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Message-ID: <1441110570.26285.33.camel@mhfsdcap03>
Date: Tue, 1 Sep 2015 20:29:30 +0800
From: chunfeng yun <chunfeng.yun@...iatek.com>
To: Daniel Thompson <daniel.thompson@...aro.org>
CC: Mathias Nyman <mathias.nyman@...el.com>,
Mark Rutland <mark.rutland@....com>,
<devicetree@...r.kernel.org>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
<linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
Felipe Balbi <balbi@...com>,
"Kishon Vijay Abraham I" <kishon@...com>,
Rob Herring <robh+dt@...nel.org>,
<linux-mediatek@...ts.infradead.org>,
Matthias Brugger <matthias.bgg@...il.com>,
John Crispin <blogic@...nwrt.org>,
<linux-arm-kernel@...ts.infradead.org>,
Roger Quadros <rogerq@...com>
Subject: Re: [PATCH v6 4/5] xhci: mediatek: support MTK xHCI host controller
On Wed, 2015-08-26 at 22:18 +0100, Daniel Thompson wrote:
> On 22/08/15 02:45, Chunfeng Yun wrote:
> > 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
>
> According to the covering e-mail there are additional quirks beyond the
> scheduling algorithm. These should probably be mentioned here also (so
> that they end up in the changelog).
>
Ok, I will add them.
>
> >
> > Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
> > ---
> > drivers/usb/host/Kconfig | 9 +
> > drivers/usb/host/Makefile | 4 +
> > drivers/usb/host/xhci-mtk-sch.c | 436 +++++++++++++++++++++
> > drivers/usb/host/xhci-mtk.c | 831 ++++++++++++++++++++++++++++++++++++++++
> > drivers/usb/host/xhci-mtk.h | 133 +++++++
> > drivers/usb/host/xhci-ring.c | 35 +-
> > drivers/usb/host/xhci.c | 19 +-
> > drivers/usb/host/xhci.h | 1 +
> > 8 files changed, 1461 insertions(+), 7 deletions(-)
> > create mode 100644 drivers/usb/host/xhci-mtk-sch.c
> > create mode 100644 drivers/usb/host/xhci-mtk.c
> > create mode 100644 drivers/usb/host/xhci-mtk.h
> >
> > [snip]
> >
> > diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c
> > new file mode 100644
> > index 0000000..d4b41a6
> > --- /dev/null
> > +++ b/drivers/usb/host/xhci-mtk-sch.c
> > @@ -0,0 +1,436 @@
> > +/*
> > + * Copyright (c) 2015 MediaTek Inc.
> > + * Author:
> > + * Zhigang.Wei <zhigang.wei@...iatek.com>
> > + * Chunfeng.Yun <chunfeng.yun@...iatek.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/module.h>
> > +#include <linux/slab.h>
> > +
> > +#include "xhci.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;
> > +}
>
> This function is only used three times (and one of the uses would have
> been a switch statement except for needing to make this function call).
> Does it really make code clearer?
>
This is mainly used to remove warnings when check patch by checkpatch.pl
>
> > +
> > +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;
> > +}
>
> This appears to be a function to help the scheduling code lookup
> per-port private data held as an array in the device private structure.
>
> Is this really the best way to lookup this data? (and if it *is* we
> still need some comments explaining what this function does and how it
> relates to sch_array).
>
Yes, I will add some description for it.
>
> > +
> > +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));
> > +
> > + 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
>
> Some nitpicks: s/busrt/burst/ and add whitespace around the comments
> (there lots of "missing" vertical whitespace in this file).
>
Oh, a clerical mistake, revise it later
>
> > + */
> > + 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);
>
> This function appears to arbitrarily switch from reading from
> max_packet_size to reading from sch_ep->max_packet_size .
>
Yes, it's better to use only local variable of max_packet_size.
>
> > + 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 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;
> > +
> > + 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;
>
> Couldn't this be -errno?
>
I will replace it by ERANGE.
>
> > +
> > + /* update bus bandwidth info */
> > + update_bus_bw(sch_bw, sch_ep, sch_ep->bw_cost_per_microframe);
> > +
> > + return 0;
> > +}
> > +
> > +static bool need_bw_sch(struct usb_host_endpoint *ep,
> > + enum usb_device_speed speed, int has_tt)
> > +{
> > + /* 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 don't attach
> > + * to TT are also ignored, root-hub will schedule them directly
> > + */
> > + if (is_fs_or_ls(speed) && !has_tt)
> > + return false;
> > +
> > + return true;
> > +}
> > +
> > +int xhci_mtk_sch_init(struct xhci_hcd *xhci)
> > +{
> > + struct usb_hcd *hcd = xhci_to_hcd(xhci);
> > + struct device *dev = hcd->self.controller;
> > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
> > + struct mu3h_sch_bw_info *sch_array;
> > + int num_usb_bus;
> > + int i;
> > +
> > + /* ss IN and OUT are separated */
> > + num_usb_bus = xhci->num_usb3_ports * 2 + xhci->num_usb2_ports;
> > +
> > + sch_array = kcalloc(num_usb_bus, sizeof(*sch_array), 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);
> > +
> > + mtk->sch_array = sch_array;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(xhci_mtk_sch_init);
> > +
> > +void xhci_mtk_sch_exit(struct xhci_hcd *xhci)
> > +{
> > + struct usb_hcd *hcd = xhci_to_hcd(xhci);
> > + struct device *dev = hcd->self.controller;
> > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
> > +
> > + kfree(mtk->sch_array);
> > +}
> > +EXPORT_SYMBOL_GPL(xhci_mtk_sch_exit);
> > +
> > +int xhci_mtk_add_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
> > + struct usb_host_endpoint *ep)
> > +{
> > + struct device *dev = hcd->self.controller;
> > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
> > +
> > + 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 = mtk->sch_array;
> > +
> > + 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_NOIO);
> > + 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));
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(xhci_mtk_add_ep_quirk);
> > +
> > +void xhci_mtk_drop_ep_quirk(struct usb_hcd *hcd, struct usb_device *udev,
> > + struct usb_host_endpoint *ep)
> > +{
> > + struct device *dev = hcd->self.controller;
> > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
> > +
> > + 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 = mtk->sch_array;
> > +
> > + xhci_dbg(xhci, "%s() xfer_type: %d, speed:%d, ep:%p\n", __func__,
> > + sb_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;
> > + }
> > + }
> > +}
> > +EXPORT_SYMBOL_GPL(xhci_mtk_drop_ep_quirk);
> > +
> > +/*
> > + * The TD size is the number of max packet sized packets 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;
> > +}
> > +EXPORT_SYMBOL_GPL(xhci_mtk_td_remainder_quirk);
> > diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
> > new file mode 100644
> > index 0000000..89c1417
> > --- /dev/null
> > +++ b/drivers/usb/host/xhci-mtk.c
> > @@ -0,0 +1,831 @@
> > +/*
> > + * Copyright (c) 2015 MediaTek Inc.
