2 * Copyright (C) 2001-2004 by David Brownell
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 /* this file is part of ehci-hcd.c */
21 /*-------------------------------------------------------------------------*/
24 * EHCI Root Hub ... the nonsharable stuff
26 * Registers don't need cpu_to_le32, that happens transparently
29 /*-------------------------------------------------------------------------*/
31 #ifdef CONFIG_USB_PERSIST
33 static int ehci_hub_control(
42 /* After a power loss, ports that were owned by the companion must be
43 * reset so that the companion can still own them.
45 static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
51 struct usb_hcd *hcd = ehci_to_hcd(ehci);
53 if (!ehci->owned_ports)
56 /* Give the connections some time to appear */
59 port = HCS_N_PORTS(ehci->hcs_params);
61 if (test_bit(port, &ehci->owned_ports)) {
62 reg = &ehci->regs->port_status[port];
63 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
65 /* Port already owned by companion? */
66 if (status & PORT_OWNER)
67 clear_bit(port, &ehci->owned_ports);
68 else if (test_bit(port, &ehci->companion_ports))
69 ehci_writel(ehci, status & ~PORT_PE, reg);
71 ehci_hub_control(hcd, SetPortFeature,
72 USB_PORT_FEAT_RESET, port + 1,
77 if (!ehci->owned_ports)
79 msleep(90); /* Wait for resets to complete */
81 port = HCS_N_PORTS(ehci->hcs_params);
83 if (test_bit(port, &ehci->owned_ports)) {
84 ehci_hub_control(hcd, GetPortStatus,
86 (char *) &buf, sizeof(buf));
88 /* The companion should now own the port,
89 * but if something went wrong the port must not
92 reg = &ehci->regs->port_status[port];
93 status = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
94 if (status & PORT_OWNER)
95 ehci_writel(ehci, status | PORT_CSC, reg);
97 ehci_dbg(ehci, "failed handover port %d: %x\n",
99 ehci_writel(ehci, status & ~PORT_PE, reg);
104 ehci->owned_ports = 0;
107 #else /* CONFIG_USB_PERSIST */
109 static inline void ehci_handover_companion_ports(struct ehci_hcd *ehci)
116 static int ehci_bus_suspend (struct usb_hcd *hcd)
118 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
122 ehci_dbg(ehci, "suspend root hub\n");
124 if (time_before (jiffies, ehci->next_statechange))
127 port = HCS_N_PORTS (ehci->hcs_params);
128 spin_lock_irq (&ehci->lock);
130 /* stop schedules, clean any completed work */
131 if (HC_IS_RUNNING(hcd->state)) {
133 hcd->state = HC_STATE_QUIESCING;
135 ehci->command = ehci_readl(ehci, &ehci->regs->command);
137 end_unlink_async(ehci);
140 /* Unlike other USB host controller types, EHCI doesn't have
141 * any notion of "global" or bus-wide suspend. The driver has
142 * to manually suspend all the active unsuspended ports, and
143 * then manually resume them in the bus_resume() routine.
145 ehci->bus_suspended = 0;
146 ehci->owned_ports = 0;
148 u32 __iomem *reg = &ehci->regs->port_status [port];
149 u32 t1 = ehci_readl(ehci, reg) & ~PORT_RWC_BITS;
152 /* keep track of which ports we suspend */
154 set_bit(port, &ehci->owned_ports);
155 else if ((t1 & PORT_PE) && !(t1 & PORT_SUSPEND)) {
157 set_bit(port, &ehci->bus_suspended);
160 /* enable remote wakeup on all ports */
161 if (device_may_wakeup(&hcd->self.root_hub->dev))
162 t2 |= PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E;
164 t2 &= ~(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E);
167 ehci_vdbg (ehci, "port %d, %08x -> %08x\n",
169 ehci_writel(ehci, t2, reg);
173 /* turn off now-idle HC */
174 del_timer_sync (&ehci->watchdog);
176 hcd->state = HC_STATE_SUSPENDED;
178 /* allow remote wakeup */
180 if (!device_may_wakeup(&hcd->self.root_hub->dev))
182 ehci_writel(ehci, mask, &ehci->regs->intr_enable);
183 ehci_readl(ehci, &ehci->regs->intr_enable);
185 ehci->next_statechange = jiffies + msecs_to_jiffies(10);
186 spin_unlock_irq (&ehci->lock);
191 /* caller has locked the root hub, and should reset/reinit on error */
192 static int ehci_bus_resume (struct usb_hcd *hcd)
194 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
199 if (time_before (jiffies, ehci->next_statechange))
201 spin_lock_irq (&ehci->lock);
202 if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
203 spin_unlock_irq(&ehci->lock);
207 /* Ideally and we've got a real resume here, and no port's power
208 * was lost. (For PCI, that means Vaux was maintained.) But we
209 * could instead be restoring a swsusp snapshot -- so that BIOS was
210 * the last user of the controller, not reset/pm hardware keeping
211 * state we gave to it.
