> >>> - System suspend/resume > >>> 1. Enable USB wakeup > >>> for i in $(find /sys -name wakeup | grep usb);do echo enabled > > >>> $i;echo "echo enabled > $i";done; 2. Let the system enter suspend > >>> using below command echo mem > /sys/power/state 3. And see if there > >>> is a wakeup block system entering suspend, and check if USB HSIC > >>> works ok after system resume > >> > >> System suspend/resume seems to work fine. After resume the ethernet > >> controller works. > >> > >> root@imxceet-solo-s-43:~# echo mem > /sys/power/state > >> PM: suspend entry (deep) > >> PM: Syncing filesystems ... done. > >> Freezing user space processes ... (elapsed 0.001 seconds) done. > >> OOM killer disabled. > >> Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done. > >> smsc95xx 3-1:1.0 eth1: entering SUSPEND2 mode > >> PM: suspend devices took 0.050 seconds Disabling non-boot CPUs ... > >> usb 3-1: reset high-speed USB device number 2 using ci_hdrc > >> PM: resume devices took 0.590 seconds OOM killer enabled. > >> Restarting tasks ... done. > >> PM: suspend exit > >> smsc95xx 3-1:1.0 eth1: link up, 100Mbps, full-duplex, lpa 0x4DE1 fec > >> 2188000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx > >> > >>> > >>> - Runtime suspend > >>> 1. Enable auto suspend for all USB devices, and check if USBOH3 > >>> clock is closed, make sure do not plug any ethernet cable on the > >>> RJ45 port. > >>> > >>> /* Enable auto suspend */ > >>> for i in $(find /sys -name control | grep usb);do echo auto > > >>> $i;echo "echo auto > $i";done; > >> > >> This doesn't work. When the port is suspended it gets into a loop of > >> suspending/resuming endlessly. If i put two logs in > >> ci_hdrc_imx_runtime_suspend() and ci_hdrc_imx_runtime_resume(), I get > >> this: > >> > >> [...] > >> ci_hdrc_imx_runtime_resume:603 > >> ci_hdrc_imx_runtime_suspend:574 > >> ci_hdrc_imx_runtime_resume:603 > >> ci_hdrc_imx_runtime_suspend:574 > >> ci_hdrc_imx_runtime_resume:603 > >> ci_hdrc_imx_runtime_suspend:574 > >> ci_hdrc_imx_runtime_resume:603 > >> ci_hdrc_imx_runtime_suspend:574 > >> [...] > > > > Ok, forget about the loop, this was caused by one of the other ports, > > that had issues with overcurrent detection. > > > > But still it doesn't work for the HSIC port. > > > > The HSIC device is stuck in status "suspending" (note: "suspending" > > and not "suspended"): > > > > ~# cat /sys/bus/usb/devices/usb1/power/runtime_status > > suspended > > ~# cat /sys/bus/usb/devices/usb2/power/runtime_status > > suspended > > ~# cat /sys/bus/usb/devices/usb3/power/runtime_status > > active > > ~# cat /sys/bus/usb/devices/usb3/3-1/power/runtime_status > > suspending > > It seems like this is a problem with the smsc95xx driver. I fixed this and now the > device is suspending properly, when the network interface is down and resumes > when it comes up. > > I also checked the USBOH3 clock and its properly switched on and off. > > What didn't work is auto suspend and resume on ethernet link down/up, but this > seems to be a restriction of the smsc95xx/usbnet driver. > > So all in all this looks good to me. Please let me know if you need any more > information or tests. > Thanks, Frieder, no more tests are needed. You could send me your dts changes as patches, I will append it at my v2 patch series. Peter
