On Mon, Mar 29, 2021 at 04:38:10PM +0800, liulongfang wrote: > On 2021/3/26 23:28, Alan Stern wrote: > > On Fri, Mar 26, 2021 at 04:54:56PM +0800, Longfang Liu wrote: > >> When OHCI enters the S4 sleep state, the USB sleep process will call > >> check_root_hub_suspend() and ohci_bus_suspend() instead of > >> ohci_suspend() and ohci_bus_suspend(), this causes the OHCI interrupt > >> to not be closed. > > > > What on earth are you talking about? This isn't true at all. > > > > Can you provide more information about your system? Are you using a > > PCI-based OHCI controller or a platform device (and if so, which one)? > > Can you post system logs to back up your statements? > > The system is UOS, the kernel version is kernel4.19, and the driver > used is ohci-pci.c based on PCI. > > By adding the log in ohci_suspend, and then viewing the dmesg after sleep, > I can confirm that the system does not call ohci_suspend in S4 sleep mode. Then your job is to figure out why not. Doesn't entry into S4 sleep call hcd_pci_suspend() in core/hcd-pci.c, and doesn't that call suspend_common(), and doesn't that call hcd->driver->pci_suspend(), and isn't that routine ohci_suspend()? Alan Stern
