Hi, resume_noirq callbacks are used in PCIe core to restore PCI state (this accesses PCI module). So the clocks of PCI module has to be enabled before resume_noirq. The clocks for the PCI module in DRA7xx is provided by PIPE3 PHY device which in turn gets it's clock from OCP2SCP device. During resume_noirq callbacks, pm_runtime is disabled, so pm_runtime_get_sync is ineffective. However pm_runtime can be enabled using pm_runtime_force_resume. Now the problem is adding pm_runtime_force_resume() in resume_noirq callback of pci-dra7xx driver will enable only the pm_runtime of PCI device but not PIPE3 PHY or OCP2SCP. Adding pm_runtime_force_resume() in resume_noirq callback of PIPE3 PHY driver or OCP2SCP driver will not help if the resume_noirq callbacks in PIP3PHY driver and OCP2SCP driver are invoked after the resume_noirq of pci-dra7xx driver. How to enable the pm_runtime of parent devices in resume_noirq callback? Does existing pm_runtime framework has support for that? Thanks Kishon
