6 files changed, 306 insertions, 221 deletions

diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
index 11a5b3437c32..aeca902ab6cc 100644
--- a/drivers/usb/cdns3/cdns3-gadget.c
+++ b/drivers/usb/cdns3/cdns3-gadget.c
@@ -1119,6 +1119,8 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 	dma_addr_t trb_dma;
 	u32 togle_pcs = 1;
 	int sg_iter = 0;
+	int num_trb_req;
+	int trb_burst;
 	int num_trb;
 	int address;
 	u32 control;
@@ -1126,16 +1128,15 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 	u16 total_tdl = 0;
 	struct scatterlist *s = NULL;
 	bool sg_supported = !!(request->num_mapped_sgs);
+	u32 ioc = request->no_interrupt ? 0 : TRB_IOC;
 
+	num_trb_req = sg_supported ? request->num_mapped_sgs : 1;
+
+	/* ISO transfer require each SOF have a TD, each TD include some TRBs */
 	if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
-		num_trb = priv_ep->interval;
+		num_trb = priv_ep->interval * num_trb_req;
 	else
-		num_trb = sg_supported ? request->num_mapped_sgs : 1;
-
-	if (num_trb > priv_ep->free_trbs) {
-		priv_ep->flags |= EP_RING_FULL;
-		return -ENOBUFS;
-	}
+		num_trb = num_trb_req;
 
 	priv_req = to_cdns3_request(request);
 	address = priv_ep->endpoint.desc->bEndpointAddress;
@@ -1184,14 +1185,31 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 
 		link_trb->control = cpu_to_le32(((priv_ep->pcs) ? TRB_CYCLE : 0) |
 				    TRB_TYPE(TRB_LINK) | TRB_TOGGLE | ch_bit);
+
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
+			/*
+			 * ISO require LINK TRB must be first one of TD.
+			 * Fill LINK TRBs for left trb space to simply software process logic.
+			 */
+			while (priv_ep->enqueue) {
+				*trb = *link_trb;
+				trace_cdns3_prepare_trb(priv_ep, trb);
+
+				cdns3_ep_inc_enq(priv_ep);
+				trb = priv_ep->trb_pool + priv_ep->enqueue;
+				priv_req->trb = trb;
+			}
+		}
+	}
+
+	if (num_trb > priv_ep->free_trbs) {
+		priv_ep->flags |= EP_RING_FULL;
+		return -ENOBUFS;
 	}
 
 	if (priv_dev->dev_ver <= DEV_VER_V2)
 		togle_pcs = cdns3_wa1_update_guard(priv_ep, trb);
 
-	if (sg_supported)
-		s = request->sg;
-
 	/* set incorrect Cycle Bit for first trb*/
 	control = priv_ep->pcs ? 0 : TRB_CYCLE;
 	trb->length = 0;
@@ -1209,6 +1227,9 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 	do {
 		u32 length;
 
+		if (!(sg_iter % num_trb_req) && sg_supported)
+			s = request->sg;
+
 		/* fill TRB */
 		control |= TRB_TYPE(TRB_NORMAL);
 		if (sg_supported) {
@@ -1223,7 +1244,36 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 			total_tdl += DIV_ROUND_UP(length,
 					       priv_ep->endpoint.maxpacket);
 
-		trb->length |= cpu_to_le32(TRB_BURST_LEN(priv_ep->trb_burst_size) |
+		trb_burst = priv_ep->trb_burst_size;
+
+		/*
+		 * Supposed DMA cross 4k bounder problem should be fixed at DEV_VER_V2, but still
+		 * met problem when do ISO transfer if sg enabled.
+		 *
+		 * Data pattern likes below when sg enabled, package size is 1k and mult is 2
+		 *       [UVC Header(8B) ] [data(3k - 8)] ...
+		 *
+		 * The received data at offset 0xd000 will get 0xc000 data, len 0x70. Error happen
+		 * as below pattern:
+		 *	0xd000: wrong
+		 *	0xe000: wrong
+		 *	0xf000: correct
+		 *	0x10000: wrong
+		 *	0x11000: wrong
+		 *	0x12000: correct
+		 *	...
+		 *
+		 * But it is still unclear about why error have not happen below 0xd000, it should
+		 * cross 4k bounder. But anyway, the below code can fix this problem.
+		 *
+		 * To avoid DMA cross 4k bounder at ISO transfer, reduce burst len according to 16.
+		 */
+		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && priv_dev->dev_ver <= DEV_VER_V2)
+			if (ALIGN_DOWN(trb->buffer, SZ_4K) !=
+			    ALIGN_DOWN(trb->buffer + length, SZ_4K))
+				trb_burst = 16;
+
+		trb->length |= cpu_to_le32(TRB_BURST_LEN(trb_burst) |
 					TRB_LEN(length));
 		pcs = priv_ep->pcs ? TRB_CYCLE : 0;
 
@@ -1235,11 +1285,11 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 			control |= pcs;
 