> > + * Author:
> > + * Chunfeng Yun <chunfeng.yun@...iatek.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/clk.h>
> > +#include <linux/dma-mapping.h>
> > +#include <linux/iopoll.h>
> > +#include <linux/kernel.h>
> > +#include <linux/mfd/syscon.h>
> > +#include <linux/module.h>
> > +#include <linux/of.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/pm_runtime.h>
> > +#include <linux/regmap.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/slab.h>
> > +#include <linux/usb/phy.h>
> > +#include <linux/usb/xhci_pdriver.h>
> > +
> > +#include "xhci.h"
> > +#include "xhci-mtk.h"
> > +
> > +#define SSUSB_USB3_MAC_CSR_BASE (0x2400)
> > +#define SSUSB_USB3_SYS_CSR_BASE (0x2400)
> > +#define SSUSB_USB2_CSR_BASE (0x3400)
>
> Can we lose the braces?
>
Yes.
>
> > +
> > +#define SSUSB_SIFSLV_IPPC_BASE (0x700)
> > +
> > +#define U3P_UX_EXIT_LFPS_PARAM (SSUSB_USB3_MAC_CSR_BASE + 0x00A0)
> > +#define RX_UX_EXIT_REF (0xff << 8)
>
> There's a macro to generate bit masks: GENMASK(15, 8)
>
> Please apply this comment further down the file too...
>
Ok, I will do it.
>
> > +#define RX_UX_EXIT_REF_VAL (0x3 << 8)
> > +
> > +#define U3P_REF_CLK_PARAM (SSUSB_USB3_MAC_CSR_BASE + 0x00B0)
> > +#define REF_CLK_1000NS (0xff << 0)
> > +#define REF_CLK_VAL_DEF (0xa << 0)
> > +
> > +#define U3P_LINK_PM_TIMER (SSUSB_USB3_SYS_CSR_BASE + 0x0208)
> > +#define PM_LC_TIMEOUT (0xf << 0)
> > +#define PM_LC_TIMEOUT_VAL (0x3 << 0)
> > +
> > +#define U3P_TIMING_PULSE_CTRL (SSUSB_USB3_SYS_CSR_BASE + 0x02B4)
> > +#define U3T_CNT_1US (0xff << 0)
> > +#define U3T_CNT_1US_VAL (0x3f << 0) /* 62.5MHz: 63 */
> > +
> > +#define U3P_U2_TIMING_PARAM (SSUSB_USB2_CSR_BASE + 0x0040)
> > +#define U2T_VAL_1US (0xff << 0)
> > +#define U2T_VAL_1US_VAL (0x3f << 0) /* 62.5MHz: 63 */
> > +
> > +#define U3P_IP_PW_CTRL0 (SSUSB_SIFSLV_IPPC_BASE + 0x0000)
> > +#define CTRL0_IP_SW_RST BIT(0)
> > +
> > +#define U3P_IP_PW_CTRL1 (SSUSB_SIFSLV_IPPC_BASE + 0x0004)
> > +#define CTRL1_IP_HOST_PDN BIT(0)
> > +
> > +#define U3P_IP_PW_CTRL2 (SSUSB_SIFSLV_IPPC_BASE + 0x0008)
> > +#define CTRL2_IP_DEV_PDN BIT(0)
> > +
> > +#define U3P_IP_PW_STS1 (SSUSB_SIFSLV_IPPC_BASE + 0x0010)
> > +#define STS1_IP_SLEEP_STS BIT(30)
> > +#define STS1_U3_MAC_RST BIT(16)
> > +#define STS1_SYS125_RST BIT(10)
> > +#define STS1_REF_RST BIT(8)
> > +#define STS1_SYSPLL_STABLE BIT(0)
> > +
> > +#define U3P_IP_PW_STS2 (SSUSB_SIFSLV_IPPC_BASE + 0x0014)
> > +#define STS2_U2_MAC_RST BIT(0)
> > +
> > +#define U3P_IP_XHCI_CAP (SSUSB_SIFSLV_IPPC_BASE + 0x0024)
> > +#define CAP_U3_PORT_NUM(p) ((p) & 0xff)
> > +#define CAP_U2_PORT_NUM(p) (((p) >> 8) & 0xff)
> > +
> > +#define U3P_U3_CTRL_0P (SSUSB_SIFSLV_IPPC_BASE + 0x0030)
> > +#define CTRL_U3_PORT_HOST_SEL BIT(2)
> > +#define CTRL_U3_PORT_PDN BIT(1)
> > +#define CTRL_U3_PORT_DIS BIT(0)
> > +
> > +#define U3P_U2_CTRL_0P (SSUSB_SIFSLV_IPPC_BASE + 0x0050)
> > +#define CTRL_U2_PORT_HOST_SEL BIT(2)
> > +#define CTRL_U2_PORT_PDN BIT(1)
> > +#define CTRL_U2_PORT_DIS BIT(0)
> > +
> > +#define U3P_U2_PHY_PLL (SSUSB_SIFSLV_IPPC_BASE+0x007c)
> > +#define CTRL_U2_FORCE_PLL_STB (0x1<<28)
> > +
> > +#define U3P_U3_CTRL(p) (U3P_U3_CTRL_0P + ((p) * 0x08))
> > +#define U3P_U2_CTRL(p) (U3P_U2_CTRL_0P + ((p) * 0x08))
> > +
> > +#define PERI_WK_CTRL0 0x400
> > +#define UWK_CTR0_0P_LS_PE BIT(8) /* posedge */
> > +#define UWK_CTR0_0P_LS_NE BIT(7) /* negedge for 0p linestate*/
> > +#define UWK_CTL1_1P_LS_C(x) (((x) & 0xf) << 1)
> > +#define UWK_CTL1_1P_LS_E BIT(0)
> > +
> > +#define PERI_WK_CTRL1 0x404
> > +#define UWK_CTL1_IS_C(x) (((x) & 0xf) << 26)
> > +#define UWK_CTL1_IS_E BIT(25)
> > +#define UWK_CTL1_0P_LS_C(x) (((x) & 0xf) << 21)
> > +#define UWK_CTL1_0P_LS_E BIT(20)
> > +#define UWK_CTL1_IDDIG_C(x) (((x) & 0xf) << 11) /* cycle debounce */
> > +#define UWK_CTL1_IDDIG_E BIT(10) /* enable debounce */
> > +#define UWK_CTL1_IDDIG_P BIT(9) /* polarity */
> > +#define UWK_CTL1_0P_LS_P BIT(7)
> > +#define UWK_CTL1_IS_P BIT(6) /* polarity for ip sleep */
> > +
> > +enum ssusb_wakeup_src {
> > + SSUSB_WK_IP_SLEEP = 1,
> > + SSUSB_WK_LINE_STATE = 2,
> > +};
> > +
