1 /* $NetBSD: dwc2_coreintr.c,v 1.11 2016/02/24 22:17:54 skrll Exp $ */
2
3 /*
4 * core_intr.c - DesignWare HS OTG Controller common interrupt handling
5 *
6 * Copyright (C) 2004-2013 Synopsys, Inc.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions, and the following disclaimer,
13 * without modification.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The names of the above-listed copyright holders may not be used
18 * to endorse or promote products derived from this software without
19 * specific prior written permission.
20 *
21 * ALTERNATIVELY, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") as published by the Free Software
23 * Foundation; either version 2 of the License, or (at your option) any
24 * later version.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
28 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
30 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 /*
40 * This file contains the common interrupt handlers
41 */
42
43 #include <sys/cdefs.h>
44 __KERNEL_RCSID(0, "$NetBSD: dwc2_coreintr.c,v 1.11 2016/02/24 22:17:54 skrll Exp $");
45
46 #include <sys/param.h>
47 #include <sys/kernel.h>
48 #include <sys/mutex.h>
49 #include <sys/pool.h>
50 #include <sys/bus.h>
51 #include <sys/callout.h>
52
53 #include <dev/usb/usb.h>
54 #include <dev/usb/usbdi.h>
55 #include <dev/usb/usbdivar.h>
56 #include <dev/usb/usb_mem.h>
57
58 #include <linux/kernel.h>
59 #include <linux/list.h>
60 #include <linux/err.h>
61
62 #include <dwc2/dwc2.h>
63 #include <dwc2/dwc2var.h>
64
65 #include "dwc2_core.h"
66 #include "dwc2_hcd.h"
67
68 #ifdef DWC2_DEBUG
dwc2_op_state_str(struct dwc2_hsotg * hsotg)69 static const char *dwc2_op_state_str(struct dwc2_hsotg *hsotg)
70 {
71 switch (hsotg->op_state) {
72 case OTG_STATE_A_HOST:
73 return "a_host";
74 case OTG_STATE_A_SUSPEND:
75 return "a_suspend";
76 case OTG_STATE_A_PERIPHERAL:
77 return "a_peripheral";
78 case OTG_STATE_B_PERIPHERAL:
79 return "b_peripheral";
80 case OTG_STATE_B_HOST:
81 return "b_host";
82 default:
83 return "unknown";
84 }
85 }
86 #endif
87
88 /**
89 * dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts.
90 * When the PRTINT interrupt fires, there are certain status bits in the Host
91 * Port that needs to get cleared.
92 *
93 * @hsotg: Programming view of DWC_otg controller
94 */
dwc2_handle_usb_port_intr(struct dwc2_hsotg * hsotg)95 static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg)
96 {
97 u32 hprt0 = DWC2_READ_4(hsotg, HPRT0);
98
99 if (hprt0 & HPRT0_ENACHG) {
100 hprt0 &= ~HPRT0_ENA;
101 DWC2_WRITE_4(hsotg, HPRT0, hprt0);
102 }
103 }
104
105 /**
106 * dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message
107 *
108 * @hsotg: Programming view of DWC_otg controller
109 */
dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg * hsotg)110 static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg)
111 {
112 /* Clear interrupt */
113 DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_MODEMIS);
114
115 dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
116 dwc2_is_host_mode(hsotg) ? "Host" : "Device");
117 }
118
119 /**
120 * dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG
121 * Interrupt Register (GOTGINT) to determine what interrupt has occurred.
122 *
123 * @hsotg: Programming view of DWC_otg controller
124 */
dwc2_handle_otg_intr(struct dwc2_hsotg * hsotg)125 static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg)
126 {
127 u32 gotgint;
128 u32 gotgctl;
129 u32 gintmsk;
130
131 gotgint = DWC2_READ_4(hsotg, GOTGINT);
132 gotgctl = DWC2_READ_4(hsotg, GOTGCTL);
133 dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint,
134 dwc2_op_state_str(hsotg));
135
136 if (gotgint & GOTGINT_SES_END_DET) {
137 dev_dbg(hsotg->dev,
138 " ++OTG Interrupt: Session End Detected++ (%s)\n",
139 dwc2_op_state_str(hsotg));
140 gotgctl = DWC2_READ_4(hsotg, GOTGCTL);
141
142 if (dwc2_is_device_mode(hsotg))
143 dwc2_hsotg_disconnect(hsotg);
144
145 if (hsotg->op_state == OTG_STATE_B_HOST) {
146 hsotg->op_state = OTG_STATE_B_PERIPHERAL;
147 } else {
148 /*
149 * If not B_HOST and Device HNP still set, HNP did
150 * not succeed!
