On Wed, Apr 7, 2021 at 3:24 AM Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx> wrote: > Thinh Nguyen wrote: ... > > I took a look at the "bad" and "normal" tracepoints. There are a few > > 1-second delays where the host tried to bring the device back and > > resume from low power: > > > > ksoftirqd/0-10 [000] d.s. 231.501808: dwc3_gadget_ep_cmd: ep3in: cmd 'Update Transfer' [60007] params 00000000 00000000 00000000 --> status: Successful > > ksoftirqd/0-10 [000] d.s. 231.501809: dwc3_readl: addr 00000000d68ecd36 value 0000a610 > > ksoftirqd/0-10 [000] d.s. 231.501810: dwc3_writel: addr 00000000d68ecd36 value 0000a710 > > <idle>-0 [000] d.h. 232.499418: dwc3_readl: addr 00000000a15e0e35 value 00000034 > > <idle>-0 [000] d.h. 232.499423: dwc3_readl: addr 00000000bb67b585 value 00001000 > > <idle>-0 [000] d.h. 232.499425: dwc3_writel: addr 00000000bb67b585 value 80001000 > > <idle>-0 [000] d.h. 232.499427: dwc3_writel: addr 00000000a15e0e35 value 00000034 > > irq/15-dwc3-476 [000] d... 232.499480: dwc3_event: event (00000401): WakeUp [U0] > > irq/15-dwc3-476 [000] d... 232.499492: dwc3_event: event (00000401): WakeUp [U0] > > irq/15-dwc3-476 [000] d... 232.499496: dwc3_event: event (00006088): ep2out: Transfer In Progress [0] (SIm) > > irq/15-dwc3-476 [000] d... 232.499501: dwc3_complete_trb: ep2out: trb 00000000c7ce524e (E179:D170) buf 0000000008273540 size 1463 ctrl 00000818 (hlcS:sC:normal) > > irq/15-dwc3-476 [000] d... 232.499518: dwc3_gadget_giveback: ep2out: req 0000000012e296cf length 73/1536 zsI ==> 0 > > irq/15-dwc3-476 [000] d... 232.499562: dwc3_ep_queue: ep2out: req 0000000012e296cf length 0/1536 zsI ==> -115 > > irq/15-dwc3-476 [000] d... 232.499601: dwc3_prepare_trb: ep2out: trb 000000008c083777 (E180:D170) buf 0000000002a7e9c0 size 1536 ctrl 00000819 (HlcS:sC:normal) > > > > > > Your device is operating in highspeed right? Try to turn off LPM from > > host and see if that helps with the speed throttling issue. (If you're > > using xHCI host, then set XHCI_HW_LPM_DISABLE). It may also help with > > the connection issue you saw. > > > > It seems to be an issue from host, but I can't tell for sure unless we > > have some USB traffic analyzer that shows what's going on. Have you > > tried different hosts? > > > > You can also disable LPM from the gadget side by setting > dwc->dis_enblslpm_quirk. Ferry, it can be done by adding a corresponding property to the dwc3-pci.c for Intel Merrifield platform. I'll check also for my case and perhaps I can collect some traces in my case later on when I have more time for that. -- With Best Regards, Andy Shevchenko
