Merge tag 'usb-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB patches from Greg Kroah-Hartman:
 "Here's the big USB patch set for the 3.6-rc1 merge window.

  Lots of little changes in here, primarily for gadget controllers and
  drivers.  There's some scsi changes that I think also went in through
  the scsi tree, but they merge just fine.  All of these patches have
  been in the linux-next tree for a while now.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

Fix up trivial conflicts in include/scsi/scsi_device.h (same libata
conflict that Jeff had already encountered)

* tag 'usb-3.6-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (207 commits)
  usb: Add USB_QUIRK_RESET_RESUME for all Logitech UVC webcams
  usb: Add quirk detection based on interface information
  usb: s3c-hsotg: Add header file protection macros in s3c-hsotg.h
  USB: ehci-s5p: Add vbus setup function to the s5p ehci glue layer
  USB: add USB_VENDOR_AND_INTERFACE_INFO() macro
  USB: notify phy when root hub port connect change
  USB: remove 8 bytes of padding from usb_host_interface on 64 bit builds
  USB: option: add ZTE MF821D
  USB: sierra: QMI mode MC7710 moved to qcserial
  USB: qcserial: adding Sierra Wireless devices
  USB: qcserial: support generic Qualcomm serial ports
  USB: qcserial: make probe more flexible
  USB: qcserial: centralize probe exit path
  USB: qcserial: consolidate usb_set_interface calls
  USB: ehci-s5p: Add support for device tree
  USB: ohci-exynos: Add support for device tree
  USB: ehci-omap: fix compile failure(v1)
  usb: host: tegra: pass correct pointer in ehci_setup()
  USB: ehci-fsl: Update ifdef check to work on 64-bit ppc
  USB: serial: keyspan: Removed unrequired parentheses.
  ...

1 files changed, 226 insertions, 286 deletions

diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 1d9401e0990a..b05c6865b610 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -30,8 +30,7 @@
 #include <linux/vmalloc.h>
 #include <linux/errno.h>
 #include <linux/init.h>
-#include <linux/timer.h>
-#include <linux/ktime.h>
+#include <linux/hrtimer.h>
 #include <linux/list.h>
 #include <linux/interrupt.h>
 #include <linux/usb.h>
@@ -94,12 +93,6 @@ static const char	hcd_name [] = "ehci_hcd";
  */
 #define EHCI_TUNE_FLS           1       /* (medium) 512-frame schedule */
 
-#define EHCI_IAA_MSECS          10              /* arbitrary */
-#define EHCI_IO_JIFFIES         (HZ/10)         /* io watchdog > irq_thresh */
-#define EHCI_ASYNC_JIFFIES      (HZ/20)         /* async idle timeout */
-#define EHCI_SHRINK_JIFFIES     (DIV_ROUND_UP(HZ, 200) + 1)
-                                                /* 5-ms async qh unlink delay */
-
 /* Initial IRQ latency:  faster than hw default */
 static int log2_irq_thresh = 0;         // 0 to 6
 module_param (log2_irq_thresh, int, S_IRUGO);
@@ -130,41 +123,6 @@ MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
 
 /*-------------------------------------------------------------------------*/
 
-static void
-timer_action(struct ehci_hcd *ehci, enum ehci_timer_action action)
-{
-        /* Don't override timeouts which shrink or (later) disable
-         * the async ring; just the I/O watchdog.  Note that if a
-         * SHRINK were pending, OFF would never be requested.
-         */
-        if (timer_pending(&ehci->watchdog)
-                        && ((BIT(TIMER_ASYNC_SHRINK) | BIT(TIMER_ASYNC_OFF))
-                                & ehci->actions))
-                return;
-
-        if (!test_and_set_bit(action, &ehci->actions)) {
-                unsigned long t;
-
-                switch (action) {
-                case TIMER_IO_WATCHDOG:
-                        if (!ehci->need_io_watchdog)
-                                return;
-                        t = EHCI_IO_JIFFIES;
-                        break;
-                case TIMER_ASYNC_OFF:
-                        t = EHCI_ASYNC_JIFFIES;
-                        break;
-                /* case TIMER_ASYNC_SHRINK: */
-                default:
-                        t = EHCI_SHRINK_JIFFIES;
-                        break;
-                }
-                mod_timer(&ehci->watchdog, t + jiffies);
-        }
-}
-
-/*-------------------------------------------------------------------------*/
-
 /*
  * handshake - spin reading hc until handshake completes or fails
  * @ptr: address of hc register to be read
@@ -203,29 +161,30 @@ static int handshake (struct ehci_hcd *ehci, void __iomem *ptr,
 /* check TDI/ARC silicon is in host mode */
 static int tdi_in_host_mode (struct ehci_hcd *ehci)
 {
-        u32 __iomem     *reg_ptr;
         u32             tmp;
 