151 */
152 if (gotgctl & GOTGCTL_DEVHNPEN) {
153 dev_dbg(hsotg->dev, "Session End Detected\n");
154 dev_err(hsotg->dev,
155 "Device Not Connected/Responding!\n");
156 }
157
158 /*
159 * If Session End Detected the B-Cable has been
160 * disconnected
161 */
162 /* Reset to a clean state */
163 hsotg->lx_state = DWC2_L0;
164 }
165
166 gotgctl = DWC2_READ_4(hsotg, GOTGCTL);
167 gotgctl &= ~GOTGCTL_DEVHNPEN;
168 DWC2_WRITE_4(hsotg, GOTGCTL, gotgctl);
169 }
170
171 if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) {
172 dev_dbg(hsotg->dev,
173 " ++OTG Interrupt: Session Request Success Status Change++\n");
174 gotgctl = DWC2_READ_4(hsotg, GOTGCTL);
175 if (gotgctl & GOTGCTL_SESREQSCS) {
176 if (hsotg->core_params->phy_type ==
177 DWC2_PHY_TYPE_PARAM_FS
178 && hsotg->core_params->i2c_enable > 0) {
179 hsotg->srp_success = 1;
180 } else {
181 /* Clear Session Request */
182 gotgctl = DWC2_READ_4(hsotg, GOTGCTL);
183 gotgctl &= ~GOTGCTL_SESREQ;
184 DWC2_WRITE_4(hsotg, GOTGCTL, gotgctl);
185 }
186 }
187 }
188
189 if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) {
190 /*
191 * Print statements during the HNP interrupt handling
192 * can cause it to fail
193 */
194 gotgctl = DWC2_READ_4(hsotg, GOTGCTL);
195 /*
196 * WA for 3.00a- HW is not setting cur_mode, even sometimes
197 * this does not help
198 */
199 if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a)
200 udelay(100);
201 if (gotgctl & GOTGCTL_HSTNEGSCS) {
202 if (dwc2_is_host_mode(hsotg)) {
203 hsotg->op_state = OTG_STATE_B_HOST;
204 /*
205 * Need to disable SOF interrupt immediately.
206 * When switching from device to host, the PCD
207 * interrupt handler won't handle the interrupt
208 * if host mode is already set. The HCD
209 * interrupt handler won't get called if the
210 * HCD state is HALT. This means that the
211 * interrupt does not get handled and Linux
212 * complains loudly.
213 */
214 gintmsk = DWC2_READ_4(hsotg, GINTMSK);
215 gintmsk &= ~GINTSTS_SOF;
216 DWC2_WRITE_4(hsotg, GINTMSK, gintmsk);
217
218 /*
219 * Call callback function with spin lock
220 * released
221 */
222 spin_unlock(&hsotg->lock);
223
224 /* Initialize the Core for Host mode */
225 dwc2_hcd_start(hsotg);
226 spin_lock(&hsotg->lock);
227 hsotg->op_state = OTG_STATE_B_HOST;
228 }
229 } else {
230 gotgctl = DWC2_READ_4(hsotg, GOTGCTL);
231 gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN);
232 DWC2_WRITE_4(hsotg, GOTGCTL, gotgctl);
233 dev_dbg(hsotg->dev, "HNP Failed\n");
234 dev_err(hsotg->dev,
235 "Device Not Connected/Responding\n");
236 }
237 }
238
239 if (gotgint & GOTGINT_HST_NEG_DET) {
240 /*
241 * The disconnect interrupt is set at the same time as
242 * Host Negotiation Detected. During the mode switch all
243 * interrupts are cleared so the disconnect interrupt
244 * handler will not get executed.