 		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC  && !priv_ep->dir) {
-			control |= TRB_IOC | TRB_ISP;
+			control |= ioc | TRB_ISP;
 		} else {
 			/* for last element in TD or in SG list */
 			if (sg_iter == (num_trb - 1) && sg_iter != 0)
-				control |= pcs | TRB_IOC | TRB_ISP;
+				control |= pcs | ioc | TRB_ISP;
 		}
 
 		if (sg_iter)
@@ -1250,7 +1300,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 		if (sg_supported) {
 			trb->control |= cpu_to_le32(TRB_ISP);
 			/* Don't set chain bit for last TRB */
-			if (sg_iter < num_trb - 1)
+			if ((sg_iter % num_trb_req) < num_trb_req - 1)
 				trb->control |= cpu_to_le32(TRB_CHAIN);
 
 			s = sg_next(s);
@@ -1270,7 +1320,7 @@ static int cdns3_ep_run_transfer(struct cdns3_endpoint *priv_ep,
 	priv_req->num_of_trb = num_trb;
 
 	if (sg_iter == 1)
-		trb->control |= cpu_to_le32(TRB_IOC | TRB_ISP);
+		trb->control |= cpu_to_le32(ioc | TRB_ISP);
 
 	if (priv_dev->dev_ver < DEV_VER_V2 &&
 	    (priv_ep->flags & EP_TDLCHK_EN)) {
@@ -1508,6 +1558,12 @@ static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
 
 		/* The TRB was changed as link TRB, and the request was handled at ep_dequeue */
 		while (TRB_FIELD_TO_TYPE(le32_to_cpu(trb->control)) == TRB_LINK) {
+
+			/* ISO ep_traddr may stop at LINK TRB */
+			if (priv_ep->dequeue == cdns3_get_dma_pos(priv_dev, priv_ep) &&
+			    priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+				break;
+
 			trace_cdns3_complete_trb(priv_ep, trb);
 			cdns3_ep_inc_deq(priv_ep);
 			trb = priv_ep->trb_pool + priv_ep->dequeue;
@@ -1540,6 +1596,10 @@ static void cdns3_transfer_completed(struct cdns3_device *priv_dev,
 			}
 
 			if (request_handled) {
+				/* TRBs are duplicated by priv_ep->interval time for ISO IN */
+				if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && priv_ep->dir)
+					request->actual /= priv_ep->interval;
+
 				cdns3_gadget_giveback(priv_ep, priv_req, 0);
 				request_handled = false;
 				transfer_end = false;
@@ -2035,11 +2095,10 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
 	bool is_iso_ep = (priv_ep->type == USB_ENDPOINT_XFER_ISOC);
 	struct cdns3_device *priv_dev = priv_ep->cdns3_dev;
 	u32 bEndpointAddress = priv_ep->num | priv_ep->dir;
-	u32 max_packet_size = 0;
-	u8 maxburst = 0;
+	u32 max_packet_size = priv_ep->wMaxPacketSize;
+	u8 maxburst = priv_ep->bMaxBurst;
 	u32 ep_cfg = 0;
 	u8 buffering;
-	u8 mult = 0;
 	int ret;
 
 	buffering = priv_dev->ep_buf_size - 1;
@@ -2061,8 +2120,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
 		break;
 	default:
 		ep_cfg = EP_CFG_EPTYPE(USB_ENDPOINT_XFER_ISOC);
-		mult = priv_dev->ep_iso_burst - 1;
-		buffering = mult + 1;
+		buffering = (priv_ep->bMaxBurst + 1) * (priv_ep->mult + 1) - 1;
 	}
 
 	switch (priv_dev->gadget.speed) {
@@ -2073,17 +2131,8 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
 		max_packet_size = is_iso_ep ? 1024 : 512;
 		break;
 	case USB_SPEED_SUPER:
-		/* It's limitation that driver assumes in driver. */
-		mult = 0;
-		max_packet_size = 1024;
-		if (priv_ep->type == USB_ENDPOINT_XFER_ISOC) {
-			maxburst = priv_dev->ep_iso_burst - 1;
-			buffering = (mult + 1) *
-				    (maxburst + 1);
-
-			if (priv_ep->interval > 1)
-				buffering++;
-		} else {
+		if (priv_ep->type != USB_ENDPOINT_XFER_ISOC) {
+			max_packet_size = 1024;
 			maxburst = priv_dev->ep_buf_size - 1;
 		}
 		break;
@@ -2112,7 +2161,6 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
 	if (priv_dev->dev_ver < DEV_VER_V2)
 		priv_ep->trb_burst_size = 16;
 
-	mult = min_t(u8, mult, EP_CFG_MULT_MAX);
 	buffering = min_t(u8, buffering, EP_CFG_BUFFERING_MAX);
 	maxburst = min_t(u8, maxburst, EP_CFG_MAXBURST_MAX);
 
