Hi Mathias, On Mo, 2016-08-29 at 13:59 +0300, Mathias Nyman wrote: > On 29.08.2016 10:28, Felipe Balbi wrote: > > > > > > Hi, > > > > Michael Niewöhner <linux@xxxxxxxxxxxxxx> writes: > > > > > > [1.] One line summary of the problem: > > > DWC3 USB 3.0 not working on Odroid-XU4 with Exynos 5422 > > > > > > [2.] Full description of the problem/report: > > > No usb 3.0 devices are being detected when attached while USB 2.0 > > > devices work on the same port. > > > USB 3.0 works after applying patches [9.1] and [9.2], but seems > > > to be > > > buggy. The usb hub is redetected every time an usb device is > > > attached. > > > > dwc3 is host, which means it's actually XHCI :-) > > > > Adding Mathias > > > > > > > > dmesg: > > > [ 192.287080] usb 3-1.2: USB disconnect, device number 7 > > > [ 210.370699] hub 3-1:1.0: hub_ext_port_status failed (err = > > > -71) > > Looks like the hub GetPortStatus request fails with protocol error. > > Reading xhci root hub port status is mostly just register reads and > writes. It > shouldn't include any actual transfers that could return -EPROTO > > So this is not the root hub? but a external or integrated on your > board, right? > > The protocol error -71 is returned at transfer errors or if device > stalled. > > Adding more xhci debugging options could show something: > echo -n 'module xhci_hcd =p' > > /sys/kernel/debug/dynamic_debug/control > > > > > > > > > [9.] Other notes, patches, fixes, workarounds: > > > [9.1] https://lkml.org/lkml/2014/4/28/234 > > > [9.2] https://lkml.org/lkml/2015/2/2/259 > > The additional patches that makes things somehow work involve tuning > the PHY, > this is an area I'm not familiar with > > -Mathias > I'm sorry, I should have said that this is the dmesg output with the patches applied. Without them there is no output at all when I attach an usb 3.0 device. Michael
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