drivers/usb/dwc2/core_intr.c

   1 /*
   2  * core_intr.c - DesignWare HS OTG Controller common interrupt handling
   3  *
   4  * Copyright (C) 2004-2013 Synopsys, Inc.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions, and the following disclaimer,
  11  *    without modification.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The names of the above-listed copyright holders may not be used
  16  *    to endorse or promote products derived from this software without
  17  *    specific prior written permission.
  18  *
  19  * ALTERNATIVELY, this software may be distributed under the terms of the
  20  * GNU General Public License ("GPL") as published by the Free Software
  21  * Foundation; either version 2 of the License, or (at your option) any
  22  * later version.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  25  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  26  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  27  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  28  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  29  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  30  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  31  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  32  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  33  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  34  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 /*
  38  * This file contains the common interrupt handlers
  39  */
  40 #include <linux/kernel.h>
  41 #include <linux/module.h>
  42 #include <linux/moduleparam.h>
  43 #include <linux/spinlock.h>
  44 #include <linux/interrupt.h>
  45 #include <linux/dma-mapping.h>
  46 #include <linux/io.h>
  47 #include <linux/slab.h>
  48 #include <linux/usb.h>
  49
  50 #include <linux/usb/hcd.h>
  51 #include <linux/usb/ch11.h>
  52
  53 #include "core.h"
  54 #include "hcd.h"
  55
  56 static const char *dwc2_op_state_str(struct dwc2_hsotg *hsotg)
  57 {
  58         switch (hsotg->op_state) {
  59         case OTG_STATE_A_HOST:
  60                 return "a_host";
  61         case OTG_STATE_A_SUSPEND:
  62                 return "a_suspend";
  63         case OTG_STATE_A_PERIPHERAL:
  64                 return "a_peripheral";
  65         case OTG_STATE_B_PERIPHERAL:
  66                 return "b_peripheral";
  67         case OTG_STATE_B_HOST:
  68                 return "b_host";
  69         default:
  70                 return "unknown";
  71         }
  72 }
  73
  74 /**
  75  * dwc2_handle_usb_port_intr - handles OTG PRTINT interrupts.
  76  * When the PRTINT interrupt fires, there are certain status bits in the Host
  77  * Port that needs to get cleared.
  78  *
  79  * @hsotg: Programming view of DWC_otg controller
  80  */
  81 static void dwc2_handle_usb_port_intr(struct dwc2_hsotg *hsotg)
  82 {
  83         u32 hprt0 = dwc2_readl(hsotg->regs + HPRT0);
  84
  85         if (hprt0 & HPRT0_ENACHG) {
  86                 hprt0 &= ~HPRT0_ENA;
  87                 dwc2_writel(hprt0, hsotg->regs + HPRT0);
  88         }
  89 }
  90
  91 /**
  92  * dwc2_handle_mode_mismatch_intr() - Logs a mode mismatch warning message
  93  *
  94  * @hsotg: Programming view of DWC_otg controller
  95  */
  96 static void dwc2_handle_mode_mismatch_intr(struct dwc2_hsotg *hsotg)
  97 {
  98         /* Clear interrupt */
  99         dwc2_writel(GINTSTS_MODEMIS, hsotg->regs + GINTSTS);
 100
 101         dev_warn(hsotg->dev, "Mode Mismatch Interrupt: currently in %s mode\n",
 102                  dwc2_is_host_mode(hsotg) ? "Host" : "Device");
 103 }
 104
 105 /**
 106  * dwc2_handle_otg_intr() - Handles the OTG Interrupts. It reads the OTG
 107  * Interrupt Register (GOTGINT) to determine what interrupt has occurred.