@@ -2146,7 +2194,7 @@ int cdns3_ep_config(struct cdns3_endpoint *priv_ep, bool enable)
 	}
 
 	ep_cfg |= EP_CFG_MAXPKTSIZE(max_packet_size) |
-		  EP_CFG_MULT(mult) |
+		  EP_CFG_MULT(priv_ep->mult) |			/* must match EP setting */
 		  EP_CFG_BUFFERING(buffering) |
 		  EP_CFG_MAXBURST(maxburst);
 
@@ -2236,6 +2284,13 @@ usb_ep *cdns3_gadget_match_ep(struct usb_gadget *gadget,
 	priv_ep->type = usb_endpoint_type(desc);
 	priv_ep->flags |= EP_CLAIMED;
 	priv_ep->interval = desc->bInterval ? BIT(desc->bInterval - 1) : 0;
+	priv_ep->wMaxPacketSize =  usb_endpoint_maxp(desc);
+	priv_ep->mult = USB_EP_MAXP_MULT(priv_ep->wMaxPacketSize);
+	priv_ep->wMaxPacketSize &= USB_ENDPOINT_MAXP_MASK;
+	if (priv_ep->type == USB_ENDPOINT_XFER_ISOC && comp_desc) {
+		priv_ep->mult =  USB_SS_MULT(comp_desc->bmAttributes) - 1;
+		priv_ep->bMaxBurst = comp_desc->bMaxBurst;
+	}
 
 	spin_unlock_irqrestore(&priv_dev->lock, flags);
 	return &priv_ep->endpoint;
@@ -3019,22 +3074,40 @@ static int cdns3_gadget_check_config(struct usb_gadget *gadget)
 	struct cdns3_endpoint *priv_ep;
 	struct usb_ep *ep;
 	int n_in = 0;
+	int iso = 0;
+	int out = 1;
 	int total;
+	int n;
 
 	list_for_each_entry(ep, &gadget->ep_list, ep_list) {
 		priv_ep = ep_to_cdns3_ep(ep);
-		if ((priv_ep->flags & EP_CLAIMED) && (ep->address & USB_DIR_IN))
-			n_in++;
+		if (!(priv_ep->flags & EP_CLAIMED))
+			continue;
+
+		n = (priv_ep->mult + 1) * (priv_ep->bMaxBurst + 1);
+		if (ep->address & USB_DIR_IN) {
+			/*
+			 * ISO transfer: DMA start move data when get ISO, only transfer
+			 * data as min(TD size, iso). No benefit for allocate bigger
+			 * internal memory than 'iso'.
+			 */
+			if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+				iso += n;
+			else
+				n_in++;
+		} else {
+			if (priv_ep->type == USB_ENDPOINT_XFER_ISOC)
+				out = max_t(int, out, n);
+		}
 	}
 
 	/* 2KB are reserved for EP0, 1KB for out*/
-	total = 2 + n_in + 1;
+	total = 2 + n_in + out + iso;
 
 	if (total > priv_dev->onchip_buffers)
 		return -ENOMEM;
 
-	priv_dev->ep_buf_size = priv_dev->ep_iso_burst =
-			(priv_dev->onchip_buffers - 2) / (n_in + 1);
+	priv_dev->ep_buf_size = (priv_dev->onchip_buffers - 2 - iso) / (n_in + out);
 
 	return 0;
 }
diff --git a/drivers/usb/cdns3/cdns3-gadget.h b/drivers/usb/cdns3/cdns3-gadget.h
index fbe4a8e3aa89..086a7bb83897 100644
--- a/drivers/usb/cdns3/cdns3-gadget.h
+++ b/drivers/usb/cdns3/cdns3-gadget.h
@@ -1168,6 +1168,9 @@ struct cdns3_endpoint {
 	u8			dir;
 	u8			num;
 	u8			type;
+	u8			mult;
+	u8			bMaxBurst;
+	u16			wMaxPacketSize;
 	int			interval;
 
 	int			free_trbs;
diff --git a/drivers/usb/cdns3/cdns3-plat.c b/drivers/usb/cdns3/cdns3-plat.c
index 2c1aca84f226..3ef8e3c872a3 100644
--- a/drivers/usb/cdns3/cdns3-plat.c
+++ b/drivers/usb/cdns3/cdns3-plat.c
@@ -87,16 +87,20 @@ static int cdns3_plat_probe(struct platform_device *pdev)
 	cdns->dev_irq = platform_get_irq_byname(pdev, "peripheral");
 
 	if (cdns->dev_irq < 0)
-		return cdns->dev_irq;
+		return dev_err_probe(dev, cdns->dev_irq,
+				     "Failed to get peripheral IRQ\n");
 
 	regs = devm_platform_ioremap_resource_byname(pdev, "dev");
 	if (IS_ERR(regs))
-		return PTR_ERR(regs);
+		return dev_err_probe(dev, PTR_ERR(regs),
+				     "Failed to get dev base\n");
+
 	cdns->dev_regs	= regs;
 