213 power_okay = ehci_readl(ehci, &ehci->regs->intr_enable);
214 ehci_dbg(ehci, "resume root hub%s\n",
215 power_okay ? "" : " after power loss");
217 /* at least some APM implementations will try to deliver
218 * IRQs right away, so delay them until we're ready.
220 ehci_writel(ehci, 0, &ehci->regs->intr_enable);
222 /* re-init operational registers */
223 ehci_writel(ehci, 0, &ehci->regs->segment);
224 ehci_writel(ehci, ehci->periodic_dma, &ehci->regs->frame_list);
225 ehci_writel(ehci, (u32) ehci->async->qh_dma, &ehci->regs->async_next);
227 /* restore CMD_RUN, framelist size, and irq threshold */
228 ehci_writel(ehci, ehci->command, &ehci->regs->command);
230 /* Some controller/firmware combinations need a delay during which
231 * they set up the port statuses. See Bugzilla #8190. */
234 /* manually resume the ports we suspended during bus_suspend() */
235 i = HCS_N_PORTS (ehci->hcs_params);
237 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
238 temp &= ~(PORT_RWC_BITS
239 | PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E);
240 if (test_bit(i, &ehci->bus_suspended) &&
241 (temp & PORT_SUSPEND)) {
242 ehci->reset_done [i] = jiffies + msecs_to_jiffies (20);
245 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
247 i = HCS_N_PORTS (ehci->hcs_params);
250 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
251 if (test_bit(i, &ehci->bus_suspended) &&
252 (temp & PORT_SUSPEND)) {
253 temp &= ~(PORT_RWC_BITS | PORT_RESUME);
254 ehci_writel(ehci, temp, &ehci->regs->port_status [i]);
255 ehci_vdbg (ehci, "resumed port %d\n", i + 1);
258 (void) ehci_readl(ehci, &ehci->regs->command);
260 /* maybe re-activate the schedule(s) */
262 if (ehci->async->qh_next.qh)
264 if (ehci->periodic_sched)
267 ehci->command |= temp;
268 ehci_writel(ehci, ehci->command, &ehci->regs->command);
271 ehci->next_statechange = jiffies + msecs_to_jiffies(5);
272 hcd->state = HC_STATE_RUNNING;
274 /* Now we can safely re-enable irqs */
275 ehci_writel(ehci, INTR_MASK, &ehci->regs->intr_enable);
277 spin_unlock_irq (&ehci->lock);
280 ehci_handover_companion_ports(ehci);
286 #define ehci_bus_suspend NULL
287 #define ehci_bus_resume NULL
289 #endif /* CONFIG_PM */
291 /*-------------------------------------------------------------------------*/
293 /* Display the ports dedicated to the companion controller */
294 static ssize_t show_companion(struct device *dev,
295 struct device_attribute *attr,
298 struct ehci_hcd *ehci;
299 int nports, index, n;
300 int count = PAGE_SIZE;
303 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
304 nports = HCS_N_PORTS(ehci->hcs_params);
306 for (index = 0; index < nports; ++index) {
307 if (test_bit(index, &ehci->companion_ports)) {
308 n = scnprintf(ptr, count, "%d\n", index + 1);
317 * Sets the owner of a port
319 static void set_owner(struct ehci_hcd *ehci, int portnum, int new_owner)
321 u32 __iomem *status_reg;
325 status_reg = &ehci->regs->port_status[portnum];
328 * The controller won't set the OWNER bit if the port is
329 * enabled, so this loop will sometimes require at least two
330 * iterations: one to disable the port and one to set OWNER.
