[PATCH] OHCI PM updates
[linux-2.6.git] / drivers / usb / host / ohci-hub.c
1 /*
2  * OHCI HCD (Host Controller Driver) for USB.
3  * 
4  * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
5  * (C) Copyright 2000-2004 David Brownell <dbrownell@users.sourceforge.net>
6  * 
7  * This file is licenced under GPL
8  */
9
10 /*-------------------------------------------------------------------------*/
11
12 /*
13  * OHCI Root Hub ... the nonsharable stuff
14  */
15
16 #define dbg_port(hc,label,num,value) \
17         ohci_dbg (hc, \
18                 "%s roothub.portstatus [%d] " \
19                 "= 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
20                 label, num, temp, \
21                 (temp & RH_PS_PRSC) ? " PRSC" : "", \
22                 (temp & RH_PS_OCIC) ? " OCIC" : "", \
23                 (temp & RH_PS_PSSC) ? " PSSC" : "", \
24                 (temp & RH_PS_PESC) ? " PESC" : "", \
25                 (temp & RH_PS_CSC) ? " CSC" : "", \
26                 \
27                 (temp & RH_PS_LSDA) ? " LSDA" : "", \
28                 (temp & RH_PS_PPS) ? " PPS" : "", \
29                 (temp & RH_PS_PRS) ? " PRS" : "", \
30                 (temp & RH_PS_POCI) ? " POCI" : "", \
31                 (temp & RH_PS_PSS) ? " PSS" : "", \
32                 \
33                 (temp & RH_PS_PES) ? " PES" : "", \
34                 (temp & RH_PS_CCS) ? " CCS" : "" \
35                 );
36
37 /*-------------------------------------------------------------------------*/
38
39 #ifdef  CONFIG_PM
40
41 #define OHCI_SCHED_ENABLES \
42         (OHCI_CTRL_CLE|OHCI_CTRL_BLE|OHCI_CTRL_PLE|OHCI_CTRL_IE)
43
44 static void dl_done_list (struct ohci_hcd *, struct pt_regs *);
45 static void finish_unlinks (struct ohci_hcd *, u16 , struct pt_regs *);
46 static int ohci_restart (struct ohci_hcd *ohci);
47
48 static int ohci_hub_suspend (struct usb_hcd *hcd)
49 {
50         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
51         int                     status = 0;
52         unsigned long           flags;
53
54         spin_lock_irqsave (&ohci->lock, flags);
55
56         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
57         switch (ohci->hc_control & OHCI_CTRL_HCFS) {
58         case OHCI_USB_RESUME:
59                 ohci_dbg (ohci, "resume/suspend?\n");
60                 ohci->hc_control &= ~OHCI_CTRL_HCFS;
61                 ohci->hc_control |= OHCI_USB_RESET;
62                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
63                 (void) ohci_readl (ohci, &ohci->regs->control);
64                 /* FALL THROUGH */
65         case OHCI_USB_RESET:
66                 status = -EBUSY;
67                 ohci_dbg (ohci, "needs reinit!\n");
68                 goto done;
69         case OHCI_USB_SUSPEND:
70                 ohci_dbg (ohci, "already suspended\n");
71                 goto done;
72         }
73         ohci_dbg (ohci, "suspend root hub\n");
74
75         /* First stop any processing */
76         if (ohci->hc_control & OHCI_SCHED_ENABLES) {
77                 int             limit;
78
79                 ohci->hc_control &= ~OHCI_SCHED_ENABLES;
80                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
81                 ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
82                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrstatus);
83
84                 /* sched disables take effect on the next frame,
85                  * then the last WDH could take 6+ msec
86                  */
87                 ohci_dbg (ohci, "stopping schedules ...\n");
88                 limit = 2000;
89                 while (limit > 0) {
90                         udelay (250);
91                         limit =- 250;
92                         if (ohci_readl (ohci, &ohci->regs->intrstatus)
93                                         & OHCI_INTR_SF)
94                                 break;
95                 }
96                 dl_done_list (ohci, NULL);
97                 mdelay (7);
98         }
99         dl_done_list (ohci, NULL);
100         finish_unlinks (ohci, ohci_frame_no(ohci), NULL);
101         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
102                         &ohci->regs->intrstatus);
103
104         /* maybe resume can wake root hub */
105         if (hcd->remote_wakeup)
106                 ohci->hc_control |= OHCI_CTRL_RWE;
107         else
108                 ohci->hc_control &= ~OHCI_CTRL_RWE;
109
110         /* Suspend hub ... this is the "global (to this bus) suspend" mode,
111          * which doesn't imply ports will first be individually suspended.