> > +static int check_ip_clk_status(struct xhci_hcd_mtk *mtk)
> > +{
> > + int ret;
> > + int u3_port_num;
> > + int u2_port_num;
> > + u32 xhci_cap;
> > + u32 val;
> > + void __iomem *ippc_base = mtk->ippc_base;
> > +
> > + xhci_cap = readl(ippc_base + U3P_IP_XHCI_CAP);
> > + u3_port_num = CAP_U3_PORT_NUM(xhci_cap);
> > + u2_port_num = CAP_U2_PORT_NUM(xhci_cap);
> > +
> > + ret = readl_poll_timeout(ippc_base + U3P_IP_PW_STS1, val,
> > + (val & STS1_SYSPLL_STABLE), 100, 10000);
> > + if (ret) {
> > + dev_err(mtk->dev, "syspll is not stable!!!\n");
> > + return ret;
> > + }
> > +
> > + ret = readl_poll_timeout(ippc_base + U3P_IP_PW_STS1, val,
> > + (val & STS1_REF_RST), 100, 10000);
> > + if (ret) {
> > + dev_err(mtk->dev, "ref_clk is still active!!!\n");
>
> Just curious...
>
> Why do we need to check the clocks are inactive after enabling the ports?
>
> [I guess this means I'd like a comment explaining why this function is
> needed].
>
I will add some comments later.
> > + return ret;
> > + }
> > +
> > + ret = readl_poll_timeout(ippc_base + U3P_IP_PW_STS1, val,
> > + (val & STS1_SYS125_RST), 100, 10000);
> > + if (ret) {
> > + dev_err(mtk->dev, "sys125_ck is still active!!!\n");
> > + return ret;
> > + }
> > +
> > + if (u3_port_num) {
> > + ret = readl_poll_timeout(ippc_base + U3P_IP_PW_STS1, val,
> > + (val & STS1_U3_MAC_RST), 100, 10000);
> > + if (ret) {
> > + dev_err(mtk->dev, "mac3_mac_ck is still active!!!\n");
> > + return ret;
> > + }
> > + }
> > +
> > + if (u2_port_num) {
> > + ret = readl_poll_timeout(ippc_base + U3P_IP_PW_STS2, val,
> > + (val & STS2_U2_MAC_RST), 100, 10000);
> > + if (ret) {
> > + dev_err(mtk->dev, "mac2_sys_ck is still active!!!\n");
> > + return ret;
> > + }
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static int xhci_mtk_ports_enable(struct xhci_hcd_mtk *mtk)
> > +{
> > + int i;
> > + u32 temp;
> > + int u3_port_num;
> > + int u2_port_num;
> > + void __iomem *ippc_base = mtk->ippc_base;
> > +
> > + temp = readl(ippc_base + U3P_IP_XHCI_CAP);
> > + u3_port_num = CAP_U3_PORT_NUM(temp);
> > + u2_port_num = CAP_U2_PORT_NUM(temp);
> > + dev_dbg(mtk->dev, "%s u2p:%d, u3p:%d\n", __func__,
> > + u2_port_num, u3_port_num);
> > +
> > + /* power on host ip */
> > + temp = readl(ippc_base + U3P_IP_PW_CTRL1);
> > + temp &= ~CTRL1_IP_HOST_PDN;
> > + writel(temp, ippc_base + U3P_IP_PW_CTRL1);
> > +
> > + /* power on and enable all u3 ports */
> > + for (i = 0; i < u3_port_num; i++) {
> > + temp = readl(ippc_base + U3P_U3_CTRL(i));
> > + temp &= ~(CTRL_U3_PORT_PDN | CTRL_U3_PORT_DIS);
> > + temp |= CTRL_U3_PORT_HOST_SEL;
> > + writel(temp, ippc_base + U3P_U3_CTRL(i));
> > + }
> > +
> > + /* power on and enable all u2 ports */
> > + for (i = 0; i < u2_port_num; i++) {
> > + temp = readl(ippc_base + U3P_U2_CTRL(i));
> > + temp &= ~(CTRL_U2_PORT_PDN | CTRL_U2_PORT_DIS);
> > + temp |= CTRL_U2_PORT_HOST_SEL;
> > + writel(temp, ippc_base + U3P_U2_CTRL(i));
> > + }
> > + return check_ip_clk_status(mtk);
> > +}
> > +
> > +static int xhci_mtk_ports_disable(struct xhci_hcd_mtk *mtk)
> > +{
> > + int i;
> > + u32 temp;
> > + int ret;
> > + int u3_port_num;
> > + int u2_port_num;
> > + void __iomem *ippc_base = mtk->ippc_base;
> > +
> > + temp = readl(ippc_base + U3P_IP_XHCI_CAP);
> > + u3_port_num = CAP_U3_PORT_NUM(temp);
> > + u2_port_num = CAP_U2_PORT_NUM(temp);
> > + dev_dbg(mtk->dev, "%s u2p:%d, u3p:%d\n", __func__,
> > + u2_port_num, u3_port_num);
> > +
> > + /* disable all u3 ports */
> > + for (i = 0; i < u3_port_num; i++) {
> > + temp = readl(ippc_base + U3P_U3_CTRL(i));
> > + temp |= CTRL_U3_PORT_PDN;
> > + writel(temp, ippc_base + U3P_U3_CTRL(i));
> > + }
> > +
> > + /* disable all u2 ports */
> > + for (i = 0; i < u2_port_num; i++) {
> > + temp = readl(ippc_base + U3P_U2_CTRL(i));
> > + temp |= CTRL_U2_PORT_PDN;
> > + writel(temp, ippc_base + U3P_U2_CTRL(i));
> > + }
> > +
> > + /* power off ip */
> > + temp = readl(ippc_base + U3P_IP_PW_CTRL1);
> > + temp |= CTRL1_IP_HOST_PDN;
> > + writel(temp, ippc_base + U3P_IP_PW_CTRL1);
> > +
> > + temp = readl(ippc_base + U3P_IP_PW_CTRL2);
