On Wed, 2 Oct 2013, yoma sophian wrote: > 1. in susped, we will gate our ehci clk > in resumt, we need to release clk gating to let ehci control work. > and above are platform specific behavior need to do > there seems no such place to do above 2 things. You don't do these things in the USB suspend routine; you do them in the controller suspend routine. For example, take a look at s5p_ehci_suspend() and s5p_ehci_resume() in ehci-s5p.c. > 2. in ehci_bus_resume, which handle ehci go back from both suspend/hibernate. > This function handle ehci basic register default setting, such as > re-init operational registers and restore CMD_RUN, framelist size, and > irq threshold Yes. > 3. In xhci_bus_resume, I cannot see any behaviour for re-init > operational registers and restore CMD_RUN, framelist size, and irq > threshold. for xhci. > when hibernate happen, the data allocated for device context still > exist in ddr, but xhci should reinitialise the base address to its > register. > If my consumption is correct, why I cannot find this part in xhci_bus_resume. > so far xhci_bus_resume only take port status. Look at xhci_resume() in xhci.c instead. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