112          */
113         ohci->hc_control &= ~OHCI_CTRL_HCFS;
114         ohci->hc_control |= OHCI_USB_SUSPEND;
115         ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
116         (void) ohci_readl (ohci, &ohci->regs->control);
117
118         /* no resumes until devices finish suspending */
119         ohci->next_statechange = jiffies + msecs_to_jiffies (5);
120
121 done:
122         /* external suspend vs self autosuspend ... same effect */
123         if (status == 0)
124                 usb_hcd_suspend_root_hub(hcd);
125         spin_unlock_irqrestore (&ohci->lock, flags);
126         return status;
127 }
128
129 static inline struct ed *find_head (struct ed *ed)
130 {
131         /* for bulk and control lists */
132         while (ed->ed_prev)
133                 ed = ed->ed_prev;
134         return ed;
135 }
136
137 /* caller has locked the root hub */
138 static int ohci_hub_resume (struct usb_hcd *hcd)
139 {
140         struct ohci_hcd         *ohci = hcd_to_ohci (hcd);
141         u32                     temp, enables;
142         int                     status = -EINPROGRESS;
143
144         if (time_before (jiffies, ohci->next_statechange))
145                 msleep(5);
146
147         spin_lock_irq (&ohci->lock);
148         ohci->hc_control = ohci_readl (ohci, &ohci->regs->control);
149
150         if (ohci->hc_control & (OHCI_CTRL_IR | OHCI_SCHED_ENABLES)) {
151                 /* this can happen after resuming a swsusp snapshot */
152                 if (hcd->state == HC_STATE_RESUMING) {
153                         ohci_dbg (ohci, "BIOS/SMM active, control %03x\n",
154                                         ohci->hc_control);
155                         status = -EBUSY;
156                 /* this happens when pmcore resumes HC then root */
157                 } else {
158                         ohci_dbg (ohci, "duplicate resume\n");
159                         status = 0;
160                 }
161         } else switch (ohci->hc_control & OHCI_CTRL_HCFS) {
162         case OHCI_USB_SUSPEND:
163                 ohci->hc_control &= ~(OHCI_CTRL_HCFS|OHCI_SCHED_ENABLES);
164                 ohci->hc_control |= OHCI_USB_RESUME;
165                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
166                 (void) ohci_readl (ohci, &ohci->regs->control);
167                 ohci_dbg (ohci, "resume root hub\n");
168                 break;
169         case OHCI_USB_RESUME:
170                 /* HCFS changes sometime after INTR_RD */
171                 ohci_info (ohci, "wakeup\n");
172                 break;
173         case OHCI_USB_OPER:
174                 /* this can happen after resuming a swsusp snapshot */
175                 ohci_dbg (ohci, "snapshot resume? reinit\n");
176                 status = -EBUSY;
177                 break;
178         default:                /* RESET, we lost power */
179                 ohci_dbg (ohci, "lost power\n");
180                 status = -EBUSY;
181         }
182         spin_unlock_irq (&ohci->lock);
183         if (status == -EBUSY) {
184                 (void) ohci_init (ohci);
185                 return ohci_restart (ohci);
186         }
187         if (status != -EINPROGRESS)
188                 return status;
189
190         temp = ohci->num_ports;
191         enables = 0;
192         while (temp--) {
193                 u32 stat = ohci_readl (ohci,
194                                        &ohci->regs->roothub.portstatus [temp]);
195
196                 /* force global, not selective, resume */
197                 if (!(stat & RH_PS_PSS))
198                         continue;
199                 ohci_writel (ohci, RH_PS_POCI,
200                                 &ohci->regs->roothub.portstatus [temp]);
201         }
202
203         /* Some controllers (lucent erratum) need extra-long delays */
204         msleep (20 /* usb 11.5.1.10 */ + 12 /* 32 msec counter */ + 1);
205
206         temp = ohci_readl (ohci, &ohci->regs->control);