 108  *
 109  * @hsotg: Programming view of DWC_otg controller
 110  */
 111 static void dwc2_handle_otg_intr(struct dwc2_hsotg *hsotg)
 112 {
 113         u32 gotgint;
 114         u32 gotgctl;
 115         u32 gintmsk;
 116
 117         gotgint = dwc2_readl(hsotg->regs + GOTGINT);
 118         gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
 119         dev_dbg(hsotg->dev, "++OTG Interrupt gotgint=%0x [%s]\n", gotgint,
 120                 dwc2_op_state_str(hsotg));
 121
 122         if (gotgint & GOTGINT_SES_END_DET) {
 123                 dev_dbg(hsotg->dev,
 124                         " ++OTG Interrupt: Session End Detected++ (%s)\n",
 125                         dwc2_op_state_str(hsotg));
 126                 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
 127
 128                 if (dwc2_is_device_mode(hsotg))
 129                         dwc2_hsotg_disconnect(hsotg);
 130
 131                 if (hsotg->op_state == OTG_STATE_B_HOST) {
 132                         hsotg->op_state = OTG_STATE_B_PERIPHERAL;
 133                 } else {
 134                         /*
 135                          * If not B_HOST and Device HNP still set, HNP did
 136                          * not succeed!
 137                          */
 138                         if (gotgctl & GOTGCTL_DEVHNPEN) {
 139                                 dev_dbg(hsotg->dev, "Session End Detected\n");
 140                                 dev_err(hsotg->dev,
 141                                         "Device Not Connected/Responding!\n");
 142                         }
 143
 144                         /*
 145                          * If Session End Detected the B-Cable has been
 146                          * disconnected
 147                          */
 148                         /* Reset to a clean state */
 149                         hsotg->lx_state = DWC2_L0;
 150                 }
 151
 152                 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
 153                 gotgctl &= ~GOTGCTL_DEVHNPEN;
 154                 dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
 155         }
 156
 157         if (gotgint & GOTGINT_SES_REQ_SUC_STS_CHNG) {
 158                 dev_dbg(hsotg->dev,
 159                         " ++OTG Interrupt: Session Request Success Status Change++\n");
 160                 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
 161                 if (gotgctl & GOTGCTL_SESREQSCS) {
 162                         if (hsotg->core_params->phy_type ==
 163                                         DWC2_PHY_TYPE_PARAM_FS
 164                             && hsotg->core_params->i2c_enable > 0) {
 165                                 hsotg->srp_success = 1;
 166                         } else {
 167                                 /* Clear Session Request */
 168                                 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
 169                                 gotgctl &= ~GOTGCTL_SESREQ;
 170                                 dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
 171                         }
 172                 }
 173         }
 174
 175         if (gotgint & GOTGINT_HST_NEG_SUC_STS_CHNG) {
 176                 /*
 177                  * Print statements during the HNP interrupt handling
 178                  * can cause it to fail
 179                  */
 180                 gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
 181                 /*
 182                  * WA for 3.00a- HW is not setting cur_mode, even sometimes
 183                  * this does not help
 184                  */
 185                 if (hsotg->hw_params.snpsid >= DWC2_CORE_REV_3_00a)
 186                         udelay(100);
 187                 if (gotgctl & GOTGCTL_HSTNEGSCS) {
 188                         if (dwc2_is_host_mode(hsotg)) {
 189                                 hsotg->op_state = OTG_STATE_B_HOST;
 190                                 /*
 191                                  * Need to disable SOF interrupt immediately.
 192                                  * When switching from device to host, the PCD
 193                                  * interrupt handler won't handle the interrupt
 194                                  * if host mode is already set. The HCD
 195                                  * interrupt handler won't get called if the
 196                                  * HCD state is HALT. This means that the
 197                                  * interrupt does not get handled and Linux
 198                                  * complains loudly.
