1 files changed, 771 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
new file mode 100644
index 000000000..579899eb2
--- /dev/null
+++ b/drivers/usb/host/xhci-mtk-sch.c
@@ -0,0 +1,771 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author:
+ *  Zhigang.Wei <zhigang.wei@mediatek.com>
+ *  Chunfeng.Yun <chunfeng.yun@mediatek.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+
+#include "xhci.h"
+#include "xhci-mtk.h"
+
+#define SSP_BW_BOUNDARY	130000
+#define SS_BW_BOUNDARY	51000
+/* table 5-5. High-speed Isoc Transaction Limits in usb_20 spec */
+#define HS_BW_BOUNDARY	6144
+/* usb2 spec section11.18.1: at most 188 FS bytes per microframe */
+#define FS_PAYLOAD_MAX 188
+
+#define DBG_BUF_EN	64
+
+/* schedule error type */
+#define ESCH_SS_Y6		1001
+#define ESCH_SS_OVERLAP		1002
+#define ESCH_CS_OVERFLOW	1003
+#define ESCH_BW_OVERFLOW	1004
+#define ESCH_FIXME		1005
+
+/* mtk scheduler bitmasks */
+#define EP_BPKTS(p)	((p) & 0x7f)
+#define EP_BCSCOUNT(p)	(((p) & 0x7) << 8)
+#define EP_BBM(p)	((p) << 11)
+#define EP_BOFFSET(p)	((p) & 0x3fff)
+#define EP_BREPEAT(p)	(((p) & 0x7fff) << 16)
+
+static char *sch_error_string(int err_num)
+{
+	switch (err_num) {
+	case ESCH_SS_Y6:
+		return "Can't schedule Start-Split in Y6";
+	case ESCH_SS_OVERLAP:
+		return "Can't find a suitable Start-Split location";
+	case ESCH_CS_OVERFLOW:
+		return "The last Complete-Split is greater than 7";
+	case ESCH_BW_OVERFLOW:
+		return "Bandwidth exceeds the maximum limit";
+	case ESCH_FIXME:
+		return "FIXME, to be resolved";
+	default:
+		return "Unknown";
+	}
+}
+
+static int is_fs_or_ls(enum usb_device_speed speed)
+{
+	return speed == USB_SPEED_FULL || speed == USB_SPEED_LOW;
+}
+
+static const char *
+decode_ep(struct usb_host_endpoint *ep, enum usb_device_speed speed)
+{
+	static char buf[DBG_BUF_EN];
+	struct usb_endpoint_descriptor *epd = &ep->desc;
+	unsigned int interval;
+	const char *unit;
+
+	interval = usb_decode_interval(epd, speed);
+	if (interval % 1000) {
+		unit = "us";
+	} else {
+		unit = "ms";
+		interval /= 1000;
+	}
+
+	snprintf(buf, DBG_BUF_EN, "%s ep%d%s %s, mpkt:%d, interval:%d/%d%s",
+		 usb_speed_string(speed), usb_endpoint_num(epd),
+		 usb_endpoint_dir_in(epd) ? "in" : "out",
+		 usb_ep_type_string(usb_endpoint_type(epd)),
+		 usb_endpoint_maxp(epd), epd->bInterval, interval, unit);
+
+	return buf;
+}
+
+static u32 get_bw_boundary(enum usb_device_speed speed)
+{
+	u32 boundary;
+
+	switch (speed) {
+	case USB_SPEED_SUPER_PLUS:
+		boundary = SSP_BW_BOUNDARY;
+		break;
+	case USB_SPEED_SUPER:
+		boundary = SS_BW_BOUNDARY;
+		break;
+	default:
+		boundary = HS_BW_BOUNDARY;
+		break;
+	}
+
+	return boundary;
+}
+
+/*
+* get the bandwidth domain which @ep belongs to.
+*
+* the bandwidth domain array is saved to @sch_array of struct xhci_hcd_mtk,
+* each HS root port is treated as a single bandwidth domain,
+* but each SS root port is treated as two bandwidth domains, one for IN eps,
+* one for OUT eps.
