Commit 9156a7ef authored Jan 23, 2017 by Chen Yu Committed by Felipe Balbi Jan 24, 2017

usb: dwc2: Force port resume on switching to device mode



We've seen failures when switching between host and gadget mode,
which was diagnosed as being caused due to the bus being
auto-suspended when we switched.

So this patch forces a port resume when switching to device
mode if the bus is suspended.

Cc: Wei Xu <xuwei5@hisilicon.com>
Cc: Guodong Xu <guodong.xu@linaro.org>
Cc: Amit Pundir <amit.pundir@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: John Youn <johnyoun@synopsys.com>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Chen Yu <chenyu56@huawei.com>
Cc: Vardan Mikayelyan <mvardan@synopsys.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Felipe Balbi <felipe.balbi@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Chen Yu <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

parent fc30c4bb

drivers/usb/dwc2/hcd.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -54,6 +54,8 @@
		#include "core.h"
		#include "hcd.h"

		static void dwc2_port_resume(struct dwc2_hsotg *hsotg);

		/*
		* =========================================================================
		* Host Core Layer Functions
		@@ -3231,6 +3233,11 @@ static void dwc2_conn_id_status_change(struct work_struct *work)
		if (gotgctl & GOTGCTL_CONID_B) {
		/* Wait for switch to device mode */
		dev_dbg(hsotg->dev, "connId B\n");
		if (hsotg->bus_suspended) {
		dev_info(hsotg->dev,
		"Do port resume before switching to device mode\n");
		dwc2_port_resume(hsotg);
		}
		while (!dwc2_is_device_mode(hsotg)) {
		dev_info(hsotg->dev,
		"Waiting for Peripheral Mode, Mode=%s\n",

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