+++ /dev/null
-From e604b6c864f2e3b6fe0706c4bef886533d92f67a Mon Sep 17 00:00:00 2001
-From: Chunfeng Yun <chunfeng.yun@mediatek.com>
-Date: Wed, 27 May 2015 19:48:02 +0800
-Subject: [PATCH 47/76] xhci: mediatek: support MTK xHCI host controller
-
-MTK xhci host controller defines some extra SW scheduling
-parameters for HW to minimize the scheduling effort for
-synchronous and interrupt endpoints. The parameters are
-put into reseved DWs of slot context and endpoint context.
-
-Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
----
- drivers/usb/host/Kconfig | 9 +
- drivers/usb/host/Makefile | 3 +
- drivers/usb/host/xhci-mtk.c | 470 ++++++++++++++++++++++++++++++++++++++++++
- drivers/usb/host/xhci-mtk.h | 119 +++++++++++
- drivers/usb/host/xhci-plat.c | 22 +-
- drivers/usb/host/xhci-ring.c | 35 +++-
- drivers/usb/host/xhci.c | 16 +-
- drivers/usb/host/xhci.h | 1 +
- 8 files changed, 667 insertions(+), 8 deletions(-)
- create mode 100644 drivers/usb/host/xhci-mtk.c
- create mode 100644 drivers/usb/host/xhci-mtk.h
-
---- a/drivers/usb/host/Kconfig
-+++ b/drivers/usb/host/Kconfig
-@@ -41,6 +41,15 @@ config USB_XHCI_PLATFORM
-
- If unsure, say N.
-
-+config USB_XHCI_MTK
-+ tristate "xHCI support for Mediatek MT65xx"
-+ select USB_XHCI_PLATFORM
-+ depends on ARCH_MEDIATEK || COMPILE_TEST
-+ ---help---
-+ Say 'Y' to enable the support for the xHCI host controller
-+ found in Mediatek MT65xx SoCs.
-+ If unsure, say N.
-+
- config USB_XHCI_MVEBU
- tristate "xHCI support for Marvell Armada 375/38x"
- select USB_XHCI_PLATFORM
---- a/drivers/usb/host/Makefile
-+++ b/drivers/usb/host/Makefile
-@@ -15,6 +15,9 @@ xhci-hcd-y += xhci-ring.o xhci-hub.o xhc
- xhci-hcd-y += xhci-trace.o
-
- xhci-plat-hcd-y := xhci-plat.o
-+ifneq ($(CONFIG_USB_XHCI_MTK), )
-+ xhci-plat-hcd-y += xhci-mtk.o
-+endif
- ifneq ($(CONFIG_USB_XHCI_MVEBU), )
- xhci-plat-hcd-y += xhci-mvebu.o
- endif
---- /dev/null
-+++ b/drivers/usb/host/xhci-mtk.c
-@@ -0,0 +1,470 @@
-+/*
-+ * Copyright (c) 2015 MediaTek Inc.
-+ * Author:
-+ * Zhigang.Wei <zhigang.wei@mediatek.com>
-+ * Chunfeng.Yun <chunfeng.yun@mediatek.com>
-+ *
-+ * This software is licensed under the terms of the GNU General Public
-+ * License version 2, as published by the Free Software Foundation, and
-+ * may be copied, distributed, and modified under those terms.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ *
-+ */
-+
-+#include <linux/kernel.h>
-+#include <linux/slab.h>
-+#include "xhci-mtk.h"
-+
-+
-+#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
-+
-+/* mtk scheduler bitmasks */
-+#define EP_BPKTS(p) ((p) & 0x3f)
-+#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 int is_fs_or_ls(enum usb_device_speed speed)
-+{
-+ return speed == USB_SPEED_FULL || speed == USB_SPEED_LOW;
-+}
-+
-+static int get_bw_index(struct xhci_hcd *xhci, struct usb_device *udev,
-+ struct usb_host_endpoint *ep)
-+{
-+ int bw_index;
-+ int port_id;
-+ struct xhci_virt_device *virt_dev;
-+
-+ virt_dev = xhci->devs[udev->slot_id];
-+ port_id = virt_dev->real_port;