332 for (try = 4; try > 0; --try) {
333 spin_lock_irq(&ehci->lock);
334 port_status = ehci_readl(ehci, status_reg);
335 if ((port_status & PORT_OWNER) == new_owner
336 || (port_status & (PORT_OWNER | PORT_CONNECT))
340 port_status ^= PORT_OWNER;
341 port_status &= ~(PORT_PE | PORT_RWC_BITS);
342 ehci_writel(ehci, port_status, status_reg);
344 spin_unlock_irq(&ehci->lock);
351 * Dedicate or undedicate a port to the companion controller.
352 * Syntax is "[-]portnum", where a leading '-' sign means
353 * return control of the port to the EHCI controller.
355 static ssize_t store_companion(struct device *dev,
356 struct device_attribute *attr,
357 const char *buf, size_t count)
359 struct ehci_hcd *ehci;
360 int portnum, new_owner;
362 ehci = hcd_to_ehci(bus_to_hcd(dev_get_drvdata(dev)));
363 new_owner = PORT_OWNER; /* Owned by companion */
364 if (sscanf(buf, "%d", &portnum) != 1)
368 new_owner = 0; /* Owned by EHCI */
370 if (portnum <= 0 || portnum > HCS_N_PORTS(ehci->hcs_params))
374 set_bit(portnum, &ehci->companion_ports);
376 clear_bit(portnum, &ehci->companion_ports);
377 set_owner(ehci, portnum, new_owner);
380 static DEVICE_ATTR(companion, 0644, show_companion, store_companion);
382 static inline void create_companion_file(struct ehci_hcd *ehci)
386 /* with integrated TT there is no companion! */
387 if (!ehci_is_TDI(ehci))
388 i = device_create_file(ehci_to_hcd(ehci)->self.dev,
389 &dev_attr_companion);
392 static inline void remove_companion_file(struct ehci_hcd *ehci)
394 /* with integrated TT there is no companion! */
395 if (!ehci_is_TDI(ehci))
396 device_remove_file(ehci_to_hcd(ehci)->self.dev,
397 &dev_attr_companion);
401 /*-------------------------------------------------------------------------*/
403 static int check_reset_complete (
404 struct ehci_hcd *ehci,
406 u32 __iomem *status_reg,
409 if (!(port_status & PORT_CONNECT)) {
410 ehci->reset_done [index] = 0;
414 /* if reset finished and it's still not enabled -- handoff */
415 if (!(port_status & PORT_PE)) {
417 /* with integrated TT, there's nobody to hand it to! */
418 if (ehci_is_TDI(ehci)) {
420 "Failed to enable port %d on root hub TT\n",
425 ehci_dbg (ehci, "port %d full speed --> companion\n",
428 // what happens if HCS_N_CC(params) == 0 ?
429 port_status |= PORT_OWNER;
430 port_status &= ~PORT_RWC_BITS;
431 ehci_writel(ehci, port_status, status_reg);
434 ehci_dbg (ehci, "port %d high speed\n", index + 1);
439 /*-------------------------------------------------------------------------*/
442 /* build "status change" packet (one or two bytes) from HC registers */
445 ehci_hub_status_data (struct usb_hcd *hcd, char *buf)
447 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
448 u32 temp, status = 0;
450 int ports, i, retval = 1;
453 /* if !USB_SUSPEND, root hub timers won't get shut down ... */
454 if (!HC_IS_RUNNING(hcd->state))
457 /* init status to no-changes */
459 ports = HCS_N_PORTS (ehci->hcs_params);
465 /* Some boards (mostly VIA?) report bogus overcurrent indications,
466 * causing massive log spam unless we completely ignore them. It
467 * may be relevant that VIA VT8235 controllers, where PORT_POWER is
468 * always set, seem to clear PORT_OCC and PORT_CSC when writing to
469 * PORT_POWER; that's surprising, but maybe within-spec.