207         temp &= OHCI_CTRL_HCFS;
208         if (temp != OHCI_USB_RESUME) {
209                 ohci_err (ohci, "controller won't resume\n");
210                 return -EBUSY;
211         }
212
213         /* disable old schedule state, reinit from scratch */
214         ohci_writel (ohci, 0, &ohci->regs->ed_controlhead);
215         ohci_writel (ohci, 0, &ohci->regs->ed_controlcurrent);
216         ohci_writel (ohci, 0, &ohci->regs->ed_bulkhead);
217         ohci_writel (ohci, 0, &ohci->regs->ed_bulkcurrent);
218         ohci_writel (ohci, 0, &ohci->regs->ed_periodcurrent);
219         ohci_writel (ohci, (u32) ohci->hcca_dma, &ohci->regs->hcca);
220
221         /* Sometimes PCI D3 suspend trashes frame timings ... */
222         periodic_reinit (ohci);
223
224         /* interrupts might have been disabled */
225         ohci_writel (ohci, OHCI_INTR_INIT, &ohci->regs->intrenable);
226         if (ohci->ed_rm_list)
227                 ohci_writel (ohci, OHCI_INTR_SF, &ohci->regs->intrenable);
228         ohci_writel (ohci, ohci_readl (ohci, &ohci->regs->intrstatus),
229                         &ohci->regs->intrstatus);
230
231         /* Then re-enable operations */
232         ohci_writel (ohci, OHCI_USB_OPER, &ohci->regs->control);
233         (void) ohci_readl (ohci, &ohci->regs->control);
234         msleep (3);
235
236         temp = OHCI_CONTROL_INIT | OHCI_USB_OPER;
237         if (hcd->can_wakeup)
238                 temp |= OHCI_CTRL_RWC;
239         ohci->hc_control = temp;
240         ohci_writel (ohci, temp, &ohci->regs->control);
241         (void) ohci_readl (ohci, &ohci->regs->control);
242
243         /* TRSMRCY */
244         msleep (10);
245
246         /* keep it alive for ~5x suspend + resume costs */
247         ohci->next_statechange = jiffies + msecs_to_jiffies (250);
248
249         /* maybe turn schedules back on */
250         enables = 0;
251         temp = 0;
252         if (!ohci->ed_rm_list) {
253                 if (ohci->ed_controltail) {
254                         ohci_writel (ohci,
255                                         find_head (ohci->ed_controltail)->dma,
256                                         &ohci->regs->ed_controlhead);
257                         enables |= OHCI_CTRL_CLE;
258                         temp |= OHCI_CLF;
259                 }
260                 if (ohci->ed_bulktail) {
261                         ohci_writel (ohci, find_head (ohci->ed_bulktail)->dma,
262                                 &ohci->regs->ed_bulkhead);
263                         enables |= OHCI_CTRL_BLE;
264                         temp |= OHCI_BLF;
265                 }
266         }
267         if (hcd->self.bandwidth_isoc_reqs || hcd->self.bandwidth_int_reqs)
268                 enables |= OHCI_CTRL_PLE|OHCI_CTRL_IE;
269         if (enables) {
270                 ohci_dbg (ohci, "restarting schedules ... %08x\n", enables);
271                 ohci->hc_control |= enables;
272                 ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
273                 if (temp)
274                         ohci_writel (ohci, temp, &ohci->regs->cmdstatus);
275                 (void) ohci_readl (ohci, &ohci->regs->control);
276         }
277
278         return 0;
279 }
280
281 #endif  /* CONFIG_PM */
282
283 /*-------------------------------------------------------------------------*/
284
285 /* build "status change" packet (one or two bytes) from HC registers */
286
287 static int
288 ohci_hub_status_data (struct usb_hcd *hcd, char *buf)
289 {
290         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
291         int             i, changed = 0, length = 1;
292         int             can_suspend = hcd->can_wakeup;
293         unsigned long   flags;
294
295         spin_lock_irqsave (&ohci->lock, flags);
296
297         /* handle autosuspended root:  finish resuming before
298          * letting khubd or root hub timer see state changes.