-+
-+ if (udev->speed == USB_SPEED_SUPER) {
-+ if (usb_endpoint_dir_out(&ep->desc))
-+ bw_index = (port_id - 1) * 2;
-+ else
-+ bw_index = (port_id - 1) * 2 + 1;
-+ } else {
-+ bw_index = port_id + xhci->num_usb3_ports - 1;
-+ }
-+
-+ return bw_index;
-+}
-+
-+
-+static void setup_sch_info(struct usb_device *udev,
-+ struct xhci_ep_ctx *ep_ctx, struct mu3h_sch_ep_info *sch_ep)
-+{
-+ u32 ep_type;
-+ u32 ep_interval;
-+ u32 max_packet_size;
-+ u32 max_burst;
-+ u32 mult;
-+ u32 esit_pkts;
-+
-+ ep_type = CTX_TO_EP_TYPE(le32_to_cpu(ep_ctx->ep_info2));
-+ ep_interval = CTX_TO_EP_INTERVAL(le32_to_cpu(ep_ctx->ep_info));
-+ max_packet_size = 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));
-+ pr_debug("%s: max_burst = %d, mult = %d\n", __func__, max_burst, mult);
-+
-+ sch_ep->ep_type = ep_type;
-+ sch_ep->max_packet_size = max_packet_size;
-+ sch_ep->esit = 1 << ep_interval;
-+ sch_ep->offset = 0;
-+ sch_ep->burst_mode = 0;
-+
-+ if (udev->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;
-+ sch_ep->repeat = 0;
-+ /*
-+ * xHCI spec section6.2.3.4
-+ * @max_busrt is the number of additional transactions opportunities
-+ * per microframe
-+ */
-+ sch_ep->pkts = max_burst + 1;
-+ sch_ep->bw_cost_per_microframe = max_packet_size * sch_ep->pkts;
-+ } else if (udev->speed == USB_SPEED_SUPER) {
-+ /* usb3_r1 spec section4.4.7 & 4.4.8 */
-+ sch_ep->cs_count = 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;
-+ sch_ep->repeat = 0;
-+ }
-+
-+ if (ep_type == ISOC_IN_EP || ep_type == ISOC_OUT_EP) {
-+ 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);
-+
-+ if (sch_ep->num_budget_microframes > 1)
-+ sch_ep->repeat = 1;
-+ else
-+ sch_ep->repeat = 0;
-+ }
-+ sch_ep->bw_cost_per_microframe = max_packet_size * sch_ep->pkts;
-+ } else if (is_fs_or_ls(udev->speed)) {
-+ /*
-+ * usb_20 spec section11.18.4
-+ * assume worst cases
-+ */
-+ sch_ep->repeat = 0;
-+ sch_ep->pkts = 1; /* at most one packet for each microframe */
-+ if (ep_type == INT_IN_EP || ep_type == INT_OUT_EP) {
-+ sch_ep->cs_count = 3; /* at most need 3 CS*/
-+ /* one for SS and one for budgeted transaction */
-+ sch_ep->num_budget_microframes = sch_ep->cs_count + 2;
-+ sch_ep->bw_cost_per_microframe = max_packet_size;
-+ }
-+ if (ep_type == ISOC_OUT_EP) {
-+ /* must never schedule a cs ISOC OUT ep */
-+ sch_ep->cs_count = 0;
-+ /*
-+ * the best case FS budget assumes that 188 FS bytes
-+ * occur in each microframe
-+ */
-+ sch_ep->num_budget_microframes = DIV_ROUND_UP(
-+ sch_ep->max_packet_size, FS_PAYLOAD_MAX);
-+ sch_ep->bw_cost_per_microframe = FS_PAYLOAD_MAX;
-+ }
-+ if (ep_type == ISOC_IN_EP) {
-+ /* at most need additional two CS. */
-+ sch_ep->cs_count = DIV_ROUND_UP(
-+ sch_ep->max_packet_size, FS_PAYLOAD_MAX) + 2;
-+ sch_ep->num_budget_microframes = sch_ep->cs_count + 2;
-+ sch_ep->bw_cost_per_microframe = 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 num_esit;
-+ u32 max_bw = 0;
-+ int i;
-+ int j;
-+
-+ num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
