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Commit 21795c82 authored by Mian Yousaf Kaukab's avatar Mian Yousaf Kaukab Committed by Felipe Balbi
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usb: dwc2: exit hibernation on session request 



Controller enters hibernation through suspend interrupt on
disconnection. On connection, session request interrupt is generated.
dwc2 must exit hibernation and restore state from this interrupt
before continuing.

In host mode, exit from hibernation is handled by bus_resume function.

Signed-off-by: default avatarMian Yousaf Kaukab <yousaf.kaukab@intel.com>
Signed-off-by: default avatarGregory Herrero <gregory.herrero@intel.com>
Tested-by: default avatarRobert Baldyga <r.baldyga@samsung.com>
Tested-by: default avatarDinh Nguyen <dinguyen@opensource.altera.com>
Tested-by: default avatarJohn Youn <johnyoun@synopsys.com>
Acked-by: default avatarJohn Youn <johnyoun@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 8fc37b82

drivers/usb/dwc2/core_intr.c

+17 −5
Original line number Diff line number Diff line
@@ -313,17 +313,29 @@ static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg) 
 */

static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)

{

	dev_dbg(hsotg->dev, "++Session Request Interrupt++\n");

	int ret;



	dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",

							hsotg->lx_state);



	/* Clear interrupt */

	dwc2_writel(GINTSTS_SESSREQINT, hsotg->regs + GINTSTS);



	if (dwc2_is_device_mode(hsotg)) {

		if (hsotg->lx_state == DWC2_L2) {

			ret = dwc2_exit_hibernation(hsotg, true);

			if (ret && (ret != -ENOTSUPP))

				dev_err(hsotg->dev,

					"exit hibernation failed\n");

		}



		/*

	 * Report disconnect if there is any previous session established

		 * Report disconnect if there is any previous session

		 * established

		 */

	if (dwc2_is_device_mode(hsotg))

		dwc2_hsotg_disconnect(hsotg);

	}

}



/*

 * This interrupt indicates that the DWC_otg controller has detected a