+* @real_port value is defined as follow according to xHCI spec:
+* 1 for SSport0, ..., N+1 for SSportN, N+2 for HSport0, N+3 for HSport1, etc
+* so the bandwidth domain array is organized as follow for simplification:
+* SSport0-OUT, SSport0-IN, ..., SSportX-OUT, SSportX-IN, HSport0, ..., HSportY
+*/
+static struct mu3h_sch_bw_info *
+get_bw_info(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
+	    struct usb_host_endpoint *ep)
+{
+	struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
+	struct xhci_virt_device *virt_dev;
+	int bw_index;
+
+	virt_dev = xhci->devs[udev->slot_id];
+	if (!virt_dev->real_port) {
+		WARN_ONCE(1, "%s invalid real_port\n", dev_name(&udev->dev));
+		return NULL;
+	}
+
+	if (udev->speed >= USB_SPEED_SUPER) {
+		if (usb_endpoint_dir_out(&ep->desc))
+			bw_index = (virt_dev->real_port - 1) * 2;
+		else
+			bw_index = (virt_dev->real_port - 1) * 2 + 1;
+	} else {
+		/* add one more for each SS port */
+		bw_index = virt_dev->real_port + xhci->usb3_rhub.num_ports - 1;
+	}
+
+	return &mtk->sch_array[bw_index];
+}
+
+static u32 get_esit(struct xhci_ep_ctx *ep_ctx)
+{
+	u32 esit;
+
+	esit = 1 << CTX_TO_EP_INTERVAL(le32_to_cpu(ep_ctx->ep_info));
+	if (esit > XHCI_MTK_MAX_ESIT)
+		esit = XHCI_MTK_MAX_ESIT;
+
+	return esit;
+}
+
+static struct mu3h_sch_tt *find_tt(struct usb_device *udev)
+{
+	struct usb_tt *utt = udev->tt;
+	struct mu3h_sch_tt *tt, **tt_index, **ptt;
+	bool allocated_index = false;
+
+	if (!utt)
+		return NULL;	/* Not below a TT */
+
+	/*
+	 * Find/create our data structure.
+	 * For hubs with a single TT, we get it directly.
+	 * For hubs with multiple TTs, there's an extra level of pointers.
+	 */
+	tt_index = NULL;
+	if (utt->multi) {
+		tt_index = utt->hcpriv;
+		if (!tt_index) {	/* Create the index array */
+			tt_index = kcalloc(utt->hub->maxchild,
+					sizeof(*tt_index), GFP_KERNEL);
+			if (!tt_index)
+				return ERR_PTR(-ENOMEM);
+			utt->hcpriv = tt_index;
+			allocated_index = true;
+		}
+		ptt = &tt_index[udev->ttport - 1];
+	} else {
+		ptt = (struct mu3h_sch_tt **) &utt->hcpriv;
+	}
+
+	tt = *ptt;
+	if (!tt) {	/* Create the mu3h_sch_tt */
+		tt = kzalloc(sizeof(*tt), GFP_KERNEL);
+		if (!tt) {
+			if (allocated_index) {
+				utt->hcpriv = NULL;
+				kfree(tt_index);
+			}
+			return ERR_PTR(-ENOMEM);
+		}
+		INIT_LIST_HEAD(&tt->ep_list);
+		*ptt = tt;
+	}
+
+	return tt;
+}
+
+/* Release the TT above udev, if it's not in use */
+static void drop_tt(struct usb_device *udev)
+{
+	struct usb_tt *utt = udev->tt;
+	struct mu3h_sch_tt *tt, **tt_index, **ptt;
+	int i, cnt;
+
+	if (!utt || !utt->hcpriv)
+		return;		/* Not below a TT, or never allocated */
+
+	cnt = 0;
+	if (utt->multi) {
