Commit f81f46e1 authored by Gregory Herrero's avatar Gregory Herrero Committed by Felipe Balbi
Browse files

usb: dwc2: implement hibernation during bus suspend/resume 



Allow controller to enter in hibernation during usb bus suspend and
inform both phy and gadget about the suspended state.
While in hibernation, the controller can't detect the resume condition.
An external mechanism must call usb_phy_set_suspend on resume.
Exit hibernation when controller gets the resume interrupt and inform
only gadget driver about it.

Acked-by: default avatarJohn Youn <johnyoun@synopsys.com>
Signed-off-by: default avatarGregory Herrero <gregory.herrero@intel.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent d17ee77b

drivers/usb/dwc2/core.h

+2 −0
Original line number Diff line number Diff line
@@ -1088,6 +1088,7 @@ extern void s3c_hsotg_core_init_disconnected(struct dwc2_hsotg *dwc2, 
extern void s3c_hsotg_core_connect(struct dwc2_hsotg *hsotg);

extern void s3c_hsotg_disconnect(struct dwc2_hsotg *dwc2);

extern int s3c_hsotg_set_test_mode(struct dwc2_hsotg *hsotg, int testmode);

#define dwc2_is_device_connected(hsotg) (hsotg->connected)

#else

static inline int s3c_hsotg_remove(struct dwc2_hsotg *dwc2)

{ return 0; }
@@ -1104,6 +1105,7 @@ static inline void s3c_hsotg_disconnect(struct dwc2_hsotg *dwc2) {} 
static inline int s3c_hsotg_set_test_mode(struct dwc2_hsotg *hsotg,

							int testmode)

{ return 0; }

#define dwc2_is_device_connected(hsotg) (0)

#endif



#if IS_ENABLED(CONFIG_USB_DWC2_HOST) || IS_ENABLED(CONFIG_USB_DWC2_DUAL_ROLE)

drivers/usb/dwc2/core_intr.c

+32 −0
Original line number Diff line number Diff line
@@ -334,6 +334,7 @@ static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg) 
 */

static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)

{

	int ret;

	dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");

	dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
@@ -345,6 +346,11 @@ static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg) 
			/* Clear Remote Wakeup Signaling */

			dctl &= ~DCTL_RMTWKUPSIG;

			writel(dctl, hsotg->regs + DCTL);

			ret = dwc2_exit_hibernation(hsotg, true);

			if (ret)

				dev_err(hsotg->dev, "exit hibernation failed\n");



			call_gadget(hsotg, resume);

		}

		/* Change to L0 state */

		hsotg->lx_state = DWC2_L0;
@@ -397,6 +403,7 @@ static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg) 
static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)

{

	u32 dsts;

	int ret;



	dev_dbg(hsotg->dev, "USB SUSPEND\n");
@@ -411,6 +418,30 @@ static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg) 
			"DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n",

			!!(dsts & DSTS_SUSPSTS),

			hsotg->hw_params.power_optimized);

		if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) {

			/* Ignore suspend request before enumeration */

			if (!dwc2_is_device_connected(hsotg)) {

				dev_dbg(hsotg->dev,

						"ignore suspend request before enumeration\n");

				goto clear_int;

			}



			ret = dwc2_enter_hibernation(hsotg);

			if (ret) {

				dev_err(hsotg->dev,

					"enter hibernation failed\n");

				goto skip_power_saving;

			}



			udelay(100);



			/* Ask phy to be suspended */

			if (!IS_ERR_OR_NULL(hsotg->uphy))

				usb_phy_set_suspend(hsotg->uphy, true);

skip_power_saving:

			/* Call gadget suspend callback */

			call_gadget(hsotg, suspend);

		}

	} else {

		if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {

			dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
@@ -426,6 +457,7 @@ static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg) 
	/* Change to L2 (suspend) state */

	hsotg->lx_state = DWC2_L2;



clear_int:

	/* Clear interrupt */

	writel(GINTSTS_USBSUSP, hsotg->regs + GINTSTS);

}

CRA Git | Maintained and supported by SUSTech CRA and CCSE