--- Log for 18.09.121  Server: silver.libera.chat  Channel: #rockbox
--- Nick: rb-logbot  Version: Dancer V4.16  Started: 15 days and 13 hours ago

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13.45.57 #       <amachronic> quick question, is there anyone still active familiar with RB's usb stack?
13.48.05 #       <speachy> I've gone spelunking into it far, far more than I'd like (when sorting out the jz47xx USB issues)
13.48.50 #       <speachy> but I don't think any of the folks directly responsible for it are still active.
13.49.20 #       <amachronic> okay. I guessed so.
13.50.17 #       <amachronic> I've realized a lot of control transfer related stuff is broken, both in drivers and in the common usb code.
13.51.20 #       <speachy> That doesn't surprise me, given the persistent reports of intermittent flakiness on a wide variety of targets.
13.51.35 #       <amachronic> for example, the core code doesn't return STALL properly for all types of control transfers. and control writes pretty much don't work.
13.52.09 #       <amachronic> one of the USB drivers doesn't even know the difference between stalling the in vs. out endpoint.
13.52.33 Ctcp    Ignored 2 channel CTCP requests in 11 hours and 19 minutes at the last flood
13.52.33 #       * speachy winces.
13.52.40 #       <speachy> I ran into that in the jz47xx code too
13.53.22 #       <speachy> where it gets messy is that there's a ton of variation in the relative capabilities of our USB drivers, some handle more stuff automatically.
13.53.48 #       <speachy> s/driver/hardware/
13.54.18 #       <speachy> and we sort of tried to make later drivers map the APIs of the original ones.
13.55.10 #       <amachronic> the current API takes a micromangement approach. I think this needs to be changed.
13.55.37 #       <amachronic> like, instead of send/recv ZLP packets and other low-level voodoo we should handle some stuff at a higher level.
13.56.19 #       <amachronic> I'm just not sure how to do this without breaking every other USB driver.
13.57.09 #       <speachy> ... gotta start somewhere
13.57.36 #       <speachy> there was a big SD API rewrite along those same lines a while back.
13.58.15 #       <speachy> our dev builds have been remarkably stable for the past couple of years.  :D
13.59.53 #       <speachy> ... well, propose a new API, I'll be glad to help review it.  I assume you'll want to port the dwc2 driver to the new API; I'll do the same with the jz47xx
14.00.27 #       <speachy> and we can work back from there
14.01.00 #       <amachronic> that'd be great, thanks.
14.01.01 #       <speachy> the as3525 and pp50xx are probably the most important ones to have covered
14.01.34 #       <speachy> I wonder if this b0rkage has anything to do with that optmization-related regression on the as3525v1 targets..
14.02.23 #       <speachy> I have a proper hardware USB sniffer BTW.
14.03.17 #       <amachronic> cool. I'm stuck guessing with wireshark.
14.07.31 #       <speachy> (turns out the dwc2 in host mode doesn't quite handle flow control properly, causing a DoS on some devices)
14.15.13 #       <speachy> oh, one thing I should point out first -- when I hacked in that "prompt the user what to do" when USB was inserted
14.16.03 #       <speachy> on some controllers we only know USB is connected because a posted URB gets returned.
14.16.14 #       <speachy> others we're told and can initiate it at our leisure
14.16.28 #       <speachy> that sort of crap really complicates clean APIs.
14.17.26 #       <amachronic> dconrad was fighting with that a while back, for some reason.
14.19.59 #       <amachronic> control requests seem to be the main buggy thing so that's where I'm focusing for now.
14.22.25 #       <speachy> gotta run and deal with more meatspace stuff.   but I'm looking forward to seeing what you come up with
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