+		tt_index = utt->hcpriv;
+		ptt = &tt_index[udev->ttport - 1];
+		/*  How many entries are left in tt_index? */
+		for (i = 0; i < utt->hub->maxchild; ++i)
+			cnt += !!tt_index[i];
+	} else {
+		tt_index = NULL;
+		ptt = (struct mu3h_sch_tt **)&utt->hcpriv;
+	}
+
+	tt = *ptt;
+	if (!tt || !list_empty(&tt->ep_list))
+		return;		/* never allocated , or still in use*/
+
+	*ptt = NULL;
+	kfree(tt);
+
+	if (cnt == 1) {
+		utt->hcpriv = NULL;
+		kfree(tt_index);
+	}
+}
+
+static struct mu3h_sch_ep_info *
+create_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
+	      struct usb_host_endpoint *ep)
+{
+	struct mu3h_sch_ep_info *sch_ep;
+	struct mu3h_sch_bw_info *bw_info;
+	struct mu3h_sch_tt *tt = NULL;
+
+	bw_info = get_bw_info(mtk, udev, ep);
+	if (!bw_info)
+		return ERR_PTR(-ENODEV);
+
+	sch_ep = kzalloc(sizeof(*sch_ep), GFP_KERNEL);
+	if (!sch_ep)
+		return ERR_PTR(-ENOMEM);
+
+	if (is_fs_or_ls(udev->speed)) {
+		tt = find_tt(udev);
+		if (IS_ERR(tt)) {
+			kfree(sch_ep);
+			return ERR_PTR(-ENOMEM);
+		}
+	}
+
+	sch_ep->bw_info = bw_info;
+	sch_ep->sch_tt = tt;
+	sch_ep->ep = ep;
+	sch_ep->speed = udev->speed;
+	INIT_LIST_HEAD(&sch_ep->endpoint);
+	INIT_LIST_HEAD(&sch_ep->tt_endpoint);
+	INIT_HLIST_NODE(&sch_ep->hentry);
+
+	return sch_ep;
+}
+
+static void setup_sch_info(struct xhci_ep_ctx *ep_ctx,
+			   struct mu3h_sch_ep_info *sch_ep)
+{
+	u32 ep_type;
+	u32 maxpkt;
+	u32 max_burst;
+	u32 mult;
+	u32 esit_pkts;
+	u32 max_esit_payload;
+
+	ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2));
+	maxpkt = MAX_PACKET_DECODED(le32_to_cpu(ep_ctx->ep_info2));
+	max_burst = CTX_TO_MAX_BURST(le32_to_cpu(ep_ctx->ep_info2));
+	mult = CTX_TO_EP_MULT(le32_to_cpu(ep_ctx->ep_info));
+	max_esit_payload =
+		(CTX_TO_MAX_ESIT_PAYLOAD_HI(
+			le32_to_cpu(ep_ctx->ep_info)) << 16) |
+		 CTX_TO_MAX_ESIT_PAYLOAD(le32_to_cpu(ep_ctx->tx_info));
+
+	sch_ep->esit = get_esit(ep_ctx);
+	sch_ep->num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
+	sch_ep->ep_type = ep_type;
+	sch_ep->maxpkt = maxpkt;
+	sch_ep->offset = 0;
+	sch_ep->burst_mode = 0;
+	sch_ep->repeat = 0;
+
+	if (sch_ep->speed == USB_SPEED_HIGH) {
+		sch_ep->cs_count = 0;
+
+		/*
+		 * usb_20 spec section5.9
+		 * a single microframe is enough for HS synchromous endpoints
+		 * in a interval
+		 */
+		sch_ep->num_budget_microframes = 1;
+
+		/*
+		 * xHCI spec section6.2.3.4
+		 * @max_burst is the number of additional transactions
+		 * opportunities per microframe
+		 */
+		sch_ep->pkts = max_burst + 1;
+		sch_ep->bw_cost_per_microframe = maxpkt * sch_ep->pkts;
+	} else if (sch_ep->speed >= USB_SPEED_SUPER) {
+		/* usb3_r1 spec section4.4.7 & 4.4.8 */
+		sch_ep->cs_count = 0;
+		sch_ep->burst_mode = 1;