-        reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
-        tmp = ehci_readl(ehci, reg_ptr);
+        tmp = ehci_readl(ehci, &ehci->regs->usbmode);
         return (tmp & 3) == USBMODE_CM_HC;
 }
 
-/* force HC to halt state from unknown (EHCI spec section 2.3) */
+/*
+ * Force HC to halt state from unknown (EHCI spec section 2.3).
+ * Must be called with interrupts enabled and the lock not held.
+ */
 static int ehci_halt (struct ehci_hcd *ehci)
 {
-        u32     temp = ehci_readl(ehci, &ehci->regs->status);
+        u32     temp;
+
+        spin_lock_irq(&ehci->lock);
 
         /* disable any irqs left enabled by previous code */
         ehci_writel(ehci, 0, &ehci->regs->intr_enable);
 
-        if (ehci_is_TDI(ehci) && tdi_in_host_mode(ehci) == 0) {
+        if (ehci_is_TDI(ehci) && !tdi_in_host_mode(ehci)) {
+                spin_unlock_irq(&ehci->lock);
                 return 0;
         }
 
-        if ((temp & STS_HALT) != 0)
-                return 0;
-
         /*
          * This routine gets called during probe before ehci->command
          * has been initialized, so we can't rely on its value.
@@ -234,80 +193,20 @@ static int ehci_halt (struct ehci_hcd *ehci)
         temp = ehci_readl(ehci, &ehci->regs->command);
         temp &= ~(CMD_RUN | CMD_IAAD);
         ehci_writel(ehci, temp, &ehci->regs->command);
-        return handshake (ehci, &ehci->regs->status,
-                          STS_HALT, STS_HALT, 16 * 125);
-}
-
-#if defined(CONFIG_USB_SUSPEND) && defined(CONFIG_PPC_PS3)
-
-/*
- * The EHCI controller of the Cell Super Companion Chip used in the
- * PS3 will stop the root hub after all root hub ports are suspended.
- * When in this condition handshake will return -ETIMEDOUT.  The
- * STS_HLT bit will not be set, so inspection of the frame index is
- * used here to test for the condition.  If the condition is found
- * return success to allow the USB suspend to complete.
- */
-
-static int handshake_for_broken_root_hub(struct ehci_hcd *ehci,
-                                         void __iomem *ptr, u32 mask, u32 done,
-                                         int usec)
-{
-        unsigned int old_index;
-        int error;
-
-        if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
-                return -ETIMEDOUT;
-
-        old_index = ehci_read_frame_index(ehci);
-
-        error = handshake(ehci, ptr, mask, done, usec);
-
-        if (error == -ETIMEDOUT && ehci_read_frame_index(ehci) == old_index)
-                return 0;
-
-        return error;
-}
-
-#else
-
-static int handshake_for_broken_root_hub(struct ehci_hcd *ehci,
-                                         void __iomem *ptr, u32 mask, u32 done,
-                                         int usec)
-{
-        return -ETIMEDOUT;
-}
-
-#endif
 
-static int handshake_on_error_set_halt(struct ehci_hcd *ehci, void __iomem *ptr,
-                                       u32 mask, u32 done, int usec)
-{
-        int error;
-
-        error = handshake(ehci, ptr, mask, done, usec);
-        if (error == -ETIMEDOUT)
-                error = handshake_for_broken_root_hub(ehci, ptr, mask, done,
-                                                      usec);
-
-        if (error) {
-                ehci_halt(ehci);
-                ehci->rh_state = EHCI_RH_HALTED;
-                ehci_err(ehci, "force halt; handshake %p %08x %08x -> %d\n",
-                        ptr, mask, done, error);
-        }
+        spin_unlock_irq(&ehci->lock);
+        synchronize_irq(ehci_to_hcd(ehci)->irq);
 