> > + temp |= CTRL2_IP_DEV_PDN;
> > + writel(temp, ippc_base + U3P_IP_PW_CTRL2);
> > +
> > + ret = readl_poll_timeout(ippc_base + U3P_IP_PW_STS1, temp,
> > + (temp & STS1_IP_SLEEP_STS), 100, 100000);
> > + if (ret) {
> > + dev_err(mtk->dev, "ip sleep failed!!!\n");
> > + return ret;
> > + }
> > + return 0;
> > +}
> > +
> > +static void xhci_mtk_timing_init(struct xhci_hcd_mtk *mtk)
> > +{
> > + void __iomem *mbase = mtk->mac_base;
> > + int u3_port_num;
> > + u32 temp;
> > +
> > + temp = readl(mtk->ippc_base + U3P_IP_XHCI_CAP);
> > + u3_port_num = CAP_U3_PORT_NUM(temp);
> > +
> > + if (u3_port_num) {
> > + /* set MAC reference clock speed */
> > + temp = readl(mbase + U3P_UX_EXIT_LFPS_PARAM);
> > + temp &= ~RX_UX_EXIT_REF;
> > + temp |= RX_UX_EXIT_REF_VAL;
> > + writel(temp, mbase + U3P_UX_EXIT_LFPS_PARAM);
>
> Very nitpicky but... a bit of whitespace would be nice here.
>
Ok, I will add it later.
> > + /* set REF_CLK */
> > + temp = readl(mbase + U3P_REF_CLK_PARAM);
> > + temp &= ~REF_CLK_1000NS;
> > + temp |= REF_CLK_VAL_DEF;
> > + writel(temp, mbase + U3P_REF_CLK_PARAM);
> > + /* set SYS_CLK */
> > + temp = readl(mbase + U3P_TIMING_PULSE_CTRL);
> > + temp &= ~U3T_CNT_1US;
> > + temp |= U3T_CNT_1US_VAL;
> > + writel(temp, mbase + U3P_TIMING_PULSE_CTRL);
> > + /* set LINK_PM_TIMER=3 */
> > + temp = readl(mbase + U3P_LINK_PM_TIMER);
> > + temp &= ~PM_LC_TIMEOUT;
> > + temp |= PM_LC_TIMEOUT_VAL;
> > + writel(temp, mbase + U3P_LINK_PM_TIMER);
> > + }
> > +
> > + temp = readl(mbase + U3P_U2_TIMING_PARAM);
> > + temp &= ~U2T_VAL_1US;
> > + temp |= U2T_VAL_1US_VAL;
> > + writel(temp, mbase + U3P_U2_TIMING_PARAM);
> > +}
> > +
> > +static void xhci_mtk_ports_config(struct xhci_hcd_mtk *mtk)
> > +{
> > + u32 temp;
> > +
> > + /* reset whole ip */
> > + temp = readl(mtk->ippc_base + U3P_IP_PW_CTRL0);
> > + temp |= CTRL0_IP_SW_RST;
> > + writel(temp, mtk->ippc_base + U3P_IP_PW_CTRL0);
> > + udelay(1);
> > + temp = readl(mtk->ippc_base + U3P_IP_PW_CTRL0);
> > + temp &= ~CTRL0_IP_SW_RST;
> > + writel(temp, mtk->ippc_base + U3P_IP_PW_CTRL0);
> > +
> > + xhci_mtk_ports_enable(mtk);
> > + xhci_mtk_timing_init(mtk);
> > +}
> > +
> > +static int xhci_mtk_clks_enable(struct xhci_hcd_mtk *mtk)
> > +{
> > + int ret;
> > +
> > + ret = clk_prepare_enable(mtk->sys_mac);
> > + if (ret) {
> > + dev_err(mtk->dev, "failed to enable u3phya_ref\n");
> > + goto u3phya_ref_err;
> > + }
> > + ret = clk_prepare_enable(mtk->wk_deb_p0);
> > + if (ret) {
> > + dev_err(mtk->dev, "failed to enable wk_deb_p0\n");
> > + goto usb_p0_err;
> > + }
> > + if (mtk->num_phys > 1) {
> > + ret = clk_prepare_enable(mtk->wk_deb_p1);
> > + if (ret) {
> > + dev_err(mtk->dev, "failed to enable wk_deb_p1\n");
> > + goto usb_p1_err;
> > + }
> > + }
> > +
> > + return 0;
> > +
> > +usb_p1_err:
> > + clk_disable_unprepare(mtk->wk_deb_p0);
> > +usb_p0_err:
> > + clk_disable_unprepare(mtk->sys_mac);
> > +u3phya_ref_err:
> > + return -EINVAL;
> > +}
> > +
> > +static void xhci_mtk_clks_disable(struct xhci_hcd_mtk *mtk)
> > +{
> > + if (mtk->num_phys > 1)
> > + clk_disable_unprepare(mtk->wk_deb_p1);
> > + clk_disable_unprepare(mtk->wk_deb_p0);
> > + clk_disable_unprepare(mtk->sys_mac);
> > +}
> > +
> > +/* only clocks can be turn off for ip-sleep wakeup mode */
> > +static void usb_wakeup_ip_sleep_en(struct xhci_hcd_mtk *mtk)
> > +{
> > + u32 tmp;
> > + struct regmap *pericfg = mtk->pericfg;
> > +
> > + regmap_read(pericfg, PERI_WK_CTRL1, &tmp);
> > + tmp &= ~UWK_CTL1_IS_P;
> > + tmp &= ~(UWK_CTL1_IS_C(0xf));
> > + tmp |= UWK_CTL1_IS_C(0x8);
> > + regmap_write(pericfg, PERI_WK_CTRL1, tmp);
> > + regmap_write(pericfg, PERI_WK_CTRL1, tmp | UWK_CTL1_IS_E);
> > +
> > + regmap_read(pericfg, PERI_WK_CTRL1, &tmp);
> > + dev_dbg(mtk->dev, "%s(): WK_CTRL1[P6,E25,C26:29]=%#x\n",
> > + __func__, tmp);
> > +}
> > +
> > +static void usb_wakeup_ip_sleep_dis(struct xhci_hcd_mtk *mtk)
> > +{
> > + u32 tmp;
> > +
> > + regmap_read(mtk->pericfg, PERI_WK_CTRL1, &tmp);
> > + tmp &= ~UWK_CTL1_IS_E;
> > + regmap_write(mtk->pericfg, PERI_WK_CTRL1, tmp);
> > +}
> > +
> > +/*