245 */
246 dev_dbg(hsotg->dev,
247 " ++OTG Interrupt: Host Negotiation Detected++ (%s)\n",
248 (dwc2_is_host_mode(hsotg) ? "Host" : "Device"));
249 if (dwc2_is_device_mode(hsotg)) {
250 dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n",
251 hsotg->op_state);
252 spin_unlock(&hsotg->lock);
253 dwc2_hcd_disconnect(hsotg, false);
254 spin_lock(&hsotg->lock);
255 hsotg->op_state = OTG_STATE_A_PERIPHERAL;
256 } else {
257 /* Need to disable SOF interrupt immediately */
258 gintmsk = DWC2_READ_4(hsotg, GINTMSK);
259 gintmsk &= ~GINTSTS_SOF;
260 DWC2_WRITE_4(hsotg, GINTMSK, gintmsk);
261 spin_unlock(&hsotg->lock);
262 dwc2_hcd_start(hsotg);
263 spin_lock(&hsotg->lock);
264 hsotg->op_state = OTG_STATE_A_HOST;
265 }
266 }
267
268 if (gotgint & GOTGINT_A_DEV_TOUT_CHG)
269 dev_dbg(hsotg->dev,
270 " ++OTG Interrupt: A-Device Timeout Change++\n");
271 if (gotgint & GOTGINT_DBNCE_DONE)
272 dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n");
273
274 /* Clear GOTGINT */
275 DWC2_WRITE_4(hsotg, GOTGINT, gotgint);
276 }
277
278 /**
279 * dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status
280 * Change Interrupt
281 *
282 * @hsotg: Programming view of DWC_otg controller
283 *
284 * Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a
285 * Device to Host Mode transition or a Host to Device Mode transition. This only
286 * occurs when the cable is connected/removed from the PHY connector.
287 */
dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg * hsotg)288 static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
289 {
290 u32 gintmsk;
291
292 /* Clear interrupt */
293 DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_CONIDSTSCHNG);
294
295 /* Need to disable SOF interrupt immediately */
296 gintmsk = DWC2_READ_4(hsotg, GINTMSK);
297 gintmsk &= ~GINTSTS_SOF;
298 DWC2_WRITE_4(hsotg, GINTMSK, gintmsk);
299
300 dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++ (%s)\n",
301 dwc2_is_host_mode(hsotg) ? "Host" : "Device");
302
303 /*
304 * Need to schedule a work, as there are possible DELAY function calls.
305 * Release lock before scheduling workq as it holds spinlock during
306 * scheduling.
307 */
308 if (hsotg->wq_otg) {
309 spin_unlock(&hsotg->lock);
310 queue_work(hsotg->wq_otg, &hsotg->wf_otg);
311 spin_lock(&hsotg->lock);
312 }
313 }
314
315 /**
316 * dwc2_handle_session_req_intr() - This interrupt indicates that a device is
317 * initiating the Session Request Protocol to request the host to turn on bus
318 * power so a new session can begin
319 *
320 * @hsotg: Programming view of DWC_otg controller
321 *
322 * This handler responds by turning on bus power. If the DWC_otg controller is
323 * in low power mode, this handler brings the controller out of low power mode
324 * before turning on bus power.
325 */
dwc2_handle_session_req_intr(struct dwc2_hsotg * hsotg)326 static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
327 {
328 int ret;
329
330 /* Clear interrupt */
331 DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_SESSREQINT);
332
333 dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",
334 hsotg->lx_state);
335
336 if (dwc2_is_device_mode(hsotg)) {
337 if (hsotg->lx_state == DWC2_L2) {
338 ret = dwc2_exit_hibernation(hsotg, true);
339 if (ret && (ret != -ENOTSUPP))
340 dev_err(hsotg->dev,
341 "exit hibernation failed\n");
342 }
343
344 /*
345 * Report disconnect if there is any previous session
346 * established
347 */
348 dwc2_hsotg_disconnect(hsotg);
349 }
350 }
351
352 /*
353 * This interrupt indicates that the DWC_otg controller has detected a
354 * resume or remote wakeup sequence. If the DWC_otg controller is in
355 * low power mode, the handler must brings the controller out of low
356 * power mode. The controller automatically begins resume signaling.
357 * The handler schedules a time to stop resume signaling.