472 mask = PORT_CSC | PORT_PEC | PORT_OCC;
474 mask = PORT_CSC | PORT_PEC;
475 // PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND
477 /* no hub change reports (bit 0) for now (power, ...) */
479 /* port N changes (bit N)? */
480 spin_lock_irqsave (&ehci->lock, flags);
481 for (i = 0; i < ports; i++) {
482 temp = ehci_readl(ehci, &ehci->regs->port_status [i]);
485 * Return status information even for ports with OWNER set.
486 * Otherwise khubd wouldn't see the disconnect event when a
487 * high-speed device is switched over to the companion
488 * controller by the user.
491 if (!(temp & PORT_CONNECT))
492 ehci->reset_done [i] = 0;
493 if ((temp & mask) != 0
494 || ((temp & PORT_RESUME) != 0
495 && time_after_eq(jiffies,
496 ehci->reset_done[i]))) {
498 buf [0] |= 1 << (i + 1);
500 buf [1] |= 1 << (i - 7);
504 /* FIXME autosuspend idle root hubs */
505 spin_unlock_irqrestore (&ehci->lock, flags);
506 return status ? retval : 0;
509 /*-------------------------------------------------------------------------*/
512 ehci_hub_descriptor (
513 struct ehci_hcd *ehci,
514 struct usb_hub_descriptor *desc
516 int ports = HCS_N_PORTS (ehci->hcs_params);
519 desc->bDescriptorType = 0x29;
520 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
521 desc->bHubContrCurrent = 0;
523 desc->bNbrPorts = ports;
524 temp = 1 + (ports / 8);
525 desc->bDescLength = 7 + 2 * temp;
527 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
528 memset (&desc->bitmap [0], 0, temp);
529 memset (&desc->bitmap [temp], 0xff, temp);
531 temp = 0x0008; /* per-port overcurrent reporting */
532 if (HCS_PPC (ehci->hcs_params))
533 temp |= 0x0001; /* per-port power control */
535 temp |= 0x0002; /* no power switching */
537 // re-enable when we support USB_PORT_FEAT_INDICATOR below.
538 if (HCS_INDICATOR (ehci->hcs_params))
539 temp |= 0x0080; /* per-port indicators (LEDs) */
541 desc->wHubCharacteristics = (__force __u16)cpu_to_le16 (temp);
544 /*-------------------------------------------------------------------------*/
546 #define PORT_WAKE_BITS (PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
548 static int ehci_hub_control (
556 struct ehci_hcd *ehci = hcd_to_ehci (hcd);
557 int ports = HCS_N_PORTS (ehci->hcs_params);
558 u32 __iomem *status_reg = &ehci->regs->port_status[
559 (wIndex & 0xff) - 1];
566 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
567 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
568 * (track current state ourselves) ... blink for diagnostics,
569 * power, "this is the one", etc. EHCI spec supports this.
572 spin_lock_irqsave (&ehci->lock, flags);
574 case ClearHubFeature:
576 case C_HUB_LOCAL_POWER:
577 case C_HUB_OVER_CURRENT:
578 /* no hub-wide feature/status flags */
584 case ClearPortFeature:
585 if (!wIndex || wIndex > ports)
588 temp = ehci_readl(ehci, status_reg);
591 * Even if OWNER is set, so the port is owned by the
592 * companion controller, khubd needs to be able to clear
593 * the port-change status bits (especially
594 * USB_PORT_FEAT_C_CONNECTION).