> > +* for line-state wakeup mode, phy's power should not power-down
> > +* and only support cable plug in/out
> > +*/
> > +static void usb_wakeup_line_state_en(struct xhci_hcd_mtk *mtk)
> > +{
> > + u32 tmp;
> > + struct regmap *pericfg = mtk->pericfg;
> > +
> > + /* line-state of u2-port0 */
> > + regmap_read(pericfg, PERI_WK_CTRL1, &tmp);
> > + tmp &= ~UWK_CTL1_0P_LS_P;
> > + tmp &= ~(UWK_CTL1_0P_LS_C(0xf));
> > + tmp |= UWK_CTL1_0P_LS_C(0x8);
> > + regmap_write(pericfg, PERI_WK_CTRL1, tmp);
> > + regmap_read(pericfg, PERI_WK_CTRL1, &tmp);
> > + regmap_write(pericfg, PERI_WK_CTRL1, tmp | UWK_CTL1_0P_LS_E);
> > +
> > + /* line-state of u2-port1 if support */
> > + if (mtk->num_phys > 1) {
> > + regmap_read(pericfg, PERI_WK_CTRL0, &tmp);
> > + tmp &= ~(UWK_CTL1_1P_LS_C(0xf));
> > + tmp |= UWK_CTL1_1P_LS_C(0x8);
> > + regmap_write(pericfg, PERI_WK_CTRL0, tmp);
> > + regmap_write(pericfg, PERI_WK_CTRL0, tmp | UWK_CTL1_1P_LS_E);
> > + }
> > +}
> > +
> > +static void usb_wakeup_line_state_dis(struct xhci_hcd_mtk *mtk)
> > +{
> > + u32 tmp;
> > + struct regmap *pericfg = mtk->pericfg;
> > +
> > + regmap_read(pericfg, PERI_WK_CTRL1, &tmp);
> > + tmp &= ~UWK_CTL1_0P_LS_E;
> > + regmap_write(pericfg, PERI_WK_CTRL1, tmp);
> > +
> > + if (mtk->num_phys > 1) {
> > + regmap_read(pericfg, PERI_WK_CTRL0, &tmp);
> > + tmp &= ~UWK_CTL1_1P_LS_E;
> > + regmap_write(pericfg, PERI_WK_CTRL0, tmp);
> > + }
> > +}
> > +
> > +static void usb_wakeup_enable(struct xhci_hcd_mtk *mtk)
> > +{
> > + if (mtk->wakeup_src == SSUSB_WK_IP_SLEEP)
> > + usb_wakeup_ip_sleep_en(mtk);
> > + else if (mtk->wakeup_src == SSUSB_WK_LINE_STATE)
> > + usb_wakeup_line_state_en(mtk);
> > +}
> > +
> > +static void usb_wakeup_disable(struct xhci_hcd_mtk *mtk)
> > +{
> > + if (mtk->wakeup_src == SSUSB_WK_IP_SLEEP)
> > + usb_wakeup_ip_sleep_dis(mtk);
> > + else if (mtk->wakeup_src == SSUSB_WK_LINE_STATE)
> > + usb_wakeup_line_state_dis(mtk);
> > +}
> > +
> > +
> > +static int xhci_mtk_setup(struct usb_hcd *hcd);
> > +static const struct xhci_driver_overrides xhci_mtk_overrides __initconst = {
> > + .extra_priv_size = sizeof(struct xhci_hcd),
> > + .reset = xhci_mtk_setup,
> > +};
> > +
> > +static struct hc_driver __read_mostly xhci_mtk_hc_driver;
> > +
> > +static int xhci_mtk_phy_enable(struct xhci_hcd_mtk *mtk)
> > +{
> > + unsigned int i;
> > + int ret;
> > +
> > + for (i = 0; i < mtk->num_phys; i++) {
> > + ret = phy_init(mtk->phys[i]);
> > + if (ret)
> > + goto disable_phy;
> > + ret = phy_power_on(mtk->phys[i]);
> > + if (ret) {
> > + phy_exit(mtk->phys[i]);
> > + goto disable_phy;
> > + }
> > + }
> > +
> > + return 0;
> > +
> > +disable_phy:
> > + for (; i > 0; i--) {
> > + phy_power_off(mtk->phys[i - 1]);
> > + phy_exit(mtk->phys[i - 1]);
> > + }
> > + return ret;
> > +}
> > +
> > +static void xhci_mtk_phy_disable(struct xhci_hcd_mtk *mtk)
> > +{
> > + unsigned int i;
> > +
> > + for (i = 0; i < mtk->num_phys; i++) {
> > + phy_power_off(mtk->phys[i]);
> > + phy_exit(mtk->phys[i]);
> > + }
> > +}
> > +
> > +static int xhci_mtk_ldos_enable(struct xhci_hcd_mtk *mtk)
> > +{
> > + int ret;
> > +
> > + ret = regulator_enable(mtk->vbus);
> > + if (ret) {
> > + dev_err(mtk->dev, "failed to enable vbus\n");
> > + return ret;
> > + }
> > +
> > + ret = regulator_enable(mtk->vusb33);
> > + if (ret) {
> > + dev_err(mtk->dev, "failed to enable vusb33\n");
> > + regulator_disable(mtk->vbus);
> > + return ret;
> > + }
> > + return 0;
> > +}
> > +
> > +static void xhci_mtk_ldos_disable(struct xhci_hcd_mtk *mtk)
> > +{
> > + regulator_disable(mtk->vbus);
> > + regulator_disable(mtk->vusb33);
> > +}
> > +
> > +static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd *xhci)
> > +{
> > + /*
> > + * As of now platform drivers don't provide MSI support so we ensure
> > + * here that the generic code does not try to make a pci_dev from our
> > + * dev struct in order to setup MSI
> > + */
> > + xhci->quirks |= XHCI_PLAT;
> > + xhci->quirks |= XHCI_MTK_HOST;
> > + /*
> > + * MTK host controller gives a spurious successful event after a
> > + * short transfer. Ignore it.
