On Fri, May 02, 2025 at 11:20:51AM +0800, hans.zhang@xxxxxxxxxxx wrote: > From: Hans Zhang <hans.zhang@xxxxxxxxxxx> > > When PCIe ASPM L1 is enabled (CONFIG_PCIEASPM_POWERSAVE=y), certain CONFIG_PCIEASPM_POWERSAVE=y only sets the default. L1 can be enabled dynamically regardless of the config. > NVMe controllers fail to release LPI MSI-X interrupts during system > suspend, leading to a system hang. This occurs because the driver's > existing power management path does not fully disable the device > when ASPM is active. I have no idea what this has to do with ASPM L1. I do see that nvme_suspend() tests pcie_aspm_enabled(pdev) (which seems kind of janky and racy). But this doesn't explain anything about what would cause a system hang. > The fix adds an explicit device disable and reset preparation step > in the suspend path after successfully setting the power state. > This ensures proper cleanup of interrupt resources even when ASPM > L1 is enabled, preventing the system from hanging during suspend. Maybe there's a clue in the 600 lines of debug output that I trimmed, but without some interpretation, I have no idea how to find it. Unless you see similar problems on other systems, I would suspect an issue with the SoC or the SoC driver where you do see problems. Bjorn