 	cdns->otg_irq = platform_get_irq_byname(pdev, "otg");
 	if (cdns->otg_irq < 0)
-		return cdns->otg_irq;
+		return dev_err_probe(dev, cdns->otg_irq,
+				     "Failed to get otg IRQ\n");
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "otg");
 	if (!res) {
@@ -119,7 +123,8 @@ static int cdns3_plat_probe(struct platform_device *pdev)
 
 	cdns->usb2_phy = devm_phy_optional_get(dev, "cdns3,usb2-phy");
 	if (IS_ERR(cdns->usb2_phy))
-		return PTR_ERR(cdns->usb2_phy);
+		return dev_err_probe(dev, PTR_ERR(cdns->usb2_phy),
+				     "Failed to get cdn3,usb2-phy\n");
 
 	ret = phy_init(cdns->usb2_phy);
 	if (ret)
@@ -127,7 +132,8 @@ static int cdns3_plat_probe(struct platform_device *pdev)
 
 	cdns->usb3_phy = devm_phy_optional_get(dev, "cdns3,usb3-phy");
 	if (IS_ERR(cdns->usb3_phy))
-		return PTR_ERR(cdns->usb3_phy);
+		return dev_err_probe(dev, PTR_ERR(cdns->usb3_phy),
+				     "Failed to get cdn3,usb3-phy\n");
 
 	ret = phy_init(cdns->usb3_phy);
 	if (ret)
diff --git a/drivers/usb/cdns3/cdns3-starfive.c b/drivers/usb/cdns3/cdns3-starfive.c
index a7265b86e427..c04d196abd87 100644
--- a/drivers/usb/cdns3/cdns3-starfive.c
+++ b/drivers/usb/cdns3/cdns3-starfive.c
@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0
-/**
+/*
  * cdns3-starfive.c - StarFive specific Glue layer for Cadence USB Controller
  *
  * Copyright (C) 2023 StarFive Technology Co., Ltd.
diff --git a/drivers/usb/cdns3/cdnsp-debug.h b/drivers/usb/cdns3/cdnsp-debug.h
index ad617b7455b9..cd138acdcce1 100644
--- a/drivers/usb/cdns3/cdnsp-debug.h
+++ b/drivers/usb/cdns3/cdnsp-debug.h
@@ -187,202 +187,202 @@ static inline const char *cdnsp_decode_trb(char *str, size_t size, u32 field0,
 