> > + */
> > + xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
> > +}
> > +
> > +/* called during probe() after chip reset completes */
> > +static int xhci_mtk_setup(struct usb_hcd *hcd)
> > +{
> > + struct xhci_hcd *xhci;
> > + int ret;
> > +
> > + ret = xhci_gen_setup(hcd, xhci_mtk_quirks);
> > + if (ret)
> > + return ret;
> > +
> > + if (!usb_hcd_is_primary_hcd(hcd))
> > + return 0;
> > +
> > + xhci = hcd_to_xhci(hcd);
> > + ret = xhci_mtk_sch_init(xhci);
> > + if (ret) {
> > + kfree(xhci);
>
> Why are you freeing the xhci structure here?
>
It's my mistake, and can't free it here.
>
> > + return ret;
> > + }
> > +
> > + return ret;
> > +}
> > +
> > +
> > +static int xhci_mtk_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct device_node *node = dev->of_node;
> > + struct usb_xhci_pdata *pdata = dev_get_platdata(dev);
> > + struct xhci_hcd_mtk *mtk;
> > + const struct hc_driver *driver;
> > + struct xhci_hcd *xhci;
> > + struct resource *res;
> > + struct usb_hcd *hcd;
> > + struct phy *phy;
> > + int phy_num;
> > + int ret = -ENODEV;
> > + int irq;
> > +
> > + if (usb_disabled())
> > + return -ENODEV;
> > +
> > + driver = &xhci_mtk_hc_driver;
> > + mtk = devm_kzalloc(dev, sizeof(*mtk), GFP_KERNEL);
> > + if (!mtk)
> > + return -ENOMEM;
> > +
> > + mtk->dev = dev;
> > + mtk->vbus = devm_regulator_get(dev, "vbus");
> > + if (IS_ERR(mtk->vbus)) {
> > + dev_err(dev, "fail to get vbus\n");
> > + return PTR_ERR(mtk->vbus);
> > + }
> > +
> > + mtk->vusb33 = devm_regulator_get(dev, "vusb33");
> > + if (IS_ERR(mtk->vusb33)) {
> > + dev_err(dev, "fail to get vusb33\n");
> > + return PTR_ERR(mtk->vusb33);
> > + }
> > +
> > + mtk->sys_mac = devm_clk_get(dev, "sys_ck");
> > + if (IS_ERR(mtk->sys_mac)) {
> > + dev_err(dev, "fail to get sys_ck\n");
> > + return PTR_ERR(mtk->sys_mac);
> > + }
> > +
> > + of_property_read_u32(node, "mediatek,wakeup-src", &mtk->wakeup_src);
> > +
> > + mtk->wk_deb_p0 = devm_clk_get(dev, "wakeup_deb_p0");
> > + if (IS_ERR(mtk->wk_deb_p0)) {
> > + dev_err(dev, "fail to get wakeup_deb_p0\n");
> > + return PTR_ERR(mtk->wk_deb_p0);
> > + }
> > +
> > + mtk->wk_deb_p1 = devm_clk_get(dev, "wakeup_deb_p1");
> > + if (IS_ERR(mtk->wk_deb_p1)) {
> > + dev_err(dev, "fail to get wakeup_deb_p1\n");
> > + return PTR_ERR(mtk->wk_deb_p1);
> > + }
> > +
> > + mtk->pericfg = syscon_regmap_lookup_by_phandle(node,
> > + "mediatek,syscon-wakeup");
> > + if (IS_ERR(mtk->pericfg)) {
> > + dev_err(dev, "fail to get pericfg regs\n");
> > + return PTR_ERR(mtk->pericfg);
> > + }
> > +
> > + mtk->num_phys = of_count_phandle_with_args(node,
> > + "phys", "#phy-cells");
> > + if (mtk->num_phys > 0) {
> > + mtk->phys = devm_kcalloc(dev, mtk->num_phys,
> > + sizeof(*mtk->phys), GFP_KERNEL);
> > + if (!mtk->phys)
> > + return -ENOMEM;
> > + } else {
> > + mtk->num_phys = 0;
> > + }
> > + pm_runtime_enable(dev);
> > + pm_runtime_get_sync(dev);
> > +
> > + ret = xhci_mtk_ldos_enable(mtk);
> > + if (ret)
> > + goto disable_pm;
> > +
> > + ret = xhci_mtk_clks_enable(mtk);
> > + if (ret)
> > + goto disable_ldos;
> > +
> > + irq = platform_get_irq(pdev, 0);
> > + if (irq < 0)
> > + goto disable_clk;
> > +
> > + /* Initialize dma_mask and coherent_dma_mask to 32-bits */
> > + ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
> > + if (ret)
> > + goto disable_clk;
> > +
> > + if (!dev->dma_mask)
> > + dev->dma_mask = &dev->coherent_dma_mask;
> > + else
> > + dma_set_mask(dev, DMA_BIT_MASK(32));
> > +
> > + hcd = usb_create_hcd(driver, dev, dev_name(dev));
> > + if (!hcd) {
> > + ret = -ENOMEM;
> > + goto disable_clk;
> > + }
> > +
> > + /*
> > + * USB 2.0 roothub is stored in the platform_device.
> > + * Swap it with mtk HCD.