 199                                  */
 200                                 gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
 201                                 gintmsk &= ~GINTSTS_SOF;
 202                                 dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
 203
 204                                 /*
 205                                  * Call callback function with spin lock
 206                                  * released
 207                                  */
 208                                 spin_unlock(&hsotg->lock);
 209
 210                                 /* Initialize the Core for Host mode */
 211                                 dwc2_hcd_start(hsotg);
 212                                 spin_lock(&hsotg->lock);
 213                                 hsotg->op_state = OTG_STATE_B_HOST;
 214                         }
 215                 } else {
 216                         gotgctl = dwc2_readl(hsotg->regs + GOTGCTL);
 217                         gotgctl &= ~(GOTGCTL_HNPREQ | GOTGCTL_DEVHNPEN);
 218                         dwc2_writel(gotgctl, hsotg->regs + GOTGCTL);
 219                         dev_dbg(hsotg->dev, "HNP Failed\n");
 220                         dev_err(hsotg->dev,
 221                                 "Device Not Connected/Responding\n");
 222                 }
 223         }
 224
 225         if (gotgint & GOTGINT_HST_NEG_DET) {
 226                 /*
 227                  * The disconnect interrupt is set at the same time as
 228                  * Host Negotiation Detected. During the mode switch all
 229                  * interrupts are cleared so the disconnect interrupt
 230                  * handler will not get executed.
 231                  */
 232                 dev_dbg(hsotg->dev,
 233                         " ++OTG Interrupt: Host Negotiation Detected++ (%s)\n",
 234                         (dwc2_is_host_mode(hsotg) ? "Host" : "Device"));
 235                 if (dwc2_is_device_mode(hsotg)) {
 236                         dev_dbg(hsotg->dev, "a_suspend->a_peripheral (%d)\n",
 237                                 hsotg->op_state);
 238                         spin_unlock(&hsotg->lock);
 239                         dwc2_hcd_disconnect(hsotg, false);
 240                         spin_lock(&hsotg->lock);
 241                         hsotg->op_state = OTG_STATE_A_PERIPHERAL;
 242                 } else {
 243                         /* Need to disable SOF interrupt immediately */
 244                         gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
 245                         gintmsk &= ~GINTSTS_SOF;
 246                         dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
 247                         spin_unlock(&hsotg->lock);
 248                         dwc2_hcd_start(hsotg);
 249                         spin_lock(&hsotg->lock);
 250                         hsotg->op_state = OTG_STATE_A_HOST;
 251                 }
 252         }
 253
 254         if (gotgint & GOTGINT_A_DEV_TOUT_CHG)
 255                 dev_dbg(hsotg->dev,
 256                         " ++OTG Interrupt: A-Device Timeout Change++\n");
 257         if (gotgint & GOTGINT_DBNCE_DONE)
 258                 dev_dbg(hsotg->dev, " ++OTG Interrupt: Debounce Done++\n");
 259
 260         /* Clear GOTGINT */
 261         dwc2_writel(gotgint, hsotg->regs + GOTGINT);
 262 }
 263
 264 /**
 265  * dwc2_handle_conn_id_status_change_intr() - Handles the Connector ID Status
 266  * Change Interrupt
 267  *
 268  * @hsotg: Programming view of DWC_otg controller
 269  *
 270  * Reads the OTG Interrupt Register (GOTCTL) to determine whether this is a
 271  * Device to Host Mode transition or a Host to Device Mode transition. This only
 272  * occurs when the cable is connected/removed from the PHY connector.
 273  */
 274 static void dwc2_handle_conn_id_status_change_intr(struct dwc2_hsotg *hsotg)
 275 {
 276         u32 gintmsk;
 277
 278         /* Clear interrupt */
 279         dwc2_writel(GINTSTS_CONIDSTSCHNG, hsotg->regs + GINTSTS);
 280
 281         /* Need to disable SOF interrupt immediately */
 282         gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
 283         gintmsk &= ~GINTSTS_SOF;
 284         dwc2_writel(gintmsk, hsotg->regs + GINTMSK);
 285
 286         dev_dbg(hsotg->dev, " ++Connector ID Status Change Interrupt++  (%s)\n",
 287                 dwc2_is_host_mode(hsotg) ? "Host" : "Device");
 288
 289         /*
 290          * Need to schedule a work, as there are possible DELAY function calls.