358 */
dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg * hsotg)359 static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
360 {
361 int ret;
362
363 /* Clear interrupt */
364 DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_WKUPINT);
365
366 dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
367 dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
368
369 if (dwc2_is_device_mode(hsotg)) {
370 dev_dbg(hsotg->dev, "DSTS=0x%0x\n", DWC2_READ_4(hsotg, DSTS));
371 if (hsotg->lx_state == DWC2_L2) {
372 u32 dctl = DWC2_READ_4(hsotg, DCTL);
373
374 /* Clear Remote Wakeup Signaling */
375 dctl &= ~DCTL_RMTWKUPSIG;
376 DWC2_WRITE_4(hsotg, DCTL, dctl);
377 ret = dwc2_exit_hibernation(hsotg, true);
378 if (ret && (ret != -ENOTSUPP))
379 dev_err(hsotg->dev, "exit hibernation failed\n");
380
381 call_gadget(hsotg, resume);
382 }
383 /* Change to L0 state */
384 hsotg->lx_state = DWC2_L0;
385 } else {
386 if (hsotg->core_params->hibernation)
387 return;
388
389 if (hsotg->lx_state != DWC2_L1) {
390 u32 pcgcctl = DWC2_READ_4(hsotg, PCGCTL);
391
392 /* Restart the Phy Clock */
393 pcgcctl &= ~PCGCTL_STOPPCLK;
394 DWC2_WRITE_4(hsotg, PCGCTL, pcgcctl);
395 callout_reset(&hsotg->wkp_timer, mstohz(71),
396 dwc2_wakeup_detected, hsotg);
397 } else {
398 /* Change to L0 state */
399 hsotg->lx_state = DWC2_L0;
400 }
401 }
402 }
403
404 /*
405 * This interrupt indicates that a device has been disconnected from the
406 * root port
407 */
dwc2_handle_disconnect_intr(struct dwc2_hsotg * hsotg)408 static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
409 {
410 DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_DISCONNINT);
411
412 dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
413 dwc2_is_host_mode(hsotg) ? "Host" : "Device",
414 dwc2_op_state_str(hsotg));
415
416 if (hsotg->op_state == OTG_STATE_A_HOST)
417 dwc2_hcd_disconnect(hsotg, false);
418 }
419
420 /*
421 * This interrupt indicates that SUSPEND state has been detected on the USB.
422 *
423 * For HNP the USB Suspend interrupt signals the change from "a_peripheral"
424 * to "a_host".
425 *
426 * When power management is enabled the core will be put in low power mode.
427 */
dwc2_handle_usb_suspend_intr(struct dwc2_hsotg * hsotg)428 static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
429 {
430 u32 dsts;
431 int ret;
432
433 /* Clear interrupt */
434 DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_USBSUSP);
435
436 dev_dbg(hsotg->dev, "USB SUSPEND\n");
437
438 if (dwc2_is_device_mode(hsotg)) {
439 /*
440 * Check the Device status register to determine if the Suspend
441 * state is active
442 */
443 dsts = DWC2_READ_4(hsotg, DSTS);
444 dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts);
445 dev_dbg(hsotg->dev,
446 "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n",
447 !!(dsts & DSTS_SUSPSTS),
448 hsotg->hw_params.power_optimized);
449 if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) {
450 /* Ignore suspend request before enumeration */
451 if (!dwc2_is_device_connected(hsotg)) {
452 dev_dbg(hsotg->dev,
453 "ignore suspend request before enumeration\n");
454 return;
455 }
456
457 ret = dwc2_enter_hibernation(hsotg);
458 if (ret) {
459 if (ret != -ENOTSUPP)
460 dev_err(hsotg->dev,
461 "enter hibernation failed\n");
462 goto skip_power_saving;
463 }
464
465 udelay(100);
466
467 /* Ask phy to be suspended */
468 if (!IS_ERR_OR_NULL(hsotg->uphy))
