Just wanted to get some early feedback on this before I submit it for real for the 4.12 timeframe. This is the last patch, that isn't already queued, which I need to get hikey's USB working properly.
Feedback would be greatly appreciated! thanks -john I had seen some odd behavior with HiKey's usb-gadget interface that I finally seemed to have chased down. Basically every other time I pluged in the OTG port, the gadget interface would properly initialize. The other times, I'd get a big WARN_ON in dwc2_hsotg_init_fifo() about the fifo_map not being clear. Ends up if we don't disconnect the gadget state, the fifo-map doesn't get cleared properly, which causes WARN_ON messages and also results in the device not properly being setup as a gadget every other time the OTG port is connected. So this patch adds a call to dwc2_hsotg_disconnect() in the reset path so the state is properly cleared. With it, the gadget interface initializes properly on every plug in. Cc: Wei Xu <xuw...@hisilicon.com> Cc: Guodong Xu <guodong...@linaro.org> Cc: Amit Pundir <amit.pun...@linaro.org> Cc: Rob Herring <robh...@kernel.org> Cc: John Youn <johny...@synopsys.com> Cc: Douglas Anderson <diand...@chromium.org> Cc: Chen Yu <cheny...@huawei.com> Cc: Felipe Balbi <felipe.ba...@linux.intel.com> Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org> Cc: linux-...@vger.kernel.org Signed-off-by: John Stultz <john.stu...@linaro.org> --- drivers/usb/dwc2/hcd.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c index 90bd248..067202d 100644 --- a/drivers/usb/dwc2/hcd.c +++ b/drivers/usb/dwc2/hcd.c @@ -3266,6 +3266,7 @@ static void dwc2_conn_id_status_change(struct work_struct *work) dwc2_core_init(hsotg, false); dwc2_enable_global_interrupts(hsotg); spin_lock_irqsave(&hsotg->lock, flags); + dwc2_hsotg_disconnect(hsotg); dwc2_hsotg_core_init_disconnected(hsotg, false); spin_unlock_irqrestore(&hsotg->lock, flags); dwc2_hsotg_core_connect(hsotg); -- 2.7.4