 291          * Release lock before scheduling workq as it holds spinlock during
 292          * scheduling.
 293          */
 294         if (hsotg->wq_otg) {
 295                 spin_unlock(&hsotg->lock);
 296                 queue_work(hsotg->wq_otg, &hsotg->wf_otg);
 297                 spin_lock(&hsotg->lock);
 298         }
 299 }
 300
 301 /**
 302  * dwc2_handle_session_req_intr() - This interrupt indicates that a device is
 303  * initiating the Session Request Protocol to request the host to turn on bus
 304  * power so a new session can begin
 305  *
 306  * @hsotg: Programming view of DWC_otg controller
 307  *
 308  * This handler responds by turning on bus power. If the DWC_otg controller is
 309  * in low power mode, this handler brings the controller out of low power mode
 310  * before turning on bus power.
 311  */
 312 static void dwc2_handle_session_req_intr(struct dwc2_hsotg *hsotg)
 313 {
 314         int ret;
 315
 316         /* Clear interrupt */
 317         dwc2_writel(GINTSTS_SESSREQINT, hsotg->regs + GINTSTS);
 318
 319         dev_dbg(hsotg->dev, "Session request interrupt - lx_state=%d\n",
 320                                                         hsotg->lx_state);
 321
 322         if (dwc2_is_device_mode(hsotg)) {
 323                 if (hsotg->lx_state == DWC2_L2) {
 324                         ret = dwc2_exit_hibernation(hsotg, true);
 325                         if (ret && (ret != -ENOTSUPP))
 326                                 dev_err(hsotg->dev,
 327                                         "exit hibernation failed\n");
 328                 }
 329
 330                 /*
 331                  * Report disconnect if there is any previous session
 332                  * established
 333                  */
 334                 dwc2_hsotg_disconnect(hsotg);
 335         }
 336 }
 337
 338 /*
 339  * This interrupt indicates that the DWC_otg controller has detected a
 340  * resume or remote wakeup sequence. If the DWC_otg controller is in
 341  * low power mode, the handler must brings the controller out of low
 342  * power mode. The controller automatically begins resume signaling.
 343  * The handler schedules a time to stop resume signaling.
 344  */
 345 static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
 346 {
 347         int ret;
 348
 349         /* Clear interrupt */
 350         dwc2_writel(GINTSTS_WKUPINT, hsotg->regs + GINTSTS);
 351
 352         dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
 353         dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
 354
 355         if (dwc2_is_device_mode(hsotg)) {
 356                 dev_dbg(hsotg->dev, "DSTS=0x%0x\n",
 357                         dwc2_readl(hsotg->regs + DSTS));
 358                 if (hsotg->lx_state == DWC2_L2) {
 359                         u32 dctl = dwc2_readl(hsotg->regs + DCTL);
 360
 361                         /* Clear Remote Wakeup Signaling */
 362                         dctl &= ~DCTL_RMTWKUPSIG;
 363                         dwc2_writel(dctl, hsotg->regs + DCTL);
 364                         ret = dwc2_exit_hibernation(hsotg, true);
 365                         if (ret && (ret != -ENOTSUPP))
 366                                 dev_err(hsotg->dev, "exit hibernation failed\n");
 367
 368                         call_gadget(hsotg, resume);
 369                 }
 370                 /* Change to L0 state */
 371                 hsotg->lx_state = DWC2_L0;
 372         } else {
 373                 if (hsotg->core_params->hibernation)
 374                         return;
 375
 376                 if (hsotg->lx_state != DWC2_L1) {
 377                         u32 pcgcctl = dwc2_readl(hsotg->regs + PCGCTL);
 378
 379                         /* Restart the Phy Clock */
 380                         pcgcctl &= ~PCGCTL_STOPPCLK;
 381                         dwc2_writel(pcgcctl, hsotg->regs + PCGCTL);
 382                         mod_timer(&hsotg->wkp_timer,
 383                                   jiffies + msecs_to_jiffies(71));
 384                 } else {
 385                         /* Change to L0 state */
 386                         hsotg->lx_state = DWC2_L0;
 387                 }
 388         }
 389 }
 390
 391 /*
 392  * This interrupt indicates that a device has been disconnected from the
 393  * root port
 394  */
 395 static void dwc2_handle_disconnect_intr(struct dwc2_hsotg *hsotg)
 396 {
 397         dwc2_writel(GINTSTS_DISCONNINT, hsotg->regs + GINTSTS);
 398
 399         dev_dbg(hsotg->dev, "++Disconnect Detected Interrupt++ (%s) %s\n",
 400                 dwc2_is_host_mode(hsotg) ? "Host" : "Device",
 401                 dwc2_op_state_str(hsotg));
 402
 403         if (hsotg->op_state == OTG_STATE_A_HOST)
 404                 dwc2_hcd_disconnect(hsotg, false);
 405 }
 406
 407 /*
 408  * This interrupt indicates that SUSPEND state has been detected on the USB.