299          */
300         if ((ohci->hc_control & OHCI_CTRL_HCFS) != OHCI_USB_OPER
301                         || !HC_IS_RUNNING(hcd->state)) {
302                 can_suspend = 0;
303                 goto done;
304         }
305
306         /* undocumented erratum seen on at least rev D */
307         if ((ohci->flags & OHCI_QUIRK_AMD756)
308                         && (roothub_a (ohci) & RH_A_NDP) > MAX_ROOT_PORTS) {
309                 ohci_warn (ohci, "bogus NDP, rereads as NDP=%d\n",
310                           ohci_readl (ohci, &ohci->regs->roothub.a) & RH_A_NDP);
311                 /* retry later; "should not happen" */
312                 goto done;
313         }
314
315         /* init status */
316         if (roothub_status (ohci) & (RH_HS_LPSC | RH_HS_OCIC))
317                 buf [0] = changed = 1;
318         else
319                 buf [0] = 0;
320         if (ohci->num_ports > 7) {
321                 buf [1] = 0;
322                 length++;
323         }
324
325         /* look at each port */
326         for (i = 0; i < ohci->num_ports; i++) {
327                 u32     status = roothub_portstatus (ohci, i);
328
329                 if (status & (RH_PS_CSC | RH_PS_PESC | RH_PS_PSSC
330                                 | RH_PS_OCIC | RH_PS_PRSC)) {
331                         changed = 1;
332                         if (i < 7)
333                             buf [0] |= 1 << (i + 1);
334                         else
335                             buf [1] |= 1 << (i - 7);
336                         continue;
337                 }
338
339                 /* can suspend if no ports are enabled; or if all all
340                  * enabled ports are suspended AND remote wakeup is on.
341                  */
342                 if (!(status & RH_PS_CCS))
343                         continue;
344                 if ((status & RH_PS_PSS) && hcd->remote_wakeup)
345                         continue;
346                 can_suspend = 0;
347         }
348 done:
349         spin_unlock_irqrestore (&ohci->lock, flags);
350
351 #ifdef CONFIG_PM
352         /* save power by suspending idle root hubs;
353          * INTR_RD wakes us when there's work
354          */
355         if (can_suspend
356                         && !changed
357                         && !ohci->ed_rm_list
358                         && ((OHCI_CTRL_HCFS | OHCI_SCHED_ENABLES)
359                                         & ohci->hc_control)
360                                 == OHCI_USB_OPER
361                         && time_after (jiffies, ohci->next_statechange)
362                         && usb_trylock_device (hcd->self.root_hub)
363                         ) {
364                 ohci_vdbg (ohci, "autosuspend\n");
365                 (void) ohci_hub_suspend (hcd);
366                 usb_unlock_device (hcd->self.root_hub);
367         }
368 #endif
369
370         return changed ? length : 0;
371 }
372
373 /*-------------------------------------------------------------------------*/
374
375 static void
376 ohci_hub_descriptor (
377         struct ohci_hcd                 *ohci,
378         struct usb_hub_descriptor       *desc
379 ) {
380         u32             rh = roothub_a (ohci);
381         u16             temp;
382
383         desc->bDescriptorType = 0x29;
384         desc->bPwrOn2PwrGood = (rh & RH_A_POTPGT) >> 24;
385         desc->bHubContrCurrent = 0;
386
387         desc->bNbrPorts = ohci->num_ports;
388         temp = 1 + (ohci->num_ports / 8);
389         desc->bDescLength = 7 + 2 * temp;
390
391         temp = 0;
392         if (rh & RH_A_NPS)              /* no power switching? */
393             temp |= 0x0002;
394         if (rh & RH_A_PSM)              /* per-port power switching? */
395             temp |= 0x0001;
396         if (rh & RH_A_NOCP)             /* no overcurrent reporting? */
397             temp |= 0x0010;
398         else if (rh & RH_A_OCPM)        /* per-port overcurrent reporting? */
399             temp |= 0x0008;
400         desc->wHubCharacteristics = (__force __u16)cpu_to_hc16(ohci, temp);
401
402         /* two bitmaps:  ports removable, and usb 1.0 legacy PortPwrCtrlMask */
403         rh = roothub_b (ohci);
404         memset(desc->bitmap, 0xff, sizeof(desc->bitmap));
405         desc->bitmap [0] = rh & RH_B_DR;