598 case USB_PORT_FEAT_ENABLE:
599 ehci_writel(ehci, temp & ~PORT_PE, status_reg);
601 case USB_PORT_FEAT_C_ENABLE:
602 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_PEC,
605 case USB_PORT_FEAT_SUSPEND:
606 if (temp & PORT_RESET)
608 if (ehci->no_selective_suspend)
610 if (temp & PORT_SUSPEND) {
611 if ((temp & PORT_PE) == 0)
613 /* resume signaling for 20 msec */
614 temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
615 ehci_writel(ehci, temp | PORT_RESUME,
617 ehci->reset_done [wIndex] = jiffies
618 + msecs_to_jiffies (20);
621 case USB_PORT_FEAT_C_SUSPEND:
622 /* we auto-clear this feature */
624 case USB_PORT_FEAT_POWER:
625 if (HCS_PPC (ehci->hcs_params))
627 temp & ~(PORT_RWC_BITS | PORT_POWER),
630 case USB_PORT_FEAT_C_CONNECTION:
631 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_CSC,
634 case USB_PORT_FEAT_C_OVER_CURRENT:
635 ehci_writel(ehci, (temp & ~PORT_RWC_BITS) | PORT_OCC,
638 case USB_PORT_FEAT_C_RESET:
639 /* GetPortStatus clears reset */
644 ehci_readl(ehci, &ehci->regs->command); /* unblock posted write */
646 case GetHubDescriptor:
647 ehci_hub_descriptor (ehci, (struct usb_hub_descriptor *)
651 /* no hub-wide feature/status flags */
653 //cpu_to_le32s ((u32 *) buf);
656 if (!wIndex || wIndex > ports)
660 temp = ehci_readl(ehci, status_reg);
664 status |= 1 << USB_PORT_FEAT_C_CONNECTION;
666 status |= 1 << USB_PORT_FEAT_C_ENABLE;
668 if ((temp & PORT_OCC) && !ignore_oc){
669 status |= 1 << USB_PORT_FEAT_C_OVER_CURRENT;
672 * Hubs should disable port power on over-current.
673 * However, not all EHCI implementations do this
674 * automatically, even if they _do_ support per-port
675 * power switching; they're allowed to just limit the
676 * current. khubd will turn the power back on.
678 if (HCS_PPC (ehci->hcs_params)){
680 temp & ~(PORT_RWC_BITS | PORT_POWER),
685 /* whoever resumes must GetPortStatus to complete it!! */
686 if (temp & PORT_RESUME) {
688 /* Remote Wakeup received? */
689 if (!ehci->reset_done[wIndex]) {
690 /* resume signaling for 20 msec */
691 ehci->reset_done[wIndex] = jiffies
692 + msecs_to_jiffies(20);
693 /* check the port again */
694 mod_timer(&ehci_to_hcd(ehci)->rh_timer,
695 ehci->reset_done[wIndex]);
698 /* resume completed? */
699 else if (time_after_eq(jiffies,
700 ehci->reset_done[wIndex])) {
701 status |= 1 << USB_PORT_FEAT_C_SUSPEND;
702 ehci->reset_done[wIndex] = 0;
704 /* stop resume signaling */
705 temp = ehci_readl(ehci, status_reg);
707 temp & ~(PORT_RWC_BITS | PORT_RESUME),
709 retval = handshake(ehci, status_reg,
710 PORT_RESUME, 0, 2000 /* 2msec */);
713 "port %d resume error %d\n",
717 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
721 /* whoever resets must GetPortStatus to complete it!! */
722 if ((temp & PORT_RESET)
723 && time_after_eq(jiffies,
724 ehci->reset_done[wIndex])) {
725 status |= 1 << USB_PORT_FEAT_C_RESET;
726 ehci->reset_done [wIndex] = 0;
728 /* force reset to complete */
729 ehci_writel(ehci, temp & ~(PORT_RWC_BITS | PORT_RESET),
731 /* REVISIT: some hardware needs 550+ usec to clear
732 * this bit; seems too long to spin routinely...