-        return error;
+        return handshake(ehci, &ehci->regs->status,
+                          STS_HALT, STS_HALT, 16 * 125);
 }
 
 /* put TDI/ARC silicon into EHCI mode */
 static void tdi_reset (struct ehci_hcd *ehci)
 {
-        u32 __iomem     *reg_ptr;
         u32             tmp;
 
-        reg_ptr = (u32 __iomem *)(((u8 __iomem *)ehci->regs) + USBMODE);
-        tmp = ehci_readl(ehci, reg_ptr);
+        tmp = ehci_readl(ehci, &ehci->regs->usbmode);
         tmp |= USBMODE_CM_HC;
         /* The default byte access to MMR space is LE after
          * controller reset. Set the required endian mode
@@ -315,10 +214,13 @@ static void tdi_reset (struct ehci_hcd *ehci)
          */
         if (ehci_big_endian_mmio(ehci))
                 tmp |= USBMODE_BE;
-        ehci_writel(ehci, tmp, reg_ptr);
+        ehci_writel(ehci, tmp, &ehci->regs->usbmode);
 }
 
-/* reset a non-running (STS_HALT == 1) controller */
+/*
+ * Reset a non-running (STS_HALT == 1) controller.
+ * Must be called with interrupts enabled and the lock not held.
+ */
 static int ehci_reset (struct ehci_hcd *ehci)
 {
         int     retval;
@@ -339,9 +241,8 @@ static int ehci_reset (struct ehci_hcd *ehci)
 
         if (ehci->has_hostpc) {
                 ehci_writel(ehci, USBMODE_EX_HC | USBMODE_EX_VBPS,
-                        (u32 __iomem *)(((u8 *)ehci->regs) + USBMODE_EX));
-                ehci_writel(ehci, TXFIFO_DEFAULT,
-                        (u32 __iomem *)(((u8 *)ehci->regs) + TXFILLTUNING));
+                                &ehci->regs->usbmode_ex);
+                ehci_writel(ehci, TXFIFO_DEFAULT, &ehci->regs->txfill_tuning);
         }
         if (retval)
                 return retval;
@@ -357,36 +258,40 @@ static int ehci_reset (struct ehci_hcd *ehci)
         return retval;
 }
 
-/* idle the controller (from running) */
+/*
+ * Idle the controller (turn off the schedules).
+ * Must be called with interrupts enabled and the lock not held.
+ */
 static void ehci_quiesce (struct ehci_hcd *ehci)
 {
         u32     temp;
 
-#ifdef DEBUG
         if (ehci->rh_state != EHCI_RH_RUNNING)
-                BUG ();
-#endif
+                return;
 
         /* wait for any schedule enables/disables to take effect */
         temp = (ehci->command << 10) & (STS_ASS | STS_PSS);
-        if (handshake_on_error_set_halt(ehci, &ehci->regs->status,
-                                        STS_ASS | STS_PSS, temp, 16 * 125))
-                return;
+        handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, temp, 16 * 125);
 
         /* then disable anything that's still active */
+        spin_lock_irq(&ehci->lock);
         ehci->command &= ~(CMD_ASE | CMD_PSE);
         ehci_writel(ehci, ehci->command, &ehci->regs->command);
+        spin_unlock_irq(&ehci->lock);
 
         /* hardware can take 16 microframes to turn off ... */
-        handshake_on_error_set_halt(ehci, &ehci->regs->status,
-                                    STS_ASS | STS_PSS, 0, 16 * 125);
+        handshake(ehci, &ehci->regs->status, STS_ASS | STS_PSS, 0, 16 * 125);
 }
 
 /*-------------------------------------------------------------------------*/
 
 static void end_unlink_async(struct ehci_hcd *ehci);
+static void unlink_empty_async(struct ehci_hcd *ehci);
 static void ehci_work(struct ehci_hcd *ehci);
+static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
+static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh);
 
+#include "ehci-timer.c"
 #include "ehci-hub.c"
 #include "ehci-lpm.c"
 #include "ehci-mem.c"
@@ -396,68 +301,6 @@ static void ehci_work(struct ehci_hcd *ehci);
 
