On Thu, Jan 23, 2020 at 9:31 AM Felipe Balbi <balbi@xxxxxxxxxx> wrote: > "Yang, Fei" <fei.yang@xxxxxxxxx> writes: > >>> Hey all, > >>> I wanted to send these out for comment and thoughts. > >>> > >>> Since ~4.20, when the functionfs gadget enabled scatter-gather > >>> support, we have seen problems with adb connections stalling and > >>> stopping to function on hardware with dwc3 usb controllers. > >>> Specifically, HiKey960, Dragonboard 845c, and Pixel3 devices. > >> > >> Any chance this: > >> > >> https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git/commit/?h=testing/next&id=f63333e8e4fd63d8d8ae83b89d2c38cf21d64801 > > This is a different issue. I have tried initializing num_sgs when debugging this adb stall problem, but it didn't help. > > So multiple folks have run through this problem, but not *one* has > tracepoints collected from the issue? C'mon guys. Can someone, please, > collect tracepoints so we can figure out what's actually going on? Sure, I can do that. Though to be fair, I recall Fei sending out tracepoint data earlier that didn't get a response. So attached is trace/regdump data for db845c both in the failure case and with the patch ("Correct the logic for finding last SG entry"). I'll collect HiKey960 data here after lunch when I can swap over to that board and will send it along soon. Thanks so much for taking a look at this! -john
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