1 files changed, 73 insertions, 30 deletions

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 173f5329d3d9..1b8014ab0b25 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -57,7 +57,7 @@ int dwc3_gadget_set_test_mode(struct dwc3 *dwc, int mode)
 		return -EINVAL;
 	}
 
-	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+	dwc3_gadget_dctl_write_safe(dwc, reg);
 
 	return 0;
 }
@@ -111,6 +111,9 @@ int dwc3_gadget_set_link_state(struct dwc3 *dwc, enum dwc3_link_state state)
 	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 	reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
 
+	/* set no action before sending new link state change */
+	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+
 	/* set requested state */
 	reg |= DWC3_DCTL_ULSTCHNGREQ(state);
 	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
@@ -707,6 +710,12 @@ static void dwc3_remove_requests(struct dwc3 *dwc, struct dwc3_ep *dep)
 
 		dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
 	}
+
+	while (!list_empty(&dep->cancelled_list)) {
+		req = next_request(&dep->cancelled_list);
+
+		dwc3_gadget_giveback(dep, req, -ESHUTDOWN);
+	}
 }
 
 /**
@@ -1441,6 +1450,12 @@ static int __dwc3_gadget_ep_queue(struct dwc3_ep *dep, struct dwc3_request *req)
 	list_add_tail(&req->list, &dep->pending_list);
 	req->status = DWC3_REQUEST_STATUS_QUEUED;
 
+	/* Start the transfer only after the END_TRANSFER is completed */
+	if (dep->flags & DWC3_EP_END_TRANSFER_PENDING) {
+		dep->flags |= DWC3_EP_DELAY_START;
+		return 0;
+	}
+
 	/*
 	 * NOTICE: Isochronous endpoints should NEVER be prestarted. We must
 	 * wait for a XferNotReady event so we will know what's the current
@@ -1822,7 +1837,7 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on, int suspend)
 		dwc->pullups_connected = false;
 	}
 
-	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+	dwc3_gadget_dctl_write_safe(dwc, reg);
 
 	do {
 		reg = dwc3_readl(dwc->regs, DWC3_DSTS);
@@ -2078,6 +2093,26 @@ static void dwc3_gadget_config_params(struct usb_gadget *g,
 {
 	struct dwc3		*dwc = gadget_to_dwc(g);
 
+	params->besl_baseline = USB_DEFAULT_BESL_UNSPECIFIED;
+	params->besl_deep = USB_DEFAULT_BESL_UNSPECIFIED;
+
+	/* Recommended BESL */
+	if (!dwc->dis_enblslpm_quirk) {
+		/*
+		 * If the recommended BESL baseline is 0 or if the BESL deep is
+		 * less than 2, Microsoft's Windows 10 host usb stack will issue
+		 * a usb reset immediately after it receives the extended BOS
+		 * descriptor and the enumeration will fail. To maintain
+		 * compatibility with the Windows' usb stack, let's set the
+		 * recommended BESL baseline to 1 and clamp the BESL deep to be
+		 * within 2 to 15.
+		 */
+		params->besl_baseline = 1;
+		if (dwc->is_utmi_l1_suspend)
+			params->besl_deep =
+				clamp_t(u8, dwc->hird_threshold, 2, 15);
+	}
+
 	/* U1 Device exit Latency */
 	if (dwc->dis_u1_entry_quirk)
 		params->bU1devExitLat = 0;
@@ -2441,6 +2476,13 @@ static int dwc3_gadget_ep_reclaim_trb_linear(struct dwc3_ep *dep,
 
 static bool dwc3_gadget_ep_request_completed(struct dwc3_request *req)
 {
+	/*
+	 * For OUT direction, host may send less than the setup
+	 * length. Return true for all OUT requests.
+	 */
+	if (!req->direction)
+		return true;
+
 	return req->request.actual == req->request.length;
 }
 
@@ -2465,7 +2507,7 @@ static int dwc3_gadget_ep_cleanup_completed_request(struct dwc3_ep *dep,
 
 	req->request.actual = req->request.length - req->remaining;
 
-	if (!dwc3_gadget_ep_request_completed(req) &&
+	if (!dwc3_gadget_ep_request_completed(req) ||
 			req->num_pending_sgs) {
 		__dwc3_gadget_kick_transfer(dep);
 		goto out;
@@ -2592,8 +2634,14 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc,
 		cmd = DEPEVT_PARAMETER_CMD(event->parameters);
 
 		if (cmd == DWC3_DEPCMD_ENDTRANSFER) {
+			dep->flags &= ~DWC3_EP_END_TRANSFER_PENDING;
 			dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
 			dwc3_gadget_ep_cleanup_cancelled_requests(dep);
+			if ((dep->flags & DWC3_EP_DELAY_START) &&
+			    !usb_endpoint_xfer_isoc(dep->endpoint.desc))
+				__dwc3_gadget_kick_transfer(dep);
+
+			dep->flags &= ~DWC3_EP_DELAY_START;
 		}
 		break;
 	case DWC3_DEPEVT_STREAMEVT:
@@ -2645,12 +2693,12 @@ static void dwc3_reset_gadget(struct dwc3 *dwc)
 static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
 	bool interrupt)
 {
-	struct dwc3 *dwc = dep->dwc;
 	struct dwc3_gadget_ep_cmd_params params;
 	u32 cmd;
 	int ret;
 