406         if (ohci->num_ports > 7) {
407                 desc->bitmap [1] = (rh & RH_B_DR) >> 8;
408                 desc->bitmap [2] = 0xff;
409         } else
410                 desc->bitmap [1] = 0xff;
411 }
412
413 /*-------------------------------------------------------------------------*/
414
415 #ifdef  CONFIG_USB_OTG
416
417 static int ohci_start_port_reset (struct usb_hcd *hcd, unsigned port)
418 {
419         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
420         u32                     status;
421
422         if (!port)
423                 return -EINVAL;
424         port--;
425
426         /* start port reset before HNP protocol times out */
427         status = ohci_readl(ohci, &ohci->regs->roothub.portstatus [port]);
428         if (!(status & RH_PS_CCS))
429                 return -ENODEV;
430
431         /* khubd will finish the reset later */
432         ohci_writel(ohci, RH_PS_PRS, &ohci->regs->roothub.portstatus [port]);
433         return 0;
434 }
435
436 static void start_hnp(struct ohci_hcd *ohci);
437
438 #else
439
440 #define ohci_start_port_reset           NULL
441
442 #endif
443
444 /*-------------------------------------------------------------------------*/
445
446
447 /* See usb 7.1.7.5:  root hubs must issue at least 50 msec reset signaling,
448  * not necessarily continuous ... to guard against resume signaling.
449  * The short timeout is safe for non-root hubs, and is backward-compatible
450  * with earlier Linux hosts.
451  */
452 #ifdef  CONFIG_USB_SUSPEND
453 #define PORT_RESET_MSEC         50
454 #else
455 #define PORT_RESET_MSEC         10
456 #endif
457
458 /* this timer value might be vendor-specific ... */
459 #define PORT_RESET_HW_MSEC      10
460
461 /* wrap-aware logic morphed from <linux/jiffies.h> */
462 #define tick_before(t1,t2) ((s16)(((s16)(t1))-((s16)(t2))) < 0)
463
464 /* called from some task, normally khubd */
465 static inline void root_port_reset (struct ohci_hcd *ohci, unsigned port)
466 {
467         __hc32 __iomem *portstat = &ohci->regs->roothub.portstatus [port];
468         u32     temp;
469         u16     now = ohci_readl(ohci, &ohci->regs->fmnumber);
470         u16     reset_done = now + PORT_RESET_MSEC;
471
472         /* build a "continuous enough" reset signal, with up to
473          * 3msec gap between pulses.  scheduler HZ==100 must work;
474          * this might need to be deadline-scheduled.
475          */
476         do {
477                 /* spin until any current reset finishes */
478                 for (;;) {
479                         temp = ohci_readl (ohci, portstat);
480                         if (!(temp & RH_PS_PRS))
481                                 break;
482                         udelay (500);
483                 } 
484
485                 if (!(temp & RH_PS_CCS))
486                         break;
487                 if (temp & RH_PS_PRSC)
488                         ohci_writel (ohci, RH_PS_PRSC, portstat);
489
490                 /* start the next reset, sleep till it's probably done */
491                 ohci_writel (ohci, RH_PS_PRS, portstat);
492                 msleep(PORT_RESET_HW_MSEC);
493                 now = ohci_readl(ohci, &ohci->regs->fmnumber);
494         } while (tick_before(now, reset_done));
495         /* caller synchronizes using PRSC */
496 }
497
498 static int ohci_hub_control (
499         struct usb_hcd  *hcd,
500         u16             typeReq,
501         u16             wValue,
502         u16             wIndex,
503         char            *buf,
504         u16             wLength
505 ) {
506         struct ohci_hcd *ohci = hcd_to_ohci (hcd);
507         int             ports = hcd_to_bus (hcd)->root_hub->maxchild;
508         u32             temp;
509         int             retval = 0;
510
511         switch (typeReq) {
512         case ClearHubFeature:
513                 switch (wValue) {
514                 case C_HUB_OVER_CURRENT:
515                         ohci_writel (ohci, RH_HS_OCIC,
516                                         &ohci->regs->roothub.status);
517                 case C_HUB_LOCAL_POWER:
518                         break;
519                 default:
520                         goto error;
521                 }
522                 break;