469 usb_phy_set_suspend(hsotg->uphy, true);
470 skip_power_saving:
471 /*
472 * Change to L2 (suspend) state before releasing
473 * spinlock
474 */
475 hsotg->lx_state = DWC2_L2;
476
477 /* Call gadget suspend callback */
478 call_gadget(hsotg, suspend);
479 }
480 } else {
481 if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
482 dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
483
484 /* Change to L2 (suspend) state */
485 hsotg->lx_state = DWC2_L2;
486 /* Clear the a_peripheral flag, back to a_host */
487 spin_unlock(&hsotg->lock);
488 dwc2_hcd_start(hsotg);
489 spin_lock(&hsotg->lock);
490 hsotg->op_state = OTG_STATE_A_HOST;
491 }
492 }
493 }
494
495 #define GINTMSK_COMMON (GINTSTS_WKUPINT | GINTSTS_SESSREQINT | \
496 GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT | \
497 GINTSTS_MODEMIS | GINTSTS_DISCONNINT | \
498 GINTSTS_USBSUSP | GINTSTS_PRTINT)
499
500 /*
501 * This function returns the Core Interrupt register
502 */
dwc2_read_common_intr(struct dwc2_hsotg * hsotg)503 static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
504 {
505 u32 gintsts;
506 u32 gintmsk;
507 u32 gahbcfg;
508 u32 gintmsk_common = GINTMSK_COMMON;
509
510 gintsts = DWC2_READ_4(hsotg, GINTSTS);
511 gintmsk = DWC2_READ_4(hsotg, GINTMSK);
512 gahbcfg = DWC2_READ_4(hsotg, GAHBCFG);
513
514 /* If any common interrupts set */
515 if (gintsts & gintmsk_common)
516 dev_dbg(hsotg->dev, "gintsts=%08x gintmsk=%08x\n",
517 gintsts, gintmsk);
518
519 if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
520 return gintsts & gintmsk & gintmsk_common;
521 else
522 return 0;
523 }
524
525 /*
526 * Common interrupt handler
527 *
528 * The common interrupts are those that occur in both Host and Device mode.
529 * This handler handles the following interrupts:
530 * - Mode Mismatch Interrupt
531 * - OTG Interrupt
532 * - Connector ID Status Change Interrupt
533 * - Disconnect Interrupt
534 * - Session Request Interrupt
535 * - Resume / Remote Wakeup Detected Interrupt
536 * - Suspend Interrupt
537 */
dwc2_handle_common_intr(void * dev)538 irqreturn_t dwc2_handle_common_intr(void *dev)
539 {
540 struct dwc2_hsotg *hsotg = dev;
541 u32 gintsts;
542 irqreturn_t retval = IRQ_NONE;
543
544 if (!dwc2_is_controller_alive(hsotg)) {
545 dev_warn(hsotg->dev, "Controller is dead\n");
546 goto out;
547 }
548
549 KASSERT(mutex_owned(&hsotg->lock));
550
551 gintsts = dwc2_read_common_intr(hsotg);
552 if (gintsts & ~GINTSTS_PRTINT)
553 retval = IRQ_HANDLED;
554
555 if (gintsts & GINTSTS_MODEMIS)
556 dwc2_handle_mode_mismatch_intr(hsotg);
557 if (gintsts & GINTSTS_OTGINT)
558 dwc2_handle_otg_intr(hsotg);
559 if (gintsts & GINTSTS_CONIDSTSCHNG)
560 dwc2_handle_conn_id_status_change_intr(hsotg);
561 if (gintsts & GINTSTS_DISCONNINT)
562 dwc2_handle_disconnect_intr(hsotg);
563 if (gintsts & GINTSTS_SESSREQINT)
564 dwc2_handle_session_req_intr(hsotg);
565 if (gintsts & GINTSTS_WKUPINT)
566 dwc2_handle_wakeup_detected_intr(hsotg);
567 if (gintsts & GINTSTS_USBSUSP)
568 dwc2_handle_usb_suspend_intr(hsotg);
569
570 if (gintsts & GINTSTS_PRTINT) {
571 /*
572 * The port interrupt occurs while in device mode with HPRT0
573 * Port Enable/Disable
574 */
575 if (dwc2_is_device_mode(hsotg)) {
576 dev_dbg(hsotg->dev,
577 " --Port interrupt received in Device mode--\n");
578 dwc2_handle_usb_port_intr(hsotg);
579 retval = IRQ_HANDLED;
580 }
581 }
582
583 out:
584 return retval;
585 }
586