-+ for (i = 0; i < num_esit; i++) {
-+ u32 base = offset + i * sch_ep->esit;
-+
-+ for (j = 0; j < sch_ep->num_budget_microframes; j++) {
-+ if (sch_bw->bus_bw[base + j] > max_bw)
-+ max_bw = sch_bw->bus_bw[base + j];
-+ }
-+ }
-+ return max_bw;
-+}
-+
-+static void update_bus_bw(struct mu3h_sch_bw_info *sch_bw,
-+ struct mu3h_sch_ep_info *sch_ep, int bw_cost)
-+{
-+ u32 num_esit;
-+ u32 base;
-+ int i;
-+ int j;
-+
-+ num_esit = XHCI_MTK_MAX_ESIT / sch_ep->esit;
-+ for (i = 0; i < 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[base + j] += bw_cost;
-+ }
-+
-+}
-+
-+static void debug_sch_ep(struct mu3h_sch_ep_info *sch_ep)
-+{
-+ pr_debug("sch_ep->ep_type = %d\n", sch_ep->ep_type);
-+ pr_debug("sch_ep->max_packet_size = %d\n", sch_ep->max_packet_size);
-+ pr_debug("sch_ep->esit = %d\n", sch_ep->esit);
-+ pr_debug("sch_ep->num_budget_microframes = %d\n",
-+ sch_ep->num_budget_microframes);
-+ pr_debug("sch_ep->bw_cost_per_microframe = %d\n",
-+ sch_ep->bw_cost_per_microframe);
-+ pr_debug("sch_ep->ep = %p\n", sch_ep->ep);
-+ pr_debug("sch_ep->offset = %d\n", sch_ep->offset);
-+ pr_debug("sch_ep->repeat = %d\n", sch_ep->repeat);
-+ pr_debug("sch_ep->pkts = %d\n", sch_ep->pkts);
-+ pr_debug("sch_ep->cs_count = %d\n", sch_ep->cs_count);
-+}
-+
-+static int check_sch_bw(struct usb_device *udev,
-+ struct mu3h_sch_bw_info *sch_bw, struct mu3h_sch_ep_info *sch_ep)
-+{
-+ u32 offset;
-+ u32 esit;
-+ u32 num_budget_microframes;
-+ u32 min_bw;
-+ u32 min_index;
-+ u32 worst_bw;
-+ u32 bw_boundary;
-+
-+ if (sch_ep->esit > XHCI_MTK_MAX_ESIT)
-+ sch_ep->esit = XHCI_MTK_MAX_ESIT;
-+
-+ esit = sch_ep->esit;
-+ num_budget_microframes = sch_ep->num_budget_microframes;
-+
-+ /*
-+ * Search through all possible schedule microframes.
-+ * and find a microframe where its worst bandwidth is minimum.
-+ */
-+ min_bw = ~0;
-+ min_index = 0;
-+ for (offset = 0; offset < esit; offset++) {
-+ if ((offset + num_budget_microframes) > sch_ep->esit)
-+ break;
-+ /*
-+ * usb_20 spec section11.18:
-+ * must never schedule Start-Split in Y6
-+ */
-+ if (is_fs_or_ls(udev->speed) && (offset % 8 == 6))
-+ continue;
-+
-+ worst_bw = get_max_bw(sch_bw, sch_ep, offset);
-+ if (min_bw > worst_bw) {
-+ min_bw = worst_bw;
-+ min_index = offset;
-+ }
-+ if (min_bw == 0)
-+ break;
-+ }
-+ sch_ep->offset = min_index;
-+
-+ debug_sch_ep(sch_ep);
-+
-+ bw_boundary = (udev->speed == USB_SPEED_SUPER)
-+ ? SS_BW_BOUNDARY : HS_BW_BOUNDARY;
-+
-+ /* check bandwidth */
-+ if (min_bw + sch_ep->bw_cost_per_microframe > bw_boundary)
-+ return -1;
-+
-+ /* update bus bandwidth info */
-+ update_bus_bw(sch_bw, sch_ep, sch_ep->bw_cost_per_microframe);
-+
-+ return 0;
-+}
-+
-+static void debug_sch_bw(struct mu3h_sch_bw_info *sch_bw)
-+{
-+ int i;
-+
-+ pr_debug("xhci_mtk_scheduler :bus_bw_info\n");
-+ for (i = 0; i < XHCI_MTK_MAX_ESIT; i++)
-+ pr_debug("%d ", sch_bw->bus_bw[i]);
-+
-+ pr_debug("\n");
-+}
-+
-+
-+static int need_bw_sch(struct usb_host_endpoint *ep,
-+ enum usb_device_speed speed, int has_tt)
-+{