523         case ClearPortFeature:
524                 if (!wIndex || wIndex > ports)
525                         goto error;
526                 wIndex--;
527
528                 switch (wValue) {
529                 case USB_PORT_FEAT_ENABLE:
530                         temp = RH_PS_CCS;
531                         break;
532                 case USB_PORT_FEAT_C_ENABLE:
533                         temp = RH_PS_PESC;
534                         break;
535                 case USB_PORT_FEAT_SUSPEND:
536                         temp = RH_PS_POCI;
537                         if ((ohci->hc_control & OHCI_CTRL_HCFS)
538                                         != OHCI_USB_OPER)
539                                 usb_hcd_resume_root_hub(hcd);
540                         break;
541                 case USB_PORT_FEAT_C_SUSPEND:
542                         temp = RH_PS_PSSC;
543                         break;
544                 case USB_PORT_FEAT_POWER:
545                         temp = RH_PS_LSDA;
546                         break;
547                 case USB_PORT_FEAT_C_CONNECTION:
548                         temp = RH_PS_CSC;
549                         break;
550                 case USB_PORT_FEAT_C_OVER_CURRENT:
551                         temp = RH_PS_OCIC;
552                         break;
553                 case USB_PORT_FEAT_C_RESET:
554                         temp = RH_PS_PRSC;
555                         break;
556                 default:
557                         goto error;
558                 }
559                 ohci_writel (ohci, temp,
560                                 &ohci->regs->roothub.portstatus [wIndex]);
561                 // ohci_readl (ohci, &ohci->regs->roothub.portstatus [wIndex]);
562                 break;
563         case GetHubDescriptor:
564                 ohci_hub_descriptor (ohci, (struct usb_hub_descriptor *) buf);
565                 break;
566         case GetHubStatus:
567                 temp = roothub_status (ohci) & ~(RH_HS_CRWE | RH_HS_DRWE);
568                 *(__le32 *) buf = cpu_to_le32 (temp);
569                 break;
570         case GetPortStatus:
571                 if (!wIndex || wIndex > ports)
572                         goto error;
573                 wIndex--;
574                 temp = roothub_portstatus (ohci, wIndex);
575                 *(__le32 *) buf = cpu_to_le32 (temp);
576
577 #ifndef OHCI_VERBOSE_DEBUG
578         if (*(u16*)(buf+2))     /* only if wPortChange is interesting */
579 #endif
580                 dbg_port (ohci, "GetStatus", wIndex, temp);
581                 break;
582         case SetHubFeature:
583                 switch (wValue) {
584                 case C_HUB_OVER_CURRENT:
585                         // FIXME:  this can be cleared, yes?
586                 case C_HUB_LOCAL_POWER:
587                         break;
588                 default:
589                         goto error;
590                 }
591                 break;
592         case SetPortFeature:
593                 if (!wIndex || wIndex > ports)
594                         goto error;
595                 wIndex--;
596                 switch (wValue) {
597                 case USB_PORT_FEAT_SUSPEND:
598 #ifdef  CONFIG_USB_OTG
599                         if (hcd->self.otg_port == (wIndex + 1)
600                                         && hcd->self.b_hnp_enable)
601                                 start_hnp(ohci);
602                         else
603 #endif
604                         ohci_writel (ohci, RH_PS_PSS,
605                                 &ohci->regs->roothub.portstatus [wIndex]);
606                         break;
607                 case USB_PORT_FEAT_POWER:
608                         ohci_writel (ohci, RH_PS_PPS,
609                                 &ohci->regs->roothub.portstatus [wIndex]);
610                         break;
611                 case USB_PORT_FEAT_RESET:
612                         root_port_reset (ohci, wIndex);
613                         break;
614                 default:
615                         goto error;
616                 }
617                 break;
618
619         default:
620 error:
621                 /* "protocol stall" on error */
622                 retval = -EPIPE;
623         }
624         return retval;
625 }
626