-	if (!(dep->flags & DWC3_EP_TRANSFER_STARTED))
+	if (!(dep->flags & DWC3_EP_TRANSFER_STARTED) ||
+	    (dep->flags & DWC3_EP_END_TRANSFER_PENDING))
 		return;
 
 	/*
@@ -2660,16 +2708,13 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
 	 * much trouble synchronizing between us and gadget driver.
 	 *
 	 * We have discussed this with the IP Provider and it was
-	 * suggested to giveback all requests here, but give HW some
-	 * extra time to synchronize with the interconnect. We're using
-	 * an arbitrary 100us delay for that.
+	 * suggested to giveback all requests here.
 	 *
 	 * Note also that a similar handling was tested by Synopsys
 	 * (thanks a lot Paul) and nothing bad has come out of it.
-	 * In short, what we're doing is:
-	 *
-	 * - Issue EndTransfer WITH CMDIOC bit set
-	 * - Wait 100us
+	 * In short, what we're doing is issuing EndTransfer with
+	 * CMDIOC bit set and delay kicking transfer until the
+	 * EndTransfer command had completed.
 	 *
 	 * As of IP version 3.10a of the DWC_usb3 IP, the controller
 	 * supports a mode to work around the above limitation. The
@@ -2678,8 +2723,7 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
 	 * by writing GUCTL2[14]. This polling is already done in the
 	 * dwc3_send_gadget_ep_cmd() function so if the mode is
 	 * enabled, the EndTransfer command will have completed upon
-	 * returning from this function and we don't need to delay for
-	 * 100us.
+	 * returning from this function.
 	 *
 	 * This mode is NOT available on the DWC_usb31 IP.
 	 */
@@ -2693,8 +2737,10 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force,
 	WARN_ON_ONCE(ret);
 	dep->resource_index = 0;
 
-	if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A)
-		udelay(100);
+	if (!interrupt)
+		dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
+	else
+		dep->flags |= DWC3_EP_END_TRANSFER_PENDING;
 }
 
 static void dwc3_clear_stall_all_ep(struct dwc3 *dwc)
@@ -2723,12 +2769,12 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
 {
 	int			reg;
 
+	dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RX_DET);
+
 	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 	reg &= ~DWC3_DCTL_INITU1ENA;
-	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
-
 	reg &= ~DWC3_DCTL_INITU2ENA;
-	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+	dwc3_gadget_dctl_write_safe(dwc, reg);
 
 	dwc3_disconnect_gadget(dwc);
 
@@ -2780,7 +2826,7 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
 
 	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 	reg &= ~DWC3_DCTL_TSTCTRL_MASK;
-	dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+	dwc3_gadget_dctl_write_safe(dwc, reg);
 	dwc->test_mode = false;
 	dwc3_clear_stall_all_ep(dwc);
 
@@ -2868,7 +2914,8 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
 		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 		reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
 
-		reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);
+		reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold |
+					    (dwc->is_utmi_l1_suspend << 4));
 
 		/*
 		 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and
@@ -2883,11 +2930,11 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
 		if (dwc->has_lpm_erratum && dwc->revision >= DWC3_REVISION_240A)
 			reg |= DWC3_DCTL_NYET_THRES(dwc->lpm_nyet_threshold);
 
-		dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+		dwc3_gadget_dctl_write_safe(dwc, reg);
 	} else {
 		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 		reg &= ~DWC3_DCTL_HIRD_THRES_MASK;
-		dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+		dwc3_gadget_dctl_write_safe(dwc, reg);
 	}
 
 	dep = dwc->eps[0];
@@ -2996,7 +3043,7 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
 
 				reg &= ~u1u2;
 
-				dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+				dwc3_gadget_dctl_write_safe(dwc, reg);
 				break;
 			default:
 				/* do nothing */
@@ -3243,14 +3290,14 @@ static int dwc3_gadget_get_irq(struct dwc3 *dwc)
 	struct platform_device *dwc3_pdev = to_platform_device(dwc->dev);
 	int irq;
 
-	irq = platform_get_irq_byname(dwc3_pdev, "peripheral");
+	irq = platform_get_irq_byname_optional(dwc3_pdev, "peripheral");
 	if (irq > 0)
 		goto out;
 
 	if (irq == -EPROBE_DEFER)
 		goto out;
 
-	irq = platform_get_irq_byname(dwc3_pdev, "dwc_usb3");
+	irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
 	if (irq > 0)
 		goto out;
 
@@ -3261,9 +3308,6 @@ static int dwc3_gadget_get_irq(struct dwc3 *dwc)
 	if (irq > 0)
 		goto out;
 
-	if (irq != -EPROBE_DEFER)
-		dev_err(dwc->dev, "missing peripheral IRQ\n");
-
 	if (!irq)
 		irq = -EINVAL;
 
@@ -3318,7 +3362,6 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 	dwc->gadget.speed		= USB_SPEED_UNKNOWN;
 	dwc->gadget.sg_supported	= true;
 	dwc->gadget.name		= "dwc3-gadget";
-	dwc->gadget.is_otg		= dwc->dr_mode == USB_DR_MODE_OTG;
 	dwc->gadget.lpm_capable		= true;
 
 	/*