sleep: Asynchronous threads for resume_noirq") is introduced. > > Then Jay hit one system resuming issue that one of the JMicron controller > can not be powered up successfully. > > His device tree is like below: > +-1c.4-[02]--+-00.0 JMicron Technology Corp. JMB363 SATA/IDE Controller > | \-00.1 JMicron Technology Corp. JMB363 SATA/IDE Controller > > After investigation, we found the the Micron chip 363 included > one SATA controller(0000:02:00.0) and one PATA controller(0000:02:00.1), > these two controllers do not have parent-children relationship, > but the PATA controller only can be powered on after the SATA controller > has finished the powering on. > > If we enabled the async noirq(), then the below error is hit during noirq > phase: > pata_jmicron 0000:02:00.1: Refused to change power state, currently in D3 > Here for JMicron chip 363/361, we need forcedly to disable the async method. You know, this is exactly why device_pm_wait_for_dev() exists -- so that asynchronous power-management operations can wait for other devices even when there's no parent-child relation. You should try to use device_pm_wait_for_dev() instead of disabling async suspend/resume. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html