-+ /* only for synchronous endpoints */
-+ if (usb_endpoint_xfer_control(&ep->desc)
-+ || usb_endpoint_xfer_bulk(&ep->desc))
-+ return 0;
-+ /*
-+ * for LS & FS synchronous endpoints which its device don't attach
-+ * to TT are also ignored, root-hub will schedule them directly
-+ */
-+ if (is_fs_or_ls(speed) && !has_tt)
-+ return 0;
-+
-+ return 1;
-+}
-+
-+int xhci_mtk_init_quirk(struct xhci_hcd *xhci)
-+{
-+ struct usb_hcd *hcd = xhci_to_hcd(xhci);
-+ struct device *dev = hcd->self.controller;
-+ struct mu3h_sch_bw_info *sch_array;
-+ size_t array_size;
-+ int num_usb_bus;
-+ int i;
-+
-+ /* ss IN and OUT are separated */
-+ num_usb_bus = xhci->num_usb3_ports * 2 + xhci->num_usb2_ports;
-+ array_size = sizeof(*sch_array) * num_usb_bus;
-+
-+ sch_array = kzalloc(array_size, GFP_KERNEL);
-+ if (sch_array == NULL)
-+ return -ENOMEM;
-+
-+ for (i = 0; i < num_usb_bus; i++)
-+ INIT_LIST_HEAD(&sch_array[i].bw_ep_list);
-+
-+ dev->platform_data = sch_array;
-+ xhci->quirks |= XHCI_MTK_HOST;
-+ /*
-+ * MTK host controller gives a spurious successful event after a
-+ * short transfer. Ignore it.
-+ */
-+ xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
-+
-+ return 0;
-+}
-+
-+
-+void xhci_mtk_exit_quirk(struct xhci_hcd *xhci)
-+{
-+ struct usb_hcd *hcd = xhci_to_hcd(xhci);
-+ struct mu3h_sch_bw_info *sch_array;
-+
-+ sch_array = dev_get_platdata(hcd->self.controller);
-+ kfree(sch_array);
-+}
-+
-+
-+int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
-+ struct usb_host_endpoint *ep)
-+{
-+ int ret = 0;
-+ int port_id;
-+ int bw_index;
-+ struct xhci_hcd *xhci;
-+ unsigned int ep_index;
-+ struct xhci_ep_ctx *ep_ctx;
-+ struct xhci_slot_ctx *slot_ctx;
-+ struct xhci_virt_device *virt_dev;
-+ struct mu3h_sch_bw_info *sch_bw;
-+ struct mu3h_sch_ep_info *sch_ep;
-+ struct mu3h_sch_bw_info *sch_array;
-+
-+ xhci = hcd_to_xhci(hcd);
-+ virt_dev = xhci->devs[udev->slot_id];
-+ ep_index = xhci_get_endpoint_index(&ep->desc);
-+ slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
-+ ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
-+ sch_array = dev_get_platdata(hcd->self.controller);
-+
-+ port_id = virt_dev->real_port;
-+ xhci_dbg(xhci, "%s() xfer_type: %d, speed:%d, ep:%p\n", __func__,
-+ usb_endpoint_type(&ep->desc), udev->speed, ep);
-+
-+ if (!need_bw_sch(ep, udev->speed, slot_ctx->tt_info & TT_SLOT))
-+ return 0;
-+
-+ bw_index = get_bw_index(xhci, udev, ep);
-+ sch_bw = &sch_array[bw_index];
-+
-+ sch_ep = kzalloc(sizeof(struct mu3h_sch_ep_info), GFP_KERNEL);
-+ if (!sch_ep)
-+ return -ENOMEM;
-+
-+ setup_sch_info(udev, ep_ctx, sch_ep);
-+
-+ ret = check_sch_bw(udev, sch_bw, sch_ep);
-+ if (ret) {
-+ xhci_err(xhci, "Not enough bandwidth!\n");
-+ kfree(sch_ep);
-+ return -ENOSPC;
-+ }
-+
-+ list_add_tail(&sch_ep->endpoint, &sch_bw->bw_ep_list);
-+ sch_ep->ep = ep;
-+
-+ 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));
-+
-+ debug_sch_bw(sch_bw);
-+ return 0;
-+}
-+
-+void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
-+ struct usb_host_endpoint *ep)