+		/*
+		 * some device's (d)wBytesPerInterval is set as 0,
+		 * then max_esit_payload is 0, so evaluate esit_pkts from
+		 * mult and burst
+		 */
+		esit_pkts = DIV_ROUND_UP(max_esit_payload, maxpkt);
+		if (esit_pkts == 0)
+			esit_pkts = (mult + 1) * (max_burst + 1);
+
+		if (ep_type == INT_IN_EP || ep_type == INT_OUT_EP) {
+			sch_ep->pkts = esit_pkts;
+			sch_ep->num_budget_microframes = 1;
+		}
+
+		if (ep_type == ISOC_IN_EP || ep_type == ISOC_OUT_EP) {
+
+			if (sch_ep->esit == 1)
+				sch_ep->pkts = esit_pkts;
+			else if (esit_pkts <= sch_ep->esit)
+				sch_ep->pkts = 1;
+			else
+				sch_ep->pkts = roundup_pow_of_two(esit_pkts)
+					/ sch_ep->esit;
+
+			sch_ep->num_budget_microframes =
+				DIV_ROUND_UP(esit_pkts, sch_ep->pkts);
+
+			sch_ep->repeat = !!(sch_ep->num_budget_microframes > 1);
+		}
+		sch_ep->bw_cost_per_microframe = maxpkt * sch_ep->pkts;
+	} else if (is_fs_or_ls(sch_ep->speed)) {
+		sch_ep->pkts = 1; /* at most one packet for each microframe */
+
+		/*
+		 * num_budget_microframes and cs_count will be updated when
+		 * check TT for INT_OUT_EP, ISOC/INT_IN_EP type
+		 */
+		sch_ep->cs_count = DIV_ROUND_UP(maxpkt, FS_PAYLOAD_MAX);
+		sch_ep->num_budget_microframes = sch_ep->cs_count;
+		sch_ep->bw_cost_per_microframe = min_t(u32, maxpkt, FS_PAYLOAD_MAX);
+	}
+}
+
+/* Get maximum bandwidth when we schedule at offset slot. */
+static u32 get_max_bw(struct mu3h_sch_bw_info *sch_bw,
+	struct mu3h_sch_ep_info *sch_ep, u32 offset)
+{
+	u32 max_bw = 0;
+	u32 bw;
+	int i, j, k;
+
+	for (i = 0; i < sch_ep->num_esit; i++) {
+		u32 base = offset + i * sch_ep->esit;
+
+		for (j = 0; j < sch_ep->num_budget_microframes; j++) {
+			k = XHCI_MTK_BW_INDEX(base + j);
+			bw = sch_bw->bus_bw[k] + sch_ep->bw_cost_per_microframe;
+			if (bw > max_bw)
+				max_bw = bw;
+		}
+	}
+	return max_bw;
+}
+
+static void update_bus_bw(struct mu3h_sch_bw_info *sch_bw,
+	struct mu3h_sch_ep_info *sch_ep, bool used)
+{
+	int bw_updated;
+	u32 base;
+	int i, j;
+
+	bw_updated = sch_ep->bw_cost_per_microframe * (used ? 1 : -1);
+
+	for (i = 0; i < sch_ep->num_esit; i++) {
+		base = sch_ep->offset + i * sch_ep->esit;
+		for (j = 0; j < sch_ep->num_budget_microframes; j++)
+			sch_bw->bus_bw[XHCI_MTK_BW_INDEX(base + j)] += bw_updated;
+	}
+}
+
+static int check_fs_bus_bw(struct mu3h_sch_ep_info *sch_ep, int offset)
+{
+	struct mu3h_sch_tt *tt = sch_ep->sch_tt;
+	u32 tmp;
+	int base;
+	int i, j, k;
+
+	for (i = 0; i < sch_ep->num_esit; i++) {
+		base = offset + i * sch_ep->esit;
+
+		/*
+		 * Compared with hs bus, no matter what ep type,
+		 * the hub will always delay one uframe to send data
+		 */
+		for (j = 0; j < sch_ep->num_budget_microframes; j++) {