 409  *
 410  * For HNP the USB Suspend interrupt signals the change from "a_peripheral"
 411  * to "a_host".
 412  *
 413  * When power management is enabled the core will be put in low power mode.
 414  */
 415 static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
 416 {
 417         u32 dsts;
 418         int ret;
 419
 420         /* Clear interrupt */
 421         dwc2_writel(GINTSTS_USBSUSP, hsotg->regs + GINTSTS);
 422
 423         dev_dbg(hsotg->dev, "USB SUSPEND\n");
 424
 425         if (dwc2_is_device_mode(hsotg)) {
 426                 /*
 427                  * Check the Device status register to determine if the Suspend
 428                  * state is active
 429                  */
 430                 dsts = dwc2_readl(hsotg->regs + DSTS);
 431                 dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts);
 432                 dev_dbg(hsotg->dev,
 433                         "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n",
 434                         !!(dsts & DSTS_SUSPSTS),
 435                         hsotg->hw_params.power_optimized);
 436                 if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) {
 437                         /* Ignore suspend request before enumeration */
 438                         if (!dwc2_is_device_connected(hsotg)) {
 439                                 dev_dbg(hsotg->dev,
 440                                                 "ignore suspend request before enumeration\n");
 441                                 return;
 442                         }
 443
 444                         ret = dwc2_enter_hibernation(hsotg);
 445                         if (ret) {
 446                                 if (ret != -ENOTSUPP)
 447                                         dev_err(hsotg->dev,
 448                                                         "enter hibernation failed\n");
 449                                 goto skip_power_saving;
 450                         }
 451
 452                         udelay(100);
 453
 454                         /* Ask phy to be suspended */
 455                         if (!IS_ERR_OR_NULL(hsotg->uphy))
 456                                 usb_phy_set_suspend(hsotg->uphy, true);
 457 skip_power_saving:
 458                         /*
 459                          * Change to L2 (suspend) state before releasing
 460                          * spinlock
 461                          */
 462                         hsotg->lx_state = DWC2_L2;
 463
 464                         /* Call gadget suspend callback */
 465                         call_gadget(hsotg, suspend);
 466                 }
 467         } else {
 468                 if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
 469                         dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
 470
 471                         /* Change to L2 (suspend) state */
 472                         hsotg->lx_state = DWC2_L2;
 473                         /* Clear the a_peripheral flag, back to a_host */
 474                         spin_unlock(&hsotg->lock);
 475                         dwc2_hcd_start(hsotg);
 476                         spin_lock(&hsotg->lock);
 477                         hsotg->op_state = OTG_STATE_A_HOST;
 478                 }
 479         }
 480 }
 481
 482 #define GINTMSK_COMMON  (GINTSTS_WKUPINT | GINTSTS_SESSREQINT |         \