-+{
-+ int bw_index;
-+ struct xhci_hcd *xhci;
-+ struct xhci_slot_ctx *slot_ctx;
-+ struct xhci_virt_device *virt_dev;
-+ struct mu3h_sch_bw_info *sch_array;
-+ struct mu3h_sch_bw_info *sch_bw;
-+ struct mu3h_sch_ep_info *sch_ep;
-+
-+ xhci = hcd_to_xhci(hcd);
-+ virt_dev = xhci->devs[udev->slot_id];
-+ slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
-+ sch_array = dev_get_platdata(hcd->self.controller);
-+
-+ xhci_dbg(xhci, "%s() xfer_type: %d, speed:%d, ep:%p\n", __func__,
-+ usb_endpoint_type(&ep->desc), udev->speed, ep);
-+
-+ if (!need_bw_sch(ep, udev->speed, slot_ctx->tt_info & TT_SLOT))
-+ return;
-+
-+ bw_index = get_bw_index(xhci, udev, ep);
-+ sch_bw = &sch_array[bw_index];
-+
-+ list_for_each_entry(sch_ep, &sch_bw->bw_ep_list, endpoint) {
-+ if (sch_ep->ep == ep) {
-+ update_bus_bw(sch_bw, sch_ep,
-+ -sch_ep->bw_cost_per_microframe);
-+ list_del(&sch_ep->endpoint);
-+ kfree(sch_ep);
-+ break;
-+ }
-+ }
-+ debug_sch_bw(sch_bw);
-+}
-+
-+
-+/*
-+ * The TD size is the number of bytes remaining in the TD (including this TRB),
-+ * right shifted by 10.
-+ * It must fit in bits 21:17, so it can't be bigger than 31.
-+ */
-+u32 xhci_mtk_td_remainder_quirk(unsigned int td_running_total,
-+ unsigned trb_buffer_length, struct urb *urb)
-+{
-+ u32 max = 31;
-+ int remainder, td_packet_count, packet_transferred;
-+ unsigned int td_transfer_size = urb->transfer_buffer_length;
-+ unsigned int maxp;
-+
-+ maxp = GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc));
-+
-+ /* 0 for the last TRB */
-+ if (td_running_total + trb_buffer_length == td_transfer_size)
-+ return 0;
-+
-+ packet_transferred = td_running_total / maxp;
-+ td_packet_count = DIV_ROUND_UP(td_transfer_size, maxp);
-+ remainder = td_packet_count - packet_transferred;
-+
-+ if (remainder > max)
-+ return max << 17;
-+ else
-+ return remainder << 17;
-+}
-+
-+
---- /dev/null
-+++ b/drivers/usb/host/xhci-mtk.h
-@@ -0,0 +1,119 @@
-+/*
-+ * Copyright (c) 2015 MediaTek Inc.
-+ * Author:
-+ * Zhigang.Wun <zhigang.wei@mediatek.com>
-+ * Chunfeng.Yun <chunfeng.yun@mediatek.com>
-+ *
-+ * This software is licensed under the terms of the GNU General Public
-+ * License version 2, as published by the Free Software Foundation, and
-+ * may be copied, distributed, and modified under those terms.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ *
-+ */
-+
-+#ifndef _XHCI_MTK_H_
-+#define _XHCI_MTK_H_
-+
-+#include "xhci.h"
-+
-+/**
-+ * To simplify scheduler algorithm, set a upper limit for ESIT,
-+ * if a synchromous ep's ESIT is larger than @XHCI_MTK_MAX_ESIT,
-+ * round down to the limit value, that means allocating more
-+ * bandwidth to it.
-+ */
-+#define XHCI_MTK_MAX_ESIT 64
-+
-+/**
-+ * struct mu3h_sch_bw_info
-+ * @bus_bw: array to keep track of bandwidth already used at each uframes
-+ * @bw_ep_list: eps in the bandwidth domain
-+ *
-+ * treat a HS root port as a bandwidth domain, but treat a SS root port as
-+ * two bandwidth domains, one for IN eps and another for OUT eps.