 	switch (type) {
 	case TRB_LINK:
-		ret = snprintf(str, size,
-			       "LINK %08x%08x intr %ld type '%s' flags %c:%c:%c:%c",
-			       field1, field0, GET_INTR_TARGET(field2),
-			       cdnsp_trb_type_string(type),
-			       field3 & TRB_IOC ? 'I' : 'i',
-			       field3 & TRB_CHAIN ? 'C' : 'c',
-			       field3 & TRB_TC ? 'T' : 't',
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"LINK %08x%08x intr %ld type '%s' flags %c:%c:%c:%c",
+				field1, field0, GET_INTR_TARGET(field2),
+				cdnsp_trb_type_string(type),
+				field3 & TRB_IOC ? 'I' : 'i',
+				field3 & TRB_CHAIN ? 'C' : 'c',
+				field3 & TRB_TC ? 'T' : 't',
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_TRANSFER:
 	case TRB_COMPLETION:
 	case TRB_PORT_STATUS:
 	case TRB_HC_EVENT:
-		ret = snprintf(str, size,
-			       "ep%d%s(%d) type '%s' TRB %08x%08x status '%s'"
-			       " len %ld slot %ld flags %c:%c",
-			       ep_num, ep_id % 2 ? "out" : "in",
-			       TRB_TO_EP_INDEX(field3),
-			       cdnsp_trb_type_string(type), field1, field0,
-			       cdnsp_trb_comp_code_string(GET_COMP_CODE(field2)),
-			       EVENT_TRB_LEN(field2), TRB_TO_SLOT_ID(field3),
-			       field3 & EVENT_DATA ? 'E' : 'e',
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"ep%d%s(%d) type '%s' TRB %08x%08x status '%s'"
+				" len %ld slot %ld flags %c:%c",
+				ep_num, ep_id % 2 ? "out" : "in",
+				TRB_TO_EP_INDEX(field3),
+				cdnsp_trb_type_string(type), field1, field0,
+				cdnsp_trb_comp_code_string(GET_COMP_CODE(field2)),
+				EVENT_TRB_LEN(field2), TRB_TO_SLOT_ID(field3),
+				field3 & EVENT_DATA ? 'E' : 'e',
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_MFINDEX_WRAP:
-		ret = snprintf(str, size, "%s: flags %c",
-			       cdnsp_trb_type_string(type),
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size, "%s: flags %c",
+				cdnsp_trb_type_string(type),
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_SETUP:
-		ret = snprintf(str, size,
-			       "type '%s' bRequestType %02x bRequest %02x "
-			       "wValue %02x%02x wIndex %02x%02x wLength %d "
-			       "length %ld TD size %ld intr %ld Setup ID %ld "
-			       "flags %c:%c:%c",
-			       cdnsp_trb_type_string(type),
-			       field0 & 0xff,
-			       (field0 & 0xff00) >> 8,
-			       (field0 & 0xff000000) >> 24,
-			       (field0 & 0xff0000) >> 16,
-			       (field1 & 0xff00) >> 8,
-			       field1 & 0xff,
-			       (field1 & 0xff000000) >> 16 |
-			       (field1 & 0xff0000) >> 16,
-			       TRB_LEN(field2), GET_TD_SIZE(field2),
-			       GET_INTR_TARGET(field2),
-			       TRB_SETUPID_TO_TYPE(field3),
-			       field3 & TRB_IDT ? 'D' : 'd',
-			       field3 & TRB_IOC ? 'I' : 'i',
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"type '%s' bRequestType %02x bRequest %02x "
+				"wValue %02x%02x wIndex %02x%02x wLength %d "
+				"length %ld TD size %ld intr %ld Setup ID %ld "
+				"flags %c:%c:%c",
+				cdnsp_trb_type_string(type),
+				field0 & 0xff,
+				(field0 & 0xff00) >> 8,
+				(field0 & 0xff000000) >> 24,
+				(field0 & 0xff0000) >> 16,
+				(field1 & 0xff00) >> 8,
+				field1 & 0xff,
+				(field1 & 0xff000000) >> 16 |
+				(field1 & 0xff0000) >> 16,
+				TRB_LEN(field2), GET_TD_SIZE(field2),
+				GET_INTR_TARGET(field2),
+				TRB_SETUPID_TO_TYPE(field3),
+				field3 & TRB_IDT ? 'D' : 'd',
+				field3 & TRB_IOC ? 'I' : 'i',
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_DATA:
-		ret = snprintf(str, size,
-			       "type '%s' Buffer %08x%08x length %ld TD size %ld "
-			       "intr %ld flags %c:%c:%c:%c:%c:%c:%c",
-			       cdnsp_trb_type_string(type),
-			       field1, field0, TRB_LEN(field2),
-			       GET_TD_SIZE(field2),
-			       GET_INTR_TARGET(field2),
-			       field3 & TRB_IDT ? 'D' : 'i',
-			       field3 & TRB_IOC ? 'I' : 'i',
-			       field3 & TRB_CHAIN ? 'C' : 'c',
-			       field3 & TRB_NO_SNOOP ? 'S' : 's',
-			       field3 & TRB_ISP ? 'I' : 'i',
-			       field3 & TRB_ENT ? 'E' : 'e',
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"type '%s' Buffer %08x%08x length %ld TD size %ld "
+				"intr %ld flags %c:%c:%c:%c:%c:%c:%c",
+				cdnsp_trb_type_string(type),
+				field1, field0, TRB_LEN(field2),
+				GET_TD_SIZE(field2),
+				GET_INTR_TARGET(field2),
+				field3 & TRB_IDT ? 'D' : 'i',
+				field3 & TRB_IOC ? 'I' : 'i',
+				field3 & TRB_CHAIN ? 'C' : 'c',
+				field3 & TRB_NO_SNOOP ? 'S' : 's',
+				field3 & TRB_ISP ? 'I' : 'i',
+				field3 & TRB_ENT ? 'E' : 'e',
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_STATUS:
-		ret = snprintf(str, size,
-			       "Buffer %08x%08x length %ld TD size %ld intr"
-			       "%ld type '%s' flags %c:%c:%c:%c",
-			       field1, field0, TRB_LEN(field2),
-			       GET_TD_SIZE(field2),
-			       GET_INTR_TARGET(field2),
-			       cdnsp_trb_type_string(type),
-			       field3 & TRB_IOC ? 'I' : 'i',
-			       field3 & TRB_CHAIN ? 'C' : 'c',
-			       field3 & TRB_ENT ? 'E' : 'e',
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"Buffer %08x%08x length %ld TD size %ld intr"
+				"%ld type '%s' flags %c:%c:%c:%c",
+				field1, field0, TRB_LEN(field2),
+				GET_TD_SIZE(field2),
+				GET_INTR_TARGET(field2),
+				cdnsp_trb_type_string(type),
+				field3 & TRB_IOC ? 'I' : 'i',
+				field3 & TRB_CHAIN ? 'C' : 'c',
+				field3 & TRB_ENT ? 'E' : 'e',
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_NORMAL:
 	case TRB_ISOC:
 	case TRB_EVENT_DATA:
 	case TRB_TR_NOOP:
-		ret = snprintf(str, size,
-			       "type '%s' Buffer %08x%08x length %ld "
-			       "TD size %ld intr %ld "
-			       "flags %c:%c:%c:%c:%c:%c:%c:%c:%c",
-			       cdnsp_trb_type_string(type),
-			       field1, field0, TRB_LEN(field2),
-			       GET_TD_SIZE(field2),
-			       GET_INTR_TARGET(field2),
-			       field3 & TRB_BEI ? 'B' : 'b',
-			       field3 & TRB_IDT ? 'T' : 't',
-			       field3 & TRB_IOC ? 'I' : 'i',
-			       field3 & TRB_CHAIN ? 'C' : 'c',
-			       field3 & TRB_NO_SNOOP ? 'S' : 's',
-			       field3 & TRB_ISP ? 'I' : 'i',
-			       field3 & TRB_ENT ? 'E' : 'e',
-			       field3 & TRB_CYCLE ? 'C' : 'c',
-			       !(field3 & TRB_EVENT_INVALIDATE) ? 'V' : 'v');
+		ret = scnprintf(str, size,
+				"type '%s' Buffer %08x%08x length %ld "
+				"TD size %ld intr %ld "
+				"flags %c:%c:%c:%c:%c:%c:%c:%c:%c",
+				cdnsp_trb_type_string(type),
+				field1, field0, TRB_LEN(field2),
+				GET_TD_SIZE(field2),
+				GET_INTR_TARGET(field2),
+				field3 & TRB_BEI ? 'B' : 'b',
+				field3 & TRB_IDT ? 'T' : 't',
+				field3 & TRB_IOC ? 'I' : 'i',
+				field3 & TRB_CHAIN ? 'C' : 'c',
+				field3 & TRB_NO_SNOOP ? 'S' : 's',
+				field3 & TRB_ISP ? 'I' : 'i',
+				field3 & TRB_ENT ? 'E' : 'e',
+				field3 & TRB_CYCLE ? 'C' : 'c',
+				!(field3 & TRB_EVENT_INVALIDATE) ? 'V' : 'v');
 		break;
 	case TRB_CMD_NOOP:
 	case TRB_ENABLE_SLOT:
-		ret = snprintf(str, size, "%s: flags %c",
-			       cdnsp_trb_type_string(type),
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size, "%s: flags %c",
+				cdnsp_trb_type_string(type),
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_DISABLE_SLOT:
-		ret = snprintf(str, size, "%s: slot %ld flags %c",
-			       cdnsp_trb_type_string(type),
-			       TRB_TO_SLOT_ID(field3),
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size, "%s: slot %ld flags %c",
+				cdnsp_trb_type_string(type),
+				TRB_TO_SLOT_ID(field3),
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_ADDR_DEV:
-		ret = snprintf(str, size,
-			       "%s: ctx %08x%08x slot %ld flags %c:%c",
-			       cdnsp_trb_type_string(type), field1, field0,
-			       TRB_TO_SLOT_ID(field3),
-			       field3 & TRB_BSR ? 'B' : 'b',
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"%s: ctx %08x%08x slot %ld flags %c:%c",
+				cdnsp_trb_type_string(type), field1, field0,
+				TRB_TO_SLOT_ID(field3),
+				field3 & TRB_BSR ? 'B' : 'b',
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_CONFIG_EP:
-		ret = snprintf(str, size,
-			       "%s: ctx %08x%08x slot %ld flags %c:%c",
-			       cdnsp_trb_type_string(type), field1, field0,
-			       TRB_TO_SLOT_ID(field3),
-			       field3 & TRB_DC ? 'D' : 'd',
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"%s: ctx %08x%08x slot %ld flags %c:%c",
+				cdnsp_trb_type_string(type), field1, field0,
+				TRB_TO_SLOT_ID(field3),
+				field3 & TRB_DC ? 'D' : 'd',
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_EVAL_CONTEXT:
-		ret = snprintf(str, size,
-			       "%s: ctx %08x%08x slot %ld flags %c",
-			       cdnsp_trb_type_string(type), field1, field0,
-			       TRB_TO_SLOT_ID(field3),
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"%s: ctx %08x%08x slot %ld flags %c",
+				cdnsp_trb_type_string(type), field1, field0,
+				TRB_TO_SLOT_ID(field3),
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_RESET_EP:
 	case TRB_HALT_ENDPOINT:
-		ret = snprintf(str, size,
-			       "%s: ep%d%s(%d) ctx %08x%08x slot %ld flags %c",
-			       cdnsp_trb_type_string(type),
-			       ep_num, ep_id % 2 ? "out" : "in",
-			       TRB_TO_EP_INDEX(field3), field1, field0,
-			       TRB_TO_SLOT_ID(field3),
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"%s: ep%d%s(%d) ctx %08x%08x slot %ld flags %c",
+				cdnsp_trb_type_string(type),
+				ep_num, ep_id % 2 ? "out" : "in",
+				TRB_TO_EP_INDEX(field3), field1, field0,
+				TRB_TO_SLOT_ID(field3),
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_STOP_RING:
-		ret = snprintf(str, size,
-			       "%s: ep%d%s(%d) slot %ld sp %d flags %c",
-			       cdnsp_trb_type_string(type),
-			       ep_num, ep_id % 2 ? "out" : "in",
-			       TRB_TO_EP_INDEX(field3),
-			       TRB_TO_SLOT_ID(field3),
-			       TRB_TO_SUSPEND_PORT(field3),
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"%s: ep%d%s(%d) slot %ld sp %d flags %c",
+				cdnsp_trb_type_string(type),
+				ep_num, ep_id % 2 ? "out" : "in",
+				TRB_TO_EP_INDEX(field3),
+				TRB_TO_SLOT_ID(field3),
+				TRB_TO_SUSPEND_PORT(field3),
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_SET_DEQ:
-		ret = snprintf(str, size,
-			       "%s: ep%d%s(%d) deq %08x%08x stream %ld slot %ld  flags %c",
-			       cdnsp_trb_type_string(type),
-			       ep_num, ep_id % 2 ? "out" : "in",
-			       TRB_TO_EP_INDEX(field3), field1, field0,
-			       TRB_TO_STREAM_ID(field2),
-			       TRB_TO_SLOT_ID(field3),
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"%s: ep%d%s(%d) deq %08x%08x stream %ld slot %ld  flags %c",
+				cdnsp_trb_type_string(type),
+				ep_num, ep_id % 2 ? "out" : "in",
+				TRB_TO_EP_INDEX(field3), field1, field0,
+				TRB_TO_STREAM_ID(field2),
+				TRB_TO_SLOT_ID(field3),
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_RESET_DEV:
-		ret = snprintf(str, size, "%s: slot %ld flags %c",
-			       cdnsp_trb_type_string(type),
-			       TRB_TO_SLOT_ID(field3),
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size, "%s: slot %ld flags %c",
+				cdnsp_trb_type_string(type),
+				TRB_TO_SLOT_ID(field3),
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	case TRB_ENDPOINT_NRDY:
 		temp = TRB_TO_HOST_STREAM(field2);
 