+			k = XHCI_MTK_BW_INDEX(base + j);
+			tmp = tt->fs_bus_bw[k] + sch_ep->bw_cost_per_microframe;
+			if (tmp > FS_PAYLOAD_MAX)
+				return -ESCH_BW_OVERFLOW;
+		}
+	}
+
+	return 0;
+}
+
+static int check_sch_tt(struct mu3h_sch_ep_info *sch_ep, u32 offset)
+{
+	u32 start_ss, last_ss;
+	u32 start_cs, last_cs;
+
+	if (!sch_ep->sch_tt)
+		return 0;
+
+	start_ss = offset % 8;
+
+	if (sch_ep->ep_type == ISOC_OUT_EP) {
+		last_ss = start_ss + sch_ep->cs_count - 1;
+
+		/*
+		 * usb_20 spec section11.18:
+		 * must never schedule Start-Split in Y6
+		 */
+		if (!(start_ss == 7 || last_ss < 6))
+			return -ESCH_SS_Y6;
+
+	} else {
+		u32 cs_count = DIV_ROUND_UP(sch_ep->maxpkt, FS_PAYLOAD_MAX);
+
+		/*
+		 * usb_20 spec section11.18:
+		 * must never schedule Start-Split in Y6
+		 */
+		if (start_ss == 6)
+			return -ESCH_SS_Y6;
+
+		/* one uframe for ss + one uframe for idle */
+		start_cs = (start_ss + 2) % 8;
+		last_cs = start_cs + cs_count - 1;
+
+		if (last_cs > 7)
+			return -ESCH_CS_OVERFLOW;
+
+		if (cs_count > 7)
+			cs_count = 7; /* HW limit */
+
+		sch_ep->cs_count = cs_count;
+		/* ss, idle are ignored */
+		sch_ep->num_budget_microframes = cs_count;
+
+		/*
+		 * if interval=1, maxp >752, num_budge_micoframe is larger
+		 * than sch_ep->esit, will overstep boundary
+		 */
+		if (sch_ep->num_budget_microframes > sch_ep->esit)
+			sch_ep->num_budget_microframes = sch_ep->esit;
+	}
+
+	return check_fs_bus_bw(sch_ep, offset);
+}
+
+static void update_sch_tt(struct mu3h_sch_ep_info *sch_ep, bool used)
+{
+	struct mu3h_sch_tt *tt = sch_ep->sch_tt;
+	int bw_updated;
+	u32 base;
+	int i, j;
+
+	bw_updated = sch_ep->bw_cost_per_microframe * (used ? 1 : -1);
+
+	for (i = 0; i < sch_ep->num_esit; i++) {
+		base = sch_ep->offset + i * sch_ep->esit;
+
+		for (j = 0; j < sch_ep->num_budget_microframes; j++)
+			tt->fs_bus_bw[XHCI_MTK_BW_INDEX(base + j)] += bw_updated;
+	}
+
+	if (used)
+		list_add_tail(&sch_ep->tt_endpoint, &tt->ep_list);
+	else
+		list_del(&sch_ep->tt_endpoint);
+}
+
+static int load_ep_bw(struct mu3h_sch_bw_info *sch_bw,
+		      struct mu3h_sch_ep_info *sch_ep, bool loaded)
+{
+	if (sch_ep->sch_tt)
+		update_sch_tt(sch_ep, loaded);
+
+	/* update bus bandwidth info */
+	update_bus_bw(sch_bw, sch_ep, loaded);
+	sch_ep->allocated = loaded;
+
+	return 0;
+}
+
+static int check_sch_bw(struct mu3h_sch_ep_info *sch_ep)
+{
+	struct mu3h_sch_bw_info *sch_bw = sch_ep->bw_info;
+	const u32 bw_boundary = get_bw_boundary(sch_ep->speed);
+	u32 offset;
+	u32 worst_bw;
+	u32 min_bw = ~0;
+	int min_index = -1;
+	int ret = 0;
+
+	/*
+	 * Search through all possible schedule microframes.
+	 * and find a microframe where its worst bandwidth is minimum.