-+ */
-+struct mu3h_sch_bw_info {
-+ u32 bus_bw[XHCI_MTK_MAX_ESIT];
-+ struct list_head bw_ep_list;
-+};
-+
-+/**
-+ * struct mu3h_sch_ep_info
-+ * @esit: unit is 125us, equal to 2 << Interval field in ep-context
-+ * @num_budget_microframes: number of continuous uframes
-+ * (@repeat==1) scheduled within the interval
-+ * @ep: address of usb_host_endpoint
-+ * @offset: which uframe of the interval that transfer should be
-+ * scheduled first time within the interval
-+ * @repeat: the time gap between two uframes that transfers are
-+ * scheduled within a interval. in the simple algorithm, only
-+ * assign 0 or 1 to it; 0 means using only one uframe in a
-+ * interval, and1 means using @num_budget_microframes
-+ * continuous uframes
-+ * @pkts: number of packets to be transferred in the scheduled uframes
-+ * @cs_count: number of CS that host will trigger
-+ */
-+struct mu3h_sch_ep_info {
-+ u32 ep_type;
-+ u32 max_packet_size;
-+ u32 esit;
-+ u32 num_budget_microframes;
-+ u32 bw_cost_per_microframe;
-+ void *ep;
-+ struct list_head endpoint;
-+
-+ /* mtk xhci scheduling info */
-+ u32 offset;
-+ u32 repeat;
-+ u32 pkts;
-+ u32 cs_count;
-+ u32 burst_mode;
-+};
-+
-+
-+#if IS_ENABLED(CONFIG_USB_XHCI_MTK)
-+
-+int xhci_mtk_init_quirk(struct xhci_hcd *xhci);
-+void xhci_mtk_exit_quirk(struct xhci_hcd *xhci);
-+int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
-+ struct usb_host_endpoint *ep);
-+void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
-+ struct usb_host_endpoint *ep);
-+u32 xhci_mtk_td_remainder_quirk(unsigned int td_running_total,
-+ unsigned trb_buffer_length, struct urb *urb);
-+
-+#else
-+static inline int xhci_mtk_init_quirk(struct xhci_hcd *xhci)
-+{
-+ return 0;
-+}
-+
-+static inline void xhci_mtk_exit_quirk(struct xhci_hcd *xhci)
-+{
-+}
-+
-+static inline int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd,
-+ struct usb_device *udev, struct usb_host_endpoint *ep)
-+{
-+ return 0;
-+}
-+
-+static inline void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd,
-+ struct usb_device *udev, struct usb_host_endpoint *ep)
-+{
-+ return 0;
-+}
-+
-+static inline u32 xhci_mtk_td_remainder_quirk(unsigned int td_running_total,
-+ unsigned trb_buffer_length, struct urb *urb)
-+{
-+ return 0;
-+}
-+
-+#endif
-+
-+#endif /* _XHCI_MTK_H_ */
---- a/drivers/usb/host/xhci-plat.c
-+++ b/drivers/usb/host/xhci-plat.c
-@@ -23,6 +23,7 @@
- #include "xhci.h"
- #include "xhci-mvebu.h"
- #include "xhci-rcar.h"
-+#include "xhci-mtk.h"
-
- static struct hc_driver __read_mostly xhci_plat_hc_driver;
-
-@@ -49,7 +50,23 @@ static int xhci_plat_setup(struct usb_hc
- return ret;
- }
-
-- return xhci_gen_setup(hcd, xhci_plat_quirks);
-+ ret = xhci_gen_setup(hcd, xhci_plat_quirks);
-+ if (ret)
-+ return ret;
-+
-+ if (of_device_is_compatible(of_node, "mediatek,mt8173-xhci")) {
-+ struct xhci_hcd *xhci = hcd_to_xhci(hcd);
-+
-+ if (!usb_hcd_is_primary_hcd(hcd))
-+ return 0;
-+ ret = xhci_mtk_init_quirk(xhci);
-+ if (ret) {
-+ kfree(xhci);
-+ return ret;
-+ }
-+ }
-+
-+ return ret;
- }
-
- static int xhci_plat_start(struct usb_hcd *hcd)
-@@ -207,6 +224,8 @@ static int xhci_plat_remove(struct platf
- if (!IS_ERR(clk))
- clk_disable_unprepare(clk);
- usb_put_hcd(hcd);
-+ if (xhci->quirks & XHCI_MTK_HOST)
-+ xhci_mtk_exit_quirk(xhci);
- kfree(xhci);
-
- return 0;
-@@ -253,6 +272,7 @@ static const struct of_device_id usb_xhc
- { .compatible = "marvell,armada-380-xhci"},
- { .compatible = "renesas,xhci-r8a7790"},
- { .compatible = "renesas,xhci-r8a7791"},
-+ { .compatible = "mediatek,mt8173-xhci"},
