On Sat, Oct 01, 2016 at 11:58:10PM +0200, Rafał Miłecki wrote: > From: Rafał Miłecki <rafal@xxxxxxxxxx> > > Broadcom's Northstar XHCI controllers seem to need a special start > procedure to work correctly. There isn't any official documentation on > this, the problem is that controller doesn't detect any connected > devices with default setup. Moreover connecting USB device to controller > that doesn't run properly can cause SoC's watchdog issues. > > A workaround that was successfully tested on multiple devices is to > perform a fake doorbell. This patch adds code for doing that and a DT > binding enabling it. > > Signed-off-by: Rafał Miłecki <rafal@xxxxxxxxxx> > --- > Documentation/devicetree/bindings/usb/usb-xhci.txt | 2 + > drivers/usb/host/xhci-plat.c | 6 +++ > drivers/usb/host/xhci.c | 63 ++++++++++++++++++++-- > drivers/usb/host/xhci.h | 1 + > 4 files changed, 69 insertions(+), 3 deletions(-) > > diff --git a/Documentation/devicetree/bindings/usb/usb-xhci.txt b/Documentation/devicetree/bindings/usb/usb-xhci.txt > index 966885c..ce01b7f 100644 > --- a/Documentation/devicetree/bindings/usb/usb-xhci.txt > +++ b/Documentation/devicetree/bindings/usb/usb-xhci.txt > @@ -26,6 +26,8 @@ Required properties: > Optional properties: > - clocks: reference to a clock > - usb3-lpm-capable: determines if platform is USB3 LPM capable > + - usb3-fake-doorbell: determines if controller requires a fake doorbell when > + starting it You should use Northstar XHCI compatible string to enable this. Then the DT doesn't need updating. Rob -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