+	 */
+	for (offset = 0; offset < sch_ep->esit; offset++) {
+		ret = check_sch_tt(sch_ep, offset);
+		if (ret)
+			continue;
+
+		worst_bw = get_max_bw(sch_bw, sch_ep, offset);
+		if (worst_bw > bw_boundary)
+			continue;
+
+		if (min_bw > worst_bw) {
+			min_bw = worst_bw;
+			min_index = offset;
+		}
+
+		/* use first-fit for LS/FS */
+		if (sch_ep->sch_tt && min_index >= 0)
+			break;
+
+		if (min_bw == 0)
+			break;
+	}
+
+	if (min_index < 0)
+		return ret ? ret : -ESCH_BW_OVERFLOW;
+
+	sch_ep->offset = min_index;
+
+	return load_ep_bw(sch_bw, sch_ep, true);
+}
+
+static void destroy_sch_ep(struct xhci_hcd_mtk *mtk, struct usb_device *udev,
+			   struct mu3h_sch_ep_info *sch_ep)
+{
+	/* only release ep bw check passed by check_sch_bw() */
+	if (sch_ep->allocated)
+		load_ep_bw(sch_ep->bw_info, sch_ep, false);
+
+	if (sch_ep->sch_tt)
+		drop_tt(udev);
+
+	list_del(&sch_ep->endpoint);
+	hlist_del(&sch_ep->hentry);
+	kfree(sch_ep);
+}
+
+static bool need_bw_sch(struct usb_device *udev,
+			struct usb_host_endpoint *ep)
+{
+	bool has_tt = udev->tt && udev->tt->hub->parent;
+
+	/* only for periodic endpoints */
+	if (usb_endpoint_xfer_control(&ep->desc)
+		|| usb_endpoint_xfer_bulk(&ep->desc))
+		return false;
+
+	/*
+	 * for LS & FS periodic endpoints which its device is not behind
+	 * a TT are also ignored, root-hub will schedule them directly,
+	 * but need set @bpkts field of endpoint context to 1.
+	 */
+	if (is_fs_or_ls(udev->speed) && !has_tt)
+		return false;
+
+	/* skip endpoint with zero maxpkt */
+	if (usb_endpoint_maxp(&ep->desc) == 0)
+		return false;
+
+	return true;
+}
+
+int xhci_mtk_sch_init(struct xhci_hcd_mtk *mtk)
+{
+	struct xhci_hcd *xhci = hcd_to_xhci(mtk->hcd);
+	struct mu3h_sch_bw_info *sch_array;
+	int num_usb_bus;
+
+	/* ss IN and OUT are separated */
+	num_usb_bus = xhci->usb3_rhub.num_ports * 2 + xhci->usb2_rhub.num_ports;
+
+	sch_array = kcalloc(num_usb_bus, sizeof(*sch_array), GFP_KERNEL);
+	if (sch_array == NULL)
+		return -ENOMEM;
+
+	mtk->sch_array = sch_array;
+
+	INIT_LIST_HEAD(&mtk->bw_ep_chk_list);
+	hash_init(mtk->sch_ep_hash);
+
+	return 0;
+}
+
+void xhci_mtk_sch_exit(struct xhci_hcd_mtk *mtk)
+{
+	kfree(mtk->sch_array);
+}
+
+static int add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
+			struct usb_host_endpoint *ep)
+{
+	struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	struct xhci_ep_ctx *ep_ctx;
+	struct xhci_virt_device *virt_dev;
+	struct mu3h_sch_ep_info *sch_ep;
+	unsigned int ep_index;
+
+	virt_dev = xhci->devs[udev->slot_id];
+	ep_index = xhci_get_endpoint_index(&ep->desc);
+	ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
+
+	if (!need_bw_sch(udev, ep)) {
+		/*
+		 * set @bpkts to 1 if it is LS or FS periodic endpoint, and its
+		 * device does not connected through an external HS hub
+		 */
+		if (usb_endpoint_xfer_int(&ep->desc)
+			|| usb_endpoint_xfer_isoc(&ep->desc))
+			ep_ctx->reserved[0] = cpu_to_le32(EP_BPKTS(1));
+
+		return 0;
+	}
+
+	xhci_dbg(xhci, "%s %s\n", __func__, decode_ep(ep, udev->speed));