 /*-------------------------------------------------------------------------*/
 
-static void ehci_iaa_watchdog(unsigned long param)
-{
-        struct ehci_hcd         *ehci = (struct ehci_hcd *) param;
-        unsigned long           flags;
-
-        spin_lock_irqsave (&ehci->lock, flags);
-
-        /* Lost IAA irqs wedge things badly; seen first with a vt8235.
-         * So we need this watchdog, but must protect it against both
-         * (a) SMP races against real IAA firing and retriggering, and
-         * (b) clean HC shutdown, when IAA watchdog was pending.
-         */
-        if (ehci->reclaim
-                        && !timer_pending(&ehci->iaa_watchdog)
-                        && ehci->rh_state == EHCI_RH_RUNNING) {
-                u32 cmd, status;
-
-                /* If we get here, IAA is *REALLY* late.  It's barely
-                 * conceivable that the system is so busy that CMD_IAAD
-                 * is still legitimately set, so let's be sure it's
-                 * clear before we read STS_IAA.  (The HC should clear
-                 * CMD_IAAD when it sets STS_IAA.)
-                 */
-                cmd = ehci_readl(ehci, &ehci->regs->command);
-
-                /* If IAA is set here it either legitimately triggered
-                 * before we cleared IAAD above (but _way_ late, so we'll
-                 * still count it as lost) ... or a silicon erratum:
-                 * - VIA seems to set IAA without triggering the IRQ;
-                 * - IAAD potentially cleared without setting IAA.
-                 */
-                status = ehci_readl(ehci, &ehci->regs->status);
-                if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
-                        COUNT (ehci->stats.lost_iaa);
-                        ehci_writel(ehci, STS_IAA, &ehci->regs->status);
-                }
-
-                ehci_vdbg(ehci, "IAA watchdog: status %x cmd %x\n",
-                                status, cmd);
-                end_unlink_async(ehci);
-        }
-
-        spin_unlock_irqrestore(&ehci->lock, flags);
-}
-
-static void ehci_watchdog(unsigned long param)
-{
-        struct ehci_hcd         *ehci = (struct ehci_hcd *) param;
-        unsigned long           flags;
-
-        spin_lock_irqsave(&ehci->lock, flags);
-
-        /* stop async processing after it's idled a bit */
-        if (test_bit (TIMER_ASYNC_OFF, &ehci->actions))
-                start_unlink_async (ehci, ehci->async);
-
-        /* ehci could run by timer, without IRQs ... */
-        ehci_work (ehci);
-
-        spin_unlock_irqrestore (&ehci->lock, flags);
-}
-
 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
  * The firmware seems to think that powering off is a wakeup event!
  * This routine turns off remote wakeup and everything else, on all ports.
@@ -473,11 +316,14 @@ static void ehci_turn_off_all_ports(struct ehci_hcd *ehci)
 
 /*
  * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
- * Should be called with ehci->lock held.
+ * Must be called with interrupts enabled and the lock not held.
  */
 static void ehci_silence_controller(struct ehci_hcd *ehci)
 {
         ehci_halt(ehci);
+
+        spin_lock_irq(&ehci->lock);
+        ehci->rh_state = EHCI_RH_HALTED;
         ehci_turn_off_all_ports(ehci);
 
         /* make BIOS/etc use companion controller during reboot */
@@ -485,6 +331,7 @@ static void ehci_silence_controller(struct ehci_hcd *ehci)
 
         /* unblock posted writes */
         ehci_readl(ehci, &ehci->regs->configured_flag);
+        spin_unlock_irq(&ehci->lock);
 }
 
 /* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
@@ -495,12 +342,15 @@ static void ehci_shutdown(struct usb_hcd *hcd)
 {
         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
 