- { },
- };
- MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
---- a/drivers/usb/host/xhci-ring.c
-+++ b/drivers/usb/host/xhci-ring.c
-@@ -68,6 +68,7 @@
- #include <linux/slab.h>
- #include "xhci.h"
- #include "xhci-trace.h"
-+#include "xhci-mtk.h"
-
- /*
- * Returns zero if the TRB isn't in this segment, otherwise it returns the DMA
-@@ -3026,17 +3027,22 @@ static u32 xhci_td_remainder(struct xhci
- {
- u32 maxp, total_packet_count;
-
-- if (xhci->hci_version < 0x100)
-+ /* MTK xHCI is mostly 0.97 but contains some features from 1.0 */
-+ if (xhci->hci_version < 0x100 && !(xhci->quirks & XHCI_MTK_HOST))
- return ((td_total_len - transferred) >> 10);
-
-- maxp = GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc));
-- total_packet_count = DIV_ROUND_UP(td_total_len, maxp);
--
- /* One TRB with a zero-length data packet. */
- if (num_trbs_left == 0 || (transferred == 0 && trb_buff_len == 0) ||
- trb_buff_len == td_total_len)
- return 0;
-
-+ /* for MTK xHCI, TD size doesn't include this TRB */
-+ if (xhci->quirks & XHCI_MTK_HOST)
-+ trb_buff_len = 0;
-+
-+ maxp = GET_MAX_PACKET(usb_endpoint_maxp(&urb->ep->desc));
-+ total_packet_count = DIV_ROUND_UP(td_total_len, maxp);
-+
- /* Queueing functions don't count the current TRB into transferred */
- return (total_packet_count - ((transferred + trb_buff_len) / maxp));
- }
-@@ -3424,7 +3430,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *
- field |= 0x1;
-
- /* xHCI 1.0/1.1 6.4.1.2.1: Transfer Type field */
-- if (xhci->hci_version >= 0x100) {
-+ if ((xhci->hci_version >= 0x100) || (xhci->quirks & XHCI_MTK_HOST)) {
- if (urb->transfer_buffer_length > 0) {
- if (setup->bRequestType & USB_DIR_IN)
- field |= TRB_TX_TYPE(TRB_DATA_IN);
---- a/drivers/usb/host/xhci.c
-+++ b/drivers/usb/host/xhci.c
-@@ -31,6 +31,7 @@
-
- #include "xhci.h"
- #include "xhci-trace.h"
-+#include "xhci-mtk.h"
-
- #define DRIVER_AUTHOR "Sarah Sharp"
- #define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
-@@ -634,7 +635,11 @@ int xhci_run(struct usb_hcd *hcd)
- "// Set the interrupt modulation register");
- temp = readl(&xhci->ir_set->irq_control);
- temp &= ~ER_IRQ_INTERVAL_MASK;
-- temp |= (u32) 160;
-+ /*
-+ * the increment interval is 8 times as much as that defined
-+ * in xHCI spec on MTK's controller
-+ */
-+ temp |= (u32) ((xhci->quirks & XHCI_MTK_HOST) ? 20 : 160);
- writel(temp, &xhci->ir_set->irq_control);
-
- /* Set the HCD state before we enable the irqs */
-@@ -1710,6 +1715,9 @@ int xhci_drop_endpoint(struct usb_hcd *h
-
- xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
-
-+ if (xhci->quirks & XHCI_MTK_HOST)
-+ xhci_mtk_drop_ep_quirk(hcd, udev, ep);
-+
- xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x\n",
- (unsigned int) ep->desc.bEndpointAddress,
- udev->slot_id,
-@@ -1805,6 +1813,12 @@ int xhci_add_endpoint(struct usb_hcd *hc
- return -ENOMEM;
- }
-
-+ if (xhci->quirks & XHCI_MTK_HOST) {
-+ ret = xhci_mtk_add_ep_quirk(hcd, udev, ep);
-+ if (ret < 0)
-+ return ret;
-+ }
-+
- ctrl_ctx->add_flags |= cpu_to_le32(added_ctxs);
- new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
-
---- a/drivers/usb/host/xhci.h
-+++ b/drivers/usb/host/xhci.h
-@@ -1570,6 +1570,7 @@ struct xhci_hcd {
- /* For controllers with a broken beyond repair streams implementation */
- #define XHCI_BROKEN_STREAMS (1 << 19)
- #define XHCI_PME_STUCK_QUIRK (1 << 20)
-+#define XHCI_MTK_HOST (1 << 21)
- #define XHCI_SSIC_PORT_UNUSED (1 << 22)
- unsigned int num_active_eps;
- unsigned int limit_active_eps;
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