+
+	sch_ep = create_sch_ep(mtk, udev, ep);
+	if (IS_ERR_OR_NULL(sch_ep))
+		return -ENOMEM;
+
+	setup_sch_info(ep_ctx, sch_ep);
+
+	list_add_tail(&sch_ep->endpoint, &mtk->bw_ep_chk_list);
+	hash_add(mtk->sch_ep_hash, &sch_ep->hentry, (unsigned long)ep);
+
+	return 0;
+}
+
+static void drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
+			  struct usb_host_endpoint *ep)
+{
+	struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	struct mu3h_sch_ep_info *sch_ep;
+	struct hlist_node *hn;
+
+	if (!need_bw_sch(udev, ep))
+		return;
+
+	xhci_dbg(xhci, "%s %s\n", __func__, decode_ep(ep, udev->speed));
+
+	hash_for_each_possible_safe(mtk->sch_ep_hash, sch_ep,
+				    hn, hentry, (unsigned long)ep) {
+		if (sch_ep->ep == ep) {
+			destroy_sch_ep(mtk, udev, sch_ep);
+			break;
+		}
+	}
+}
+
+int xhci_mtk_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
+{
+	struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
+	struct mu3h_sch_ep_info *sch_ep;
+	int ret;
+
+	xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));
+
+	list_for_each_entry(sch_ep, &mtk->bw_ep_chk_list, endpoint) {
+		struct xhci_ep_ctx *ep_ctx;
+		struct usb_host_endpoint *ep = sch_ep->ep;
+		unsigned int ep_index = xhci_get_endpoint_index(&ep->desc);
+
+		ret = check_sch_bw(sch_ep);
+		if (ret) {
+			xhci_err(xhci, "Not enough bandwidth! (%s)\n",
+				 sch_error_string(-ret));
+			return -ENOSPC;
+		}
+
+		ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
+		ep_ctx->reserved[0] = cpu_to_le32(EP_BPKTS(sch_ep->pkts)
+			| EP_BCSCOUNT(sch_ep->cs_count)
+			| EP_BBM(sch_ep->burst_mode));
+		ep_ctx->reserved[1] = cpu_to_le32(EP_BOFFSET(sch_ep->offset)
+			| EP_BREPEAT(sch_ep->repeat));
+
+		xhci_dbg(xhci, " PKTS:%x, CSCOUNT:%x, BM:%x, OFFSET:%x, REPEAT:%x\n",
+			sch_ep->pkts, sch_ep->cs_count, sch_ep->burst_mode,
+			sch_ep->offset, sch_ep->repeat);
+	}
+
+	ret = xhci_check_bandwidth(hcd, udev);
+	if (!ret)
+		list_del_init(&mtk->bw_ep_chk_list);
+
+	return ret;
+}
+
+void xhci_mtk_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
+{
+	struct xhci_hcd_mtk *mtk = hcd_to_mtk(hcd);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	struct mu3h_sch_ep_info *sch_ep, *tmp;
+
+	xhci_dbg(xhci, "%s() udev %s\n", __func__, dev_name(&udev->dev));
+
+	list_for_each_entry_safe(sch_ep, tmp, &mtk->bw_ep_chk_list, endpoint)
+		destroy_sch_ep(mtk, udev, sch_ep);
+
+	xhci_reset_bandwidth(hcd, udev);
+}
+
+int xhci_mtk_add_ep(struct usb_hcd *hcd, struct usb_device *udev,
+		    struct usb_host_endpoint *ep)
+{
+	int ret;
+
+	ret = xhci_add_endpoint(hcd, udev, ep);
+	if (ret)
+		return ret;
+
+	if (ep->hcpriv)
+		ret = add_ep_quirk(hcd, udev, ep);
+
+	return ret;
+}
+
+int xhci_mtk_drop_ep(struct usb_hcd *hcd, struct usb_device *udev,
+		     struct usb_host_endpoint *ep)
+{
+	int ret;
+
+	ret = xhci_drop_endpoint(hcd, udev, ep);
+	if (ret)
+		return ret;
+
+	/* needn't check @ep->hcpriv, xhci_endpoint_disable set it NULL */
+	drop_ep_quirk(hcd, udev, ep);
+
+	return 0;
+}