734 retval = handshake(ehci, status_reg,
737 ehci_err (ehci, "port %d reset error %d\n",
742 /* see what we found out */
743 temp = check_reset_complete (ehci, wIndex, status_reg,
744 ehci_readl(ehci, status_reg));
747 /* transfer dedicated ports to the companion hc */
748 if ((temp & PORT_CONNECT) &&
749 test_bit(wIndex, &ehci->companion_ports)) {
750 temp &= ~PORT_RWC_BITS;
752 ehci_writel(ehci, temp, status_reg);
753 ehci_dbg(ehci, "port %d --> companion\n", wIndex + 1);
754 temp = ehci_readl(ehci, status_reg);
758 * Even if OWNER is set, there's no harm letting khubd
759 * see the wPortStatus values (they should all be 0 except
760 * for PORT_POWER anyway).
763 if (temp & PORT_CONNECT) {
764 status |= 1 << USB_PORT_FEAT_CONNECTION;
765 // status may be from integrated TT
766 status |= ehci_port_speed(ehci, temp);
769 status |= 1 << USB_PORT_FEAT_ENABLE;
770 if (temp & (PORT_SUSPEND|PORT_RESUME))
771 status |= 1 << USB_PORT_FEAT_SUSPEND;
773 status |= 1 << USB_PORT_FEAT_OVER_CURRENT;
774 if (temp & PORT_RESET)
775 status |= 1 << USB_PORT_FEAT_RESET;
776 if (temp & PORT_POWER)
777 status |= 1 << USB_PORT_FEAT_POWER;
779 #ifndef EHCI_VERBOSE_DEBUG
780 if (status & ~0xffff) /* only if wPortChange is interesting */
782 dbg_port (ehci, "GetStatus", wIndex + 1, temp);
783 put_unaligned(cpu_to_le32 (status), (__le32 *) buf);
787 case C_HUB_LOCAL_POWER:
788 case C_HUB_OVER_CURRENT:
789 /* no hub-wide feature/status flags */
796 selector = wIndex >> 8;
798 if (!wIndex || wIndex > ports)
801 temp = ehci_readl(ehci, status_reg);
802 if (temp & PORT_OWNER)
805 temp &= ~PORT_RWC_BITS;
807 case USB_PORT_FEAT_SUSPEND:
808 if (ehci->no_selective_suspend)
810 if ((temp & PORT_PE) == 0
811 || (temp & PORT_RESET) != 0)
813 if (device_may_wakeup(&hcd->self.root_hub->dev))
814 temp |= PORT_WAKE_BITS;
815 ehci_writel(ehci, temp | PORT_SUSPEND, status_reg);
817 case USB_PORT_FEAT_POWER:
818 if (HCS_PPC (ehci->hcs_params))
819 ehci_writel(ehci, temp | PORT_POWER,
822 case USB_PORT_FEAT_RESET:
823 if (temp & PORT_RESUME)
825 /* line status bits may report this as low speed,
826 * which can be fine if this root hub has a
827 * transaction translator built in.
829 if ((temp & (PORT_PE|PORT_CONNECT)) == PORT_CONNECT
830 && !ehci_is_TDI(ehci)
831 && PORT_USB11 (temp)) {
833 "port %d low speed --> companion\n",
837 ehci_vdbg (ehci, "port %d reset\n", wIndex + 1);
842 * caller must wait, then call GetPortStatus
843 * usb 2.0 spec says 50 ms resets on root
845 ehci->reset_done [wIndex] = jiffies
846 + msecs_to_jiffies (50);
848 ehci_writel(ehci, temp, status_reg);
851 /* For downstream facing ports (these): one hub port is put
852 * into test mode according to USB2 11.24.2.13, then the hub
853 * must be reset (which for root hub now means rmmod+modprobe,
854 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
855 * about the EHCI-specific stuff.
857 case USB_PORT_FEAT_TEST:
858 if (!selector || selector > 5)
862 temp |= selector << 16;
863 ehci_writel(ehci, temp, status_reg);
869 ehci_readl(ehci, &ehci->regs->command); /* unblock posted writes */
874 /* "stall" on error */
877 spin_unlock_irqrestore (&ehci->lock, flags);
881 static void ehci_relinquish_port(struct usb_hcd *hcd, int portnum)
883 struct ehci_hcd *ehci = hcd_to_ehci(hcd);
885 if (ehci_is_TDI(ehci))
887 set_owner(ehci, --portnum, PORT_OWNER);