-        del_timer_sync(&ehci->watchdog);
-        del_timer_sync(&ehci->iaa_watchdog);
-
         spin_lock_irq(&ehci->lock);
-        ehci_silence_controller(ehci);
+        ehci->shutdown = true;
+        ehci->rh_state = EHCI_RH_STOPPING;
+        ehci->enabled_hrtimer_events = 0;
         spin_unlock_irq(&ehci->lock);
+
+        ehci_silence_controller(ehci);
+
+        hrtimer_cancel(&ehci->hrtimer);
 }
 
 static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
@@ -529,28 +379,33 @@ static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
  */
 static void ehci_work (struct ehci_hcd *ehci)
 {
-        timer_action_done (ehci, TIMER_IO_WATCHDOG);
-
         /* another CPU may drop ehci->lock during a schedule scan while
          * it reports urb completions.  this flag guards against bogus
          * attempts at re-entrant schedule scanning.
          */
-        if (ehci->scanning)
+        if (ehci->scanning) {
+                ehci->need_rescan = true;
                 return;
-        ehci->scanning = 1;
-        scan_async (ehci);
-        if (ehci->next_uframe != -1)
-                scan_periodic (ehci);
-        ehci->scanning = 0;
+        }
+        ehci->scanning = true;
+
+ rescan:
+        ehci->need_rescan = false;
+        if (ehci->async_count)
+                scan_async(ehci);
+        if (ehci->intr_count > 0)
+                scan_intr(ehci);
+        if (ehci->isoc_count > 0)
+                scan_isoc(ehci);
+        if (ehci->need_rescan)
+                goto rescan;
+        ehci->scanning = false;
 
         /* the IO watchdog guards against hardware or driver bugs that
          * misplace IRQs, and should let us run completely without IRQs.
          * such lossage has been observed on both VT6202 and VT8235.
          */
-        if (ehci->rh_state == EHCI_RH_RUNNING &&
-                        (ehci->async->qh_next.ptr != NULL ||
-                         ehci->periodic_sched != 0))
-                timer_action (ehci, TIMER_IO_WATCHDOG);
+        turn_on_io_watchdog(ehci);
 }
 
 /*
@@ -563,24 +418,22 @@ static void ehci_stop (struct usb_hcd *hcd)
         ehci_dbg (ehci, "stop\n");
 
         /* no more interrupts ... */
-        del_timer_sync (&ehci->watchdog);
-        del_timer_sync(&ehci->iaa_watchdog);
 
         spin_lock_irq(&ehci->lock);
-        if (ehci->rh_state == EHCI_RH_RUNNING)
-                ehci_quiesce (ehci);
+        ehci->enabled_hrtimer_events = 0;
+        spin_unlock_irq(&ehci->lock);
 
+        ehci_quiesce(ehci);
         ehci_silence_controller(ehci);
         ehci_reset (ehci);
-        spin_unlock_irq(&ehci->lock);
 
+        hrtimer_cancel(&ehci->hrtimer);
         remove_sysfs_files(ehci);
         remove_debug_files (ehci);
 
         /* root hub is shut down separately (first, when possible) */
         spin_lock_irq (&ehci->lock);
-        if (ehci->async)
-                ehci_work (ehci);
+        end_free_itds(ehci);
         spin_unlock_irq (&ehci->lock);
         ehci_mem_cleanup (ehci);
 
@@ -588,8 +441,8 @@ static void ehci_stop (struct usb_hcd *hcd)
                 usb_amd_dev_put();
 
 #ifdef  EHCI_STATS
-        ehci_dbg (ehci, "irq normal %ld err %ld reclaim %ld (lost %ld)\n",
-                ehci->stats.normal, ehci->stats.error, ehci->stats.reclaim,
+        ehci_dbg(ehci, "irq normal %ld err %ld iaa %ld (lost %ld)\n",
+                ehci->stats.normal, ehci->stats.error, ehci->stats.iaa,
                 ehci->stats.lost_iaa);
         ehci_dbg (ehci, "complete %ld unlink %ld\n",
                 ehci->stats.complete, ehci->stats.unlink);
@@ -614,13 +467,10 @@ static int ehci_init(struct usb_hcd *hcd)
          * keep io watchdog by default, those good HCDs could turn off it later
          */
         ehci->need_io_watchdog = 1;
-        init_timer(&ehci->watchdog);
-        ehci->watchdog.function = ehci_watchdog;
-        ehci->watchdog.data = (unsigned long) ehci;
 
-        init_timer(&ehci->iaa_watchdog);
-        ehci->iaa_watchdog.function = ehci_iaa_watchdog;
-        ehci->iaa_watchdog.data = (unsigned long) ehci;
+        hrtimer_init(&ehci->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
+        ehci->hrtimer.function = ehci_hrtimer_func;
+        ehci->next_hrtimer_event = EHCI_HRTIMER_NO_EVENT;
 
         hcc_params = ehci_readl(ehci, &ehci->caps->hcc_params);
 
