On 17/01/2024 21:39, Thinh Nguyen wrote: > [...] > That means the disconnection is initiated by the dwc3 driver. This > should happen when you put the STEAM DECK in suspend while connected to > the laptop. From your laptop, you should see the DECK is disconnected as > if the cable is unplugged. > > If that did not happen, can you capture the dwc3 tracepoints to see > what's wrong? > > You can follow this instruction to capture the tracepoints: > https://www.kernel.org/doc/html/latest/driver-api/usb/dwc3.html#required-information > Hi Thinh, thanks again for your patience and suggestions! I've tried my best to determine the state of the USB port from my laptop PoV when connecting the Deck there, but I was unsuccessful. The Deck doesn't appear on laptop's lsusb output, and there's nothing on dmesg / tracing (xhci), dynamic debug or some power interfaces I poked about that. The way to go, IIUC, it's now trying to measure that directly in the port, using a multimeter or some HW device for that. I don't have that, but what I was able to do instead is collecting the traces you asked, at least heh So, I did 4 collections, all in the attached tarball. (1) Right after booting the Steam Deck and enabling the traces [0], I've changed the mode of dwc3 (in the debugfs) from host to device - results on {trace,regdump}.1 (2) Plugged the USB cable connecting the Deck to my laptop - results at {trace,regdump}.2 and as we can see, traces are empty. (3) Attempt suspending the Deck (by running "echo mem > /sys/power/state"), it failed as expected - then I've collected results on {trace,regdump}.3 (4) [bonus] Collected the same results of 3 (after rebooting the Deck) but running dwc3 with this patch/quirk - it's easy to notice in the trace, as we can see the extras readl/writel prior to suspend. In this case, suspend works...and results are on {trace,regdump}.4-PATCHED Tests were done on kernel 6.7 mainline, no OOT drivers running. Hope it helps to narrow down the issue, and again, thanks for your help here. [0] cd /sys/kernel/tracing/ echo 1 > events/dwc3/enable echo :mod:dwc3 > set_ftrace_filter echo :mod:dwc3_pci >> set_ftrace_filter echo function > current_tracer > [...] > That means to unplug the cable connected to the STEAM DECK. Put the > STEAM DECK to suspend. Check to see if it stays suspend or it would wake > up right away. Oh, this case was tested before and it works fine =) > Also, in your test, the connected host (the laptop) remained ON at all > time while the STEAM DECK was tested for suspend right? > Yes, laptop always powered ON! Cheers, Guilherme
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