-		ret = snprintf(str, size,
-			       "%s: ep%d%s(%d) H_SID %x%s%s D_SID %lx flags %c:%c",
-			       cdnsp_trb_type_string(type),
-			       ep_num, ep_id % 2 ? "out" : "in",
-			       TRB_TO_EP_INDEX(field3), temp,
-			       temp == STREAM_PRIME_ACK ? "(PRIME)" : "",
-			       temp == STREAM_REJECTED ? "(REJECTED)" : "",
-			       TRB_TO_DEV_STREAM(field0),
-			       field3 & TRB_STAT ? 'S' : 's',
-			       field3 & TRB_CYCLE ? 'C' : 'c');
+		ret = scnprintf(str, size,
+				"%s: ep%d%s(%d) H_SID %x%s%s D_SID %lx flags %c:%c",
+				cdnsp_trb_type_string(type),
+				ep_num, ep_id % 2 ? "out" : "in",
+				TRB_TO_EP_INDEX(field3), temp,
+				temp == STREAM_PRIME_ACK ? "(PRIME)" : "",
+				temp == STREAM_REJECTED ? "(REJECTED)" : "",
+				TRB_TO_DEV_STREAM(field0),
+				field3 & TRB_STAT ? 'S' : 's',
+				field3 & TRB_CYCLE ? 'C' : 'c');
 		break;
 	default:
-		ret = snprintf(str, size,
-			       "type '%s' -> raw %08x %08x %08x %08x",
-			       cdnsp_trb_type_string(type),
-			       field0, field1, field2, field3);
+		ret = scnprintf(str, size,
+				"type '%s' -> raw %08x %08x %08x %08x",
+				cdnsp_trb_type_string(type),
+				field0, field1, field2, field3);
 	}
 