 483                          GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT |        \
 484                          GINTSTS_MODEMIS | GINTSTS_DISCONNINT |         \
 485                          GINTSTS_USBSUSP | GINTSTS_PRTINT)
 486
 487 /*
 488  * This function returns the Core Interrupt register
 489  */
 490 static u32 dwc2_read_common_intr(struct dwc2_hsotg *hsotg)
 491 {
 492         u32 gintsts;
 493         u32 gintmsk;
 494         u32 gahbcfg;
 495         u32 gintmsk_common = GINTMSK_COMMON;
 496
 497         gintsts = dwc2_readl(hsotg->regs + GINTSTS);
 498         gintmsk = dwc2_readl(hsotg->regs + GINTMSK);
 499         gahbcfg = dwc2_readl(hsotg->regs + GAHBCFG);
 500
 501         /* If any common interrupts set */
 502         if (gintsts & gintmsk_common)
 503                 dev_dbg(hsotg->dev, "gintsts=%08x  gintmsk=%08x\n",
 504                         gintsts, gintmsk);
 505
 506         if (gahbcfg & GAHBCFG_GLBL_INTR_EN)
 507                 return gintsts & gintmsk & gintmsk_common;
 508         else
 509                 return 0;
 510 }
 511
 512 /*
 513  * Common interrupt handler
 514  *
 515  * The common interrupts are those that occur in both Host and Device mode.
 516  * This handler handles the following interrupts:
 517  * - Mode Mismatch Interrupt
 518  * - OTG Interrupt
 519  * - Connector ID Status Change Interrupt
 520  * - Disconnect Interrupt
 521  * - Session Request Interrupt
 522  * - Resume / Remote Wakeup Detected Interrupt
 523  * - Suspend Interrupt
 524  */
 525 irqreturn_t dwc2_handle_common_intr(int irq, void *dev)
 526 {
 527         struct dwc2_hsotg *hsotg = dev;
 528         u32 gintsts;
 529         irqreturn_t retval = IRQ_NONE;
 530
 531         spin_lock(&hsotg->lock);
 532
 533         if (!dwc2_is_controller_alive(hsotg)) {
 534                 dev_warn(hsotg->dev, "Controller is dead\n");
 535                 goto out;
 536         }
 537
 538         gintsts = dwc2_read_common_intr(hsotg);
 539         if (gintsts & ~GINTSTS_PRTINT)
 540                 retval = IRQ_HANDLED;
 541
 542         if (gintsts & GINTSTS_MODEMIS)
 543                 dwc2_handle_mode_mismatch_intr(hsotg);
 544         if (gintsts & GINTSTS_OTGINT)
 545                 dwc2_handle_otg_intr(hsotg);
 546         if (gintsts & GINTSTS_CONIDSTSCHNG)
 547                 dwc2_handle_conn_id_status_change_intr(hsotg);
 548         if (gintsts & GINTSTS_DISCONNINT)
 549                 dwc2_handle_disconnect_intr(hsotg);
 550         if (gintsts & GINTSTS_SESSREQINT)
 551                 dwc2_handle_session_req_intr(hsotg);
 552         if (gintsts & GINTSTS_WKUPINT)
 553                 dwc2_handle_wakeup_detected_intr(hsotg);
 554         if (gintsts & GINTSTS_USBSUSP)
 555                 dwc2_handle_usb_suspend_intr(hsotg);
 556
 557         if (gintsts & GINTSTS_PRTINT) {
 558                 /*
 559                  * The port interrupt occurs while in device mode with HPRT0
 560                  * Port Enable/Disable
 561                  */
 562                 if (dwc2_is_device_mode(hsotg)) {
 563                         dev_dbg(hsotg->dev,
 564                                 " --Port interrupt received in Device mode--\n");
 565                         dwc2_handle_usb_port_intr(hsotg);
 566                         retval = IRQ_HANDLED;
 567                 }
 568         }
 569
 570 out:
 571         spin_unlock(&hsotg->lock);
 572         return retval;
 573 }