@@ -635,6 +485,7 @@ static int ehci_init(struct usb_hcd *hcd)
          * periodic_size can shrink by USBCMD update if hcc_params allows.
          */
         ehci->periodic_size = DEFAULT_I_TDPS;
+        INIT_LIST_HEAD(&ehci->intr_qh_list);
         INIT_LIST_HEAD(&ehci->cached_itd_list);
         INIT_LIST_HEAD(&ehci->cached_sitd_list);
 
@@ -656,10 +507,6 @@ static int ehci_init(struct usb_hcd *hcd)
         else                                    // N microframes cached
                 ehci->i_thresh = 2 + HCC_ISOC_THRES(hcc_params);
 
-        ehci->reclaim = NULL;
-        ehci->next_uframe = -1;
-        ehci->clock_frame = -1;
-
         /*
          * dedicate a qh for the async ring head, since we couldn't unlink
          * a 'real' qh without stopping the async schedule [4.8].  use it
@@ -672,7 +519,7 @@ static int ehci_init(struct usb_hcd *hcd)
         hw->hw_next = QH_NEXT(ehci, ehci->async->qh_dma);
         hw->hw_info1 = cpu_to_hc32(ehci, QH_HEAD);
 #if defined(CONFIG_PPC_PS3)
-        hw->hw_info1 |= cpu_to_hc32(ehci, (1 << 7));    /* I = 1 */
+        hw->hw_info1 |= cpu_to_hc32(ehci, QH_INACTIVATE);
 #endif
         hw->hw_token = cpu_to_hc32(ehci, QTD_STS_HALT);
         hw->hw_qtd_next = EHCI_LIST_END(ehci);
@@ -813,7 +660,7 @@ static int ehci_run (struct usb_hcd *hcd)
         return 0;
 }
 
-static int __maybe_unused ehci_setup (struct usb_hcd *hcd)
+static int ehci_setup(struct usb_hcd *hcd)
 {
         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
         int retval;
@@ -828,15 +675,18 @@ static int __maybe_unused ehci_setup (struct usb_hcd *hcd)
 
         ehci->sbrn = HCD_USB2;
 
-        retval = ehci_halt(ehci);
+        /* data structure init */
+        retval = ehci_init(hcd);
         if (retval)
                 return retval;
 
-        /* data structure init */
-        retval = ehci_init(hcd);
+        retval = ehci_halt(ehci);
         if (retval)
                 return retval;
 
+        if (ehci_is_TDI(ehci))
+                tdi_reset(ehci);
+
         ehci_reset(ehci);
 
         return 0;
@@ -895,14 +745,28 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
 
         /* complete the unlinking of some qh [4.15.2.3] */
         if (status & STS_IAA) {
+
+                /* Turn off the IAA watchdog */
+                ehci->enabled_hrtimer_events &= ~BIT(EHCI_HRTIMER_IAA_WATCHDOG);
+
+                /*
+                 * Mild optimization: Allow another IAAD to reset the
+                 * hrtimer, if one occurs before the next expiration.
+                 * In theory we could always cancel the hrtimer, but
+                 * tests show that about half the time it will be reset
+                 * for some other event anyway.
+                 */
+                if (ehci->next_hrtimer_event == EHCI_HRTIMER_IAA_WATCHDOG)
+                        ++ehci->next_hrtimer_event;
+
                 /* guard against (alleged) silicon errata */
                 if (cmd & CMD_IAAD)
                         ehci_dbg(ehci, "IAA with IAAD still set?\n");
-                if (ehci->reclaim) {
-                        COUNT(ehci->stats.reclaim);
+                if (ehci->async_iaa) {
+                        COUNT(ehci->stats.iaa);
                         end_unlink_async(ehci);
                 } else
-                        ehci_dbg(ehci, "IAA with nothing to reclaim?\n");
+                        ehci_dbg(ehci, "IAA with nothing unlinked?\n");
         }
 