-	if (ret >= size)
-		pr_info("CDNSP: buffer overflowed.\n");
+	if (ret == size - 1)
+		pr_info("CDNSP: buffer may be truncated.\n");
 
 	return str;
 }
@@ -465,32 +465,32 @@ static inline const char *cdnsp_decode_portsc(char *str, size_t size,
 {
 	int ret;
 
-	ret = snprintf(str, size, "%s %s %s Link:%s PortSpeed:%d ",
-		       portsc & PORT_POWER ? "Powered" : "Powered-off",
-		       portsc & PORT_CONNECT ? "Connected" : "Not-connected",
-		       portsc & PORT_PED ? "Enabled" : "Disabled",
-		       cdnsp_portsc_link_state_string(portsc),
-		       DEV_PORT_SPEED(portsc));
+	ret = scnprintf(str, size, "%s %s %s Link:%s PortSpeed:%d ",
+			portsc & PORT_POWER ? "Powered" : "Powered-off",
+			portsc & PORT_CONNECT ? "Connected" : "Not-connected",
+			portsc & PORT_PED ? "Enabled" : "Disabled",
+			cdnsp_portsc_link_state_string(portsc),
+			DEV_PORT_SPEED(portsc));
 
 	if (portsc & PORT_RESET)
-		ret += snprintf(str + ret, size - ret, "In-Reset ");
+		ret += scnprintf(str + ret, size - ret, "In-Reset ");
 