> > + */
> > + mtk->hcd = platform_get_drvdata(pdev);
> > + platform_set_drvdata(pdev, mtk);
> > +
> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + hcd->regs = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(hcd->regs)) {
> > + ret = PTR_ERR(hcd->regs);
> > + goto put_usb2_hcd;
> > + }
> > + hcd->rsrc_start = res->start;
> > + hcd->rsrc_len = resource_size(res);
> > + mtk->mac_base = hcd->regs;
> > +
> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> > + mtk->ippc_base = devm_ioremap_resource(dev, res);
> > + if (IS_ERR(mtk->ippc_base)) {
> > + ret = PTR_ERR(mtk->ippc_base);
> > + goto put_usb2_hcd;
> > + }
> > +
> > + for (phy_num = 0; phy_num < mtk->num_phys; phy_num++) {
> > + phy = devm_of_phy_get_by_index(dev, node, phy_num);
> > + if (IS_ERR(phy)) {
> > + ret = PTR_ERR(phy);
> > + goto put_usb2_hcd;
> > + }
> > + mtk->phys[phy_num] = phy;
> > + }
> > +
> > + xhci_mtk_ports_config(mtk);
> > + xhci_mtk_phy_enable(mtk);
> > + device_init_wakeup(dev, 1);
> > +
> > + xhci = hcd_to_xhci(hcd);
> > + xhci->main_hcd = hcd;
> > + xhci->shared_hcd = usb_create_shared_hcd(driver, dev,
> > + dev_name(dev), hcd);
> > + if (!xhci->shared_hcd) {
> > + ret = -ENOMEM;
> > + goto disable_usb_phy;
> > + }
> > +
> > + if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
> > + (pdata && pdata->usb3_lpm_capable))
> > + xhci->quirks |= XHCI_LPM_SUPPORT;
> > +
> > + if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
> > + xhci->shared_hcd->can_do_streams = 1;
> > +
> > + ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
> > + if (ret)
> > + goto put_usb3_hcd;
> > +
> > + ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
> > + if (ret)
> > + goto dealloc_usb2_hcd;
> > +
> > + return 0;
> > +
> > +dealloc_usb2_hcd:
> > + usb_remove_hcd(hcd);
> > +
> > +put_usb3_hcd:
> > + usb_put_hcd(xhci->shared_hcd);
> > +
> > +disable_usb_phy:
> > + xhci_mtk_phy_disable(mtk);
> > + device_init_wakeup(dev, 0);
> > +
> > +put_usb2_hcd:
> > + usb_put_hcd(hcd);
> > +
> > +disable_clk:
> > + xhci_mtk_clks_disable(mtk);
> > +
> > +disable_ldos:
> > + xhci_mtk_ldos_disable(mtk);
> > +
> > +disable_pm:
> > + pm_runtime_put_sync(dev);
> > + pm_runtime_disable(dev);
> > + return ret;
> > +}
> > +
> > +static int xhci_mtk_remove(struct platform_device *dev)
> > +{
> > + struct xhci_hcd_mtk *mtk = platform_get_drvdata(dev);
> > + struct usb_hcd *hcd = mtk->hcd;
> > + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> > +
> > + usb_remove_hcd(xhci->shared_hcd);
> > + xhci_mtk_phy_disable(mtk);
> > + device_init_wakeup(&dev->dev, 0);
> > +
> > + usb_remove_hcd(hcd);
> > + usb_put_hcd(xhci->shared_hcd);
> > + usb_put_hcd(hcd);
> > + xhci_mtk_sch_exit(xhci);
>
> Why isn't xhci_mtk_sch_exit() needed during the unwind of a failed probe?
>
I am sorry, how careless of me! and I will add it when probe fails.
>
> > + xhci_mtk_clks_disable(mtk);
> > + xhci_mtk_ldos_disable(mtk);
> > + pm_runtime_put_sync(&dev->dev);
> > + pm_runtime_disable(&dev->dev);
> > +
> > + return 0;
> > +}
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static int xhci_mtk_suspend(struct device *dev)
> > +{
> > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
> > +
> > + xhci_mtk_ports_disable(mtk);
> > + xhci_mtk_phy_disable(mtk);
> > + xhci_mtk_clks_disable(mtk);
> > + usb_wakeup_enable(mtk);
> > + return 0;
> > +}
> > +
> > +static int xhci_mtk_resume(struct device *dev)
> > +{
> > + struct xhci_hcd_mtk *mtk = dev_get_drvdata(dev);
> > +
> > + usb_wakeup_disable(mtk);
> > + xhci_mtk_clks_enable(mtk);
> > + xhci_mtk_phy_enable(mtk);
> > + xhci_mtk_ports_enable(mtk);
> > + return 0;
> > +}
> > +
> > +static const struct dev_pm_ops xhci_mtk_pm_ops = {
> > + SET_SYSTEM_SLEEP_PM_OPS(xhci_mtk_suspend, xhci_mtk_resume)
> > +};
> > +#define DEV_PM_OPS (&xhci_mtk_pm_ops)
> > +#else
> > +#define DEV_PM_OPS NULL
> > +#endif /* CONFIG_PM */
> > +
> > +#ifdef CONFIG_OF
> > +static const struct of_device_id mtk_xhci_of_match[] = {
> > + { .compatible = "mediatek,mt8173-xhci"},
> > + { },
> > +};
> > +MODULE_DEVICE_TABLE(of, mtk_xhci_of_match);
> > +#endif
> > +
> > +static struct platform_driver mtk_xhci_driver = {
> > + .probe = xhci_mtk_probe,
> > + .remove = xhci_mtk_remove,
> > + .driver = {
> > + .name = "xhci-mtk",
> > + .pm = DEV_PM_OPS,
> > + .of_match_table = of_match_ptr(mtk_xhci_of_match),
> > + },
> > +};
> > +
> > +static int __init xhci_mtk_init(void)
> > +{
> > + xhci_init_driver(&xhci_mtk_hc_driver, &xhci_mtk_overrides);
> > + return platform_driver_register(&mtk_xhci_driver);
> > +}
> > +module_init(xhci_mtk_init);
> > +
> > +static void __exit xhci_mtk_exit(void)
> > +{
> > + platform_driver_unregister(&mtk_xhci_driver);
> > +}
> > +module_exit(xhci_mtk_exit);
> > +
> > +MODULE_DESCRIPTION("MediaTek xHCI Host Controller Driver");
> > +MODULE_LICENSE("GPL v2");
> > diff --git a/drivers/usb/host/xhci-mtk.h b/drivers/usb/host/xhci-mtk.h
> > new file mode 100644
> > index 0000000..5adba62
> > --- /dev/null
> > +++ b/drivers/usb/host/xhci-mtk.h
> > @@ -0,0 +1,133 @@
> > +/*
> > + * Copyright (c) 2015 MediaTek Inc.
