Mathias & Felipe, On 17/11/16 17:01, Roger Quadros wrote: > Hi, > > Some XHCI controllers e.g. dwc3 based have a broken Port disable [1]. > > If the attached high-speed device is misbehaving, the USB stack typically > disables the port using the PED bit in PORTSC. For the controllers that > have broken port disable, the port fails to detect further attach/detach > events and so high-speed devices can no longer be enumerated on the > port. The workaround is to prevent port disable using PED on such > controllers. > > We add a new BROKEN_PED quirk flag and 'quirk-broken-port-ped' device > property and prevent port disable using PED if we encounter the quirk flag. > > [1] - AM572x Silicon Errata http://www.ti.com/lit/er/sprz429j/sprz429j.pdf > Section i896— USB xHCI Port Disable Feature Does Not Work Any comments on this series? patch 1 is at v3. Rest 2 are original. cheers, -roger > > cheers, > -roger > > Felipe Balbi (3): > usb: xhci: add quirk flag for broken PED bits > usb: host: xhci-plat: enable BROKEN_PED quirk if platform requested > usb: dwc3: host: pass quirk-broken-port-ped property for known broken > revisions > > Documentation/devicetree/bindings/usb/usb-xhci.txt | 1 + > drivers/usb/dwc3/host.c | 21 ++++++++++++++++++--- > drivers/usb/host/xhci-hub.c | 6 ++++++ > drivers/usb/host/xhci-plat.c | 3 +++ > drivers/usb/host/xhci.h | 3 +++ > 5 files changed, 31 insertions(+), 3 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