-	ret += snprintf(str + ret, size - ret, "Change: ");
+	ret += scnprintf(str + ret, size - ret, "Change: ");
 	if (portsc & PORT_CSC)
-		ret += snprintf(str + ret, size - ret, "CSC ");
+		ret += scnprintf(str + ret, size - ret, "CSC ");
 	if (portsc & PORT_WRC)
-		ret += snprintf(str + ret, size - ret, "WRC ");
+		ret += scnprintf(str + ret, size - ret, "WRC ");
 	if (portsc & PORT_RC)
-		ret += snprintf(str + ret, size - ret, "PRC ");
+		ret += scnprintf(str + ret, size - ret, "PRC ");
 	if (portsc & PORT_PLC)
-		ret += snprintf(str + ret, size - ret, "PLC ");
+		ret += scnprintf(str + ret, size - ret, "PLC ");
 	if (portsc & PORT_CEC)
-		ret += snprintf(str + ret, size - ret, "CEC ");
-	ret += snprintf(str + ret, size - ret, "Wake: ");
+		ret += scnprintf(str + ret, size - ret, "CEC ");
+	ret += scnprintf(str + ret, size - ret, "Wake: ");
 	if (portsc & PORT_WKCONN_E)
-		ret += snprintf(str + ret, size - ret, "WCE ");
+		ret += scnprintf(str + ret, size - ret, "WCE ");
 	if (portsc & PORT_WKDISC_E)
-		ret += snprintf(str + ret, size - ret, "WDE ");
+		ret += scnprintf(str + ret, size - ret, "WDE ");
 
 	return str;
 }
@@ -562,20 +562,20 @@ static inline const char *cdnsp_decode_ep_context(char *str, size_t size,
 
 	avg = EP_AVG_TRB_LENGTH(tx_info);
 
-	ret = snprintf(str, size, "State %s mult %d max P. Streams %d %s",
-		       cdnsp_ep_state_string(ep_state), mult,
-		       max_pstr, lsa ? "LSA " : "");
+	ret = scnprintf(str, size, "State %s mult %d max P. Streams %d %s",
+			cdnsp_ep_state_string(ep_state), mult,
+			max_pstr, lsa ? "LSA " : "");
 
-	ret += snprintf(str + ret, size - ret,
-			"interval %d us max ESIT payload %d CErr %d ",
-			(1 << interval) * 125, esit, cerr);
+	ret += scnprintf(str + ret, size - ret,
+			 "interval %d us max ESIT payload %d CErr %d ",
+			 (1 << interval) * 125, esit, cerr);
 
-	ret += snprintf(str + ret, size - ret,
-			"Type %s %sburst %d maxp %d deq %016llx ",
-			cdnsp_ep_type_string(ep_type), hid ? "HID" : "",
-			burst, maxp, deq);
+	ret += scnprintf(str + ret, size - ret,
+			 "Type %s %sburst %d maxp %d deq %016llx ",
+			 cdnsp_ep_type_string(ep_type), hid ? "HID" : "",
+			 burst, maxp, deq);
 
-	ret += snprintf(str + ret, size - ret, "avg trb len %d", avg);
+	ret += scnprintf(str + ret, size - ret, "avg trb len %d", avg);
 
 	return str;
 }
diff --git a/drivers/usb/cdns3/cdnsp-ring.c b/drivers/usb/cdns3/cdnsp-ring.c
index af981778382d..02f297f5637d 100644
--- a/drivers/usb/cdns3/cdnsp-ring.c
+++ b/drivers/usb/cdns3/cdnsp-ring.c
@@ -1529,6 +1529,7 @@ irqreturn_t cdnsp_thread_irq_handler(int irq, void *data)
 	unsigned long flags;
 	int counter = 0;
 
+	local_bh_disable();
 	spin_lock_irqsave(&pdev->lock, flags);
 
 	if (pdev->cdnsp_state & (CDNSP_STATE_HALTED | CDNSP_STATE_DYING)) {
@@ -1541,6 +1542,7 @@ irqreturn_t cdnsp_thread_irq_handler(int irq, void *data)
 			cdnsp_died(pdev);
 
 		spin_unlock_irqrestore(&pdev->lock, flags);
+		local_bh_enable();
 		return IRQ_HANDLED;
 	}
 
@@ -1557,6 +1559,7 @@ irqreturn_t cdnsp_thread_irq_handler(int irq, void *data)
 	cdnsp_update_erst_dequeue(pdev, event_ring_deq, 1);
 
 	spin_unlock_irqrestore(&pdev->lock, flags);
+	local_bh_enable();
 
 	return IRQ_HANDLED;
 }