> > + * Author:
> > + * Zhigang.Wei <zhigang.wei@...iatek.com>
> > + * Chunfeng.Yun <chunfeng.yun@...iatek.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;
>
> This appears to be a write-only variable. I don't think anything reads
> from this field. Its also not documented.
>
>
> > + u32 max_packet_size;
>
> Also write only and undocumented. It is read from but only in code where
> the max_packet_size is already held in a local variable.
>
I will remove ep_type & max_packet_size later. Them are used to provide
some debug information before.
>
> > + 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;
> > +};
> > +
> > +struct xhci_hcd_mtk {
> > + struct device *dev;
> > + struct usb_hcd *hcd;
> > + struct mu3h_sch_bw_info *sch_array;
> > + void __iomem *mac_base;
> > + void __iomem *ippc_base;
> > + struct regulator *vusb33;
> > + struct regulator *vbus;
> > + struct clk *sys_mac; /* sys and mac clock */
> > + struct clk *wk_deb_p0; /* port0's wakeup debounce clock */
> > + struct clk *wk_deb_p1;
> > + struct regmap *pericfg;
> > + int wakeup_src;
> > + struct phy **phys;
> > + int num_phys;
> > +};
> > +
> > +#if IS_ENABLED(CONFIG_USB_XHCI_MTK)
> > +int xhci_mtk_sch_init(struct xhci_hcd *xhci);
> > +void xhci_mtk_sch_exit(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_sch_init(struct xhci_hcd *xhci)
> > +{
> > + return 0;
> > +}
> > +
> > +static inline void xhci_mtk_sch_exit(struct xhci_hcd *xhci)
> > +{
> > +}
>
> Why do we need dummy inlines for xhci_mtk_sch_init/_exit(). They are
> only ever called from xhci-mtk.c .
>
Yes, it is dummy functions and will be removed later.
>
> > +
> > +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)
> > +{
> > +}
> > +
> > +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_ */
> > diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
> > index 94416ff..73997a0 100644
> > --- 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
> > @@ -3131,9 +3132,14 @@ static int queue_bulk_sg_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> >
> > /* Set the TRB length, TD size, and interrupter fields. */
> > if (xhci->hci_version < 0x100) {
> > - remainder = xhci_td_remainder(
> > + if (xhci->quirks & XHCI_MTK_HOST) {
> > + remainder = xhci_mtk_td_remainder_quirk(
> > + running_total, trb_buff_len, urb);
> > + } else {
> > + remainder = xhci_td_remainder(
> > urb->transfer_buffer_length -
> > running_total);
> > + }
> > } else {
> > remainder = xhci_v1_0_td_remainder(running_total,
> > trb_buff_len, total_packet_count, urb,
> > @@ -3286,9 +3292,14 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> >
> > /* Set the TRB length, TD size, and interrupter fields. */
> > if (xhci->hci_version < 0x100) {
> > - remainder = xhci_td_remainder(
> > + if (xhci->quirks & XHCI_MTK_HOST) {
> > + remainder = xhci_mtk_td_remainder_quirk(
> > + running_total, trb_buff_len, urb);
> > + } else {
> > + remainder = xhci_td_remainder(
> > urb->transfer_buffer_length -
> > running_total);
> > + }
> > } else {
> > remainder = xhci_v1_0_td_remainder(running_total,
> > trb_buff_len, total_packet_count, urb,
> > @@ -3383,7 +3394,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> > field |= 0x1;
> >
> > /* xHCI 1.0 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);
> > @@ -3407,8 +3418,14 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> > field = TRB_TYPE(TRB_DATA);
> >
> > length_field = TRB_LEN(urb->transfer_buffer_length) |
> > - xhci_td_remainder(urb->transfer_buffer_length) |
> > TRB_INTR_TARGET(0);
> > +
> > + if (xhci->quirks & XHCI_MTK_HOST)
> > + length_field |= xhci_mtk_td_remainder_quirk(0,
> > + urb->transfer_buffer_length, urb);
> > + else
> > + length_field |= xhci_td_remainder(urb->transfer_buffer_length);
> > +
> > if (urb->transfer_buffer_length > 0) {
> > if (setup->bRequestType & USB_DIR_IN)
> > field |= TRB_DIR_IN;
> > @@ -3632,8 +3649,14 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags,
> >
> > /* Set the TRB length, TD size, & interrupter fields. */
> > if (xhci->hci_version < 0x100) {
> > - remainder = xhci_td_remainder(
> > - td_len - running_total);
> > + if (xhci->quirks & XHCI_MTK_HOST) {
> > + remainder = xhci_mtk_td_remainder_quirk(
> > + running_total, trb_buff_len,
> > + urb);
> > + } else {
> > + remainder = xhci_td_remainder(
> > + td_len - running_total);
> > + }
> > } else {
> > remainder = xhci_v1_0_td_remainder(
> > running_total, trb_buff_len,
> > diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> > index 7da0d60..209fc8a 100644
> > --- 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"
> > @@ -623,7 +624,11 @@ 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 */
> > @@ -1688,6 +1693,9 @@ int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> >
> > 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,
> > @@ -1783,6 +1791,15 @@ int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> > return -ENOMEM;
> > }
> >
> > + if (xhci->quirks & XHCI_MTK_HOST) {
> > + ret = xhci_mtk_add_ep_quirk(hcd, udev, ep);
> > + if (ret < 0) {
> > + xhci_free_or_cache_endpoint_ring(xhci,
> > + virt_dev, ep_index);
> > + return ret;
> > + }
> > + }
> > +
> > ctrl_ctx->add_flags |= cpu_to_le32(added_ctxs);
> > new_add_flags = le32_to_cpu(ctrl_ctx->add_flags);
> >
> > diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
> > index 31e46cc..d257ce3 100644
> > --- a/drivers/usb/host/xhci.h
> > +++ b/drivers/usb/host/xhci.h
> > @@ -1567,6 +1567,7 @@ 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)
> > unsigned int num_active_eps;
> > unsigned int limit_active_eps;
> > /* There are two roothubs to keep track of bus suspend info for */
> >
>
Thank you very much for your suggestion.
chunfeng
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