         /* remote wakeup [4.3.1] */
@@ -956,15 +820,19 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
                 ehci_err(ehci, "fatal error\n");
                 dbg_cmd(ehci, "fatal", cmd);
                 dbg_status(ehci, "fatal", status);
-                ehci_halt(ehci);
 dead:
-                ehci_reset(ehci);
-                ehci_writel(ehci, 0, &ehci->regs->configured_flag);
                 usb_hc_died(hcd);
-                /* generic layer kills/unlinks all urbs, then
-                 * uses ehci_stop to clean up the rest
-                 */
-                bh = 1;
+
+                /* Don't let the controller do anything more */
+                ehci->shutdown = true;
+                ehci->rh_state = EHCI_RH_STOPPING;
+                ehci->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
+                ehci_writel(ehci, ehci->command, &ehci->regs->command);
+                ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+                ehci_handle_controller_death(ehci);
+
+                /* Handle completions when the controller stops */
+                bh = 0;
         }
 
         if (bh)
@@ -1026,38 +894,6 @@ static int ehci_urb_enqueue (
         }
 }
 
-static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
-{
-        /* failfast */
-        if (ehci->rh_state != EHCI_RH_RUNNING && ehci->reclaim)
-                end_unlink_async(ehci);
-
-        /* If the QH isn't linked then there's nothing we can do
-         * unless we were called during a giveback, in which case
-         * qh_completions() has to deal with it.
-         */
-        if (qh->qh_state != QH_STATE_LINKED) {
-                if (qh->qh_state == QH_STATE_COMPLETING)
-                        qh->needs_rescan = 1;
-                return;
-        }
-
-        /* defer till later if busy */
-        if (ehci->reclaim) {
-                struct ehci_qh          *last;
-
-                for (last = ehci->reclaim;
-                                last->reclaim;
-                                last = last->reclaim)
-                        continue;
-                qh->qh_state = QH_STATE_UNLINK_WAIT;
-                last->reclaim = qh;
-
-        /* start IAA cycle */
-        } else
-                start_unlink_async (ehci, qh);
-}
-
 /* remove from hardware lists
  * completions normally happen asynchronously
  */
@@ -1084,7 +920,7 @@ static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
                 switch (qh->qh_state) {
                 case QH_STATE_LINKED:
                 case QH_STATE_COMPLETING:
-                        unlink_async(ehci, qh);
+                        start_unlink_async(ehci, qh);
                         break;
                 case QH_STATE_UNLINK:
                 case QH_STATE_UNLINK_WAIT:
@@ -1104,7 +940,7 @@ static int ehci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
                 switch (qh->qh_state) {
                 case QH_STATE_LINKED:
                 case QH_STATE_COMPLETING:
-                        intr_deschedule (ehci, qh);
+                        start_unlink_intr(ehci, qh);
                         break;
                 case QH_STATE_IDLE:
                         qh_completions (ehci, qh);
@@ -1152,11 +988,17 @@ rescan:
          * accelerate iso completions ... so spin a while.
          */
         if (qh->hw == NULL) {
-                ehci_vdbg (ehci, "iso delay\n");
-                goto idle_timeout;
+                struct ehci_iso_stream  *stream = ep->hcpriv;
+
+                if (!list_empty(&stream->td_list))
+                        goto idle_timeout;
+
+                /* BUG_ON(!list_empty(&stream->free_list)); */
+                kfree(stream);
+                goto done;
         }
 
-        if (ehci->rh_state != EHCI_RH_RUNNING)
+        if (ehci->rh_state < EHCI_RH_RUNNING)
                 qh->qh_state = QH_STATE_IDLE;
         switch (qh->qh_state) {
         case QH_STATE_LINKED:
@@ -1169,7 +1011,7 @@ rescan:
                  * may already be unlinked.
                  */
                 if (tmp)
-                        unlink_async(ehci, qh);
+                        start_unlink_async(ehci, qh);
                 /* FALL THROUGH */
         case QH_STATE_UNLINK:           /* wait for hw to finish? */
         case QH_STATE_UNLINK_WAIT:
@@ -1181,7 +1023,7 @@ idle_timeout:
                 if (qh->clearing_tt)
                         goto idle_timeout;
                 if (list_empty (&qh->qtd_list)) {
-                        qh_put (qh);
+                        qh_destroy(ehci, qh);
                         break;
                 }
                 /* else FALL THROUGH */
@@ -1194,8 +1036,8 @@ idle_timeout:
                         list_empty (&qh->qtd_list) ? "" : "(has tds)");
                 break;
         }
+ done:
         ep->hcpriv = NULL;
-done:
         spin_unlock_irqrestore (&ehci->lock, flags);
 }
 
