Hi, Vincent Pelletier <plr.vincent@xxxxxxxxx> writes: > Hello, > > On Sun, Mar 26, 2017 at 9:20 PM, Andy Shevchenko > <andriy.shevchenko@xxxxxxxxxxxxxxx> wrote: >> On Sat, 2017-03-25 at 08:06 +0900, Vincent Pelletier wrote: >>> FWIW, at home enumeration happens much more reliably behind a hub than >>> directly on a host (both being xHCI). Maybe my edison board has some >>> electrical issue a hub would tolerate better ? > > Re-reading what I wrote, I realize my vocabulary is misleading. > Rephrasing for the record: > > Enumeration (HS chirp, bus address attribution) typically works, even > directly on an xHCI. It is SET_CONFIGURATION (including the one done > by the kernel after enumerating and before any driver tries to access > the device) which very often fails on an xHCI, but very often succeeds > when a hub (in my case, USB3) is inserted between the edison and the > same xHCI. I noticed that too and I still have no idea what's going on :-s -- balbi
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