@@ -1232,9 +1074,9 @@ ehci_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
                          * re-linking will call qh_refresh().
                          */
                         if (eptype == USB_ENDPOINT_XFER_BULK)
-                                unlink_async(ehci, qh);
+                                start_unlink_async(ehci, qh);
                         else
-                                intr_deschedule(ehci, qh);
+                                start_unlink_intr(ehci, qh);
                 }
         }
         spin_unlock_irqrestore(&ehci->lock, flags);
@@ -1247,6 +1089,104 @@ static int ehci_get_frame (struct usb_hcd *hcd)
 }
 
 /*-------------------------------------------------------------------------*/
+
+#ifdef  CONFIG_PM
+
+/* suspend/resume, section 4.3 */
+
+/* These routines handle the generic parts of controller suspend/resume */
+
+static int __maybe_unused ehci_suspend(struct usb_hcd *hcd, bool do_wakeup)
+{
+        struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
+
+        if (time_before(jiffies, ehci->next_statechange))
+                msleep(10);
+
+        /*
+         * Root hub was already suspended.  Disable IRQ emission and
+         * mark HW unaccessible.  The PM and USB cores make sure that
+         * the root hub is either suspended or stopped.
+         */
+        ehci_prepare_ports_for_controller_suspend(ehci, do_wakeup);
+
+        spin_lock_irq(&ehci->lock);
+        ehci_writel(ehci, 0, &ehci->regs->intr_enable);
+        (void) ehci_readl(ehci, &ehci->regs->intr_enable);
+
+        clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+        spin_unlock_irq(&ehci->lock);
+
+        return 0;
+}
+
+/* Returns 0 if power was preserved, 1 if power was lost */
+static int __maybe_unused ehci_resume(struct usb_hcd *hcd, bool hibernated)
+{
+        struct ehci_hcd         *ehci = hcd_to_ehci(hcd);
+
+        if (time_before(jiffies, ehci->next_statechange))
+                msleep(100);
+
+        /* Mark hardware accessible again as we are back to full power by now */
+        set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+
+        if (ehci->shutdown)
+                return 0;               /* Controller is dead */
+
+        /*
+         * If CF is still set and we aren't resuming from hibernation
+         * then we maintained suspend power.
+         * Just undo the effect of ehci_suspend().
+         */
+        if (ehci_readl(ehci, &ehci->regs->configured_flag) == FLAG_CF &&
+                        !hibernated) {
+                int     mask = INTR_MASK;
+
+                ehci_prepare_ports_for_controller_resume(ehci);
+
+                spin_lock_irq(&ehci->lock);
+                if (ehci->shutdown)
+                        goto skip;
+
+                if (!hcd->self.root_hub->do_remote_wakeup)
+                        mask &= ~STS_PCD;
+                ehci_writel(ehci, mask, &ehci->regs->intr_enable);
+                ehci_readl(ehci, &ehci->regs->intr_enable);
+ skip:
+                spin_unlock_irq(&ehci->lock);
+                return 0;
+        }
+
+        /*
+         * Else reset, to cope with power loss or resume from hibernation
+         * having let the firmware kick in during reboot.
+         */
+        usb_root_hub_lost_power(hcd->self.root_hub);
+        (void) ehci_halt(ehci);
+        (void) ehci_reset(ehci);
+
+        spin_lock_irq(&ehci->lock);
+        if (ehci->shutdown)
+                goto skip;
+
+        ehci_writel(ehci, ehci->command, &ehci->regs->command);
+        ehci_writel(ehci, FLAG_CF, &ehci->regs->configured_flag);
+        ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
+
+        ehci->rh_state = EHCI_RH_SUSPENDED;
+        spin_unlock_irq(&ehci->lock);
+
+        /* here we "know" root ports should always stay powered */
+        ehci_port_power(ehci, 1);
+
+        return 1;
+}
+
+#endif
+
+/*-------------------------------------------------------------------------*/
+
 /*
  * The EHCI in ChipIdea HDRC cannot be a separate module or device,
  * because its registers (and irq) are shared between host/gadget/otg