/*
* This interrupt indicates that the DWC_otg controller has detected a
* resume or remote wakeup sequence. If the DWC_otg controller is in
* low power mode, the handler must brings the controller out of low
* power mode. The controller automatically begins resume signaling.
* The handler schedules a time to stop resume signaling.
*/
static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
{
int ret;
dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
if (dwc2_is_device_mode(hsotg)) {
dev_dbg(hsotg->dev, "DSTS=0x%0x\n", DWC2_READ_4(hsotg, DSTS));
if (hsotg->lx_state == DWC2_L2) {
u32 dctl = DWC2_READ_4(hsotg, DCTL);
/* Clear Remote Wakeup Signaling */
dctl &= ~DCTL_RMTWKUPSIG;
DWC2_WRITE_4(hsotg, DCTL, dctl);
ret = dwc2_exit_hibernation(hsotg, true);
if (ret && (ret != -ENOTSUPP))
dev_err(hsotg->dev, "exit hibernation failed\n");
call_gadget(hsotg, resume);
}
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
} else {
if (hsotg->lx_state != DWC2_L1) {
u32 pcgcctl = DWC2_READ_4(hsotg, PCGCTL);
/* Restart the Phy Clock */
pcgcctl &= ~PCGCTL_STOPPCLK;
DWC2_WRITE_4(hsotg, PCGCTL, pcgcctl);
callout_reset(&hsotg->wkp_timer, mstohz(71),
dwc2_wakeup_detected, hsotg);
} else {
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
}
}
/* Clear interrupt */
DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_WKUPINT);
}
/*
* This interrupt indicates that the DWC_otg controller has detected a
* resume or remote wakeup sequence. If the DWC_otg controller is in
* low power mode, the handler must brings the controller out of low
* power mode. The controller automatically begins resume signaling.
* The handler schedules a time to stop resume signaling.
*/
static void dwc2_handle_wakeup_detected_intr(struct dwc2_hsotg *hsotg)
{
int ret;
dev_dbg(hsotg->dev, "++Resume or Remote Wakeup Detected Interrupt++\n");
dev_dbg(hsotg->dev, "%s lxstate = %d\n", __func__, hsotg->lx_state);
if (dwc2_is_device_mode(hsotg)) {
dev_dbg(hsotg->dev, "DSTS=0x%0x\n", readl(hsotg->regs + DSTS));
if (hsotg->lx_state == DWC2_L2) {
u32 dctl = readl(hsotg->regs + DCTL);
/* Clear Remote Wakeup Signaling */
dctl &= ~DCTL_RMTWKUPSIG;
writel(dctl, hsotg->regs + DCTL);
ret = dwc2_exit_hibernation(hsotg, true);
if (ret && (ret != -ENOTSUPP))
dev_err(hsotg->dev, "exit hibernation failed\n");
call_gadget(hsotg, resume);
}
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
} else {
if (hsotg->lx_state != DWC2_L1) {
u32 pcgcctl = readl(hsotg->regs + PCGCTL);
/* Restart the Phy Clock */
pcgcctl &= ~PCGCTL_STOPPCLK;
writel(pcgcctl, hsotg->regs + PCGCTL);
mod_timer(&hsotg->wkp_timer,
jiffies + msecs_to_jiffies(71));
} else {
/* Change to L0 state */
hsotg->lx_state = DWC2_L0;
}
}
/* Clear interrupt */
writel(GINTSTS_WKUPINT, hsotg->regs + GINTSTS);
}
/*
* This interrupt indicates that SUSPEND state has been detected on the USB.
*
* For HNP the USB Suspend interrupt signals the change from "a_peripheral"
* to "a_host".
*
* When power management is enabled the core will be put in low power mode.
*/
static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
{
u32 dsts;
int ret;
dev_dbg(hsotg->dev, "USB SUSPEND\n");
if (dwc2_is_device_mode(hsotg)) {
/*
* Check the Device status register to determine if the Suspend
* state is active
*/
dsts = DWC2_READ_4(hsotg, DSTS);
dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts);
dev_dbg(hsotg->dev,
"DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n",
!!(dsts & DSTS_SUSPSTS),
hsotg->hw_params.power_optimized);
if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) {
/* Ignore suspend request before enumeration */
if (!dwc2_is_device_connected(hsotg)) {
dev_dbg(hsotg->dev,
"ignore suspend request before enumeration\n");
goto clear_int;
}
ret = dwc2_enter_hibernation(hsotg);
if (ret) {
if (ret != -ENOTSUPP)
dev_err(hsotg->dev,
"enter hibernation failed\n");
goto skip_power_saving;
}
udelay(100);
/* Ask phy to be suspended */
if (!IS_ERR_OR_NULL(hsotg->uphy))
usb_phy_set_suspend(hsotg->uphy, true);
skip_power_saving:
/*
* Change to L2 (suspend) state before releasing
* spinlock
*/
hsotg->lx_state = DWC2_L2;
/* Call gadget suspend callback */
call_gadget(hsotg, suspend);
}
} else {
if (hsotg->op_state == OTG_STATE_A_PERIPHERAL) {
dev_dbg(hsotg->dev, "a_peripheral->a_host\n");
/* Change to L2 (suspend) state */
hsotg->lx_state = DWC2_L2;
/* Clear the a_peripheral flag, back to a_host */
spin_unlock(&hsotg->lock);
dwc2_hcd_start(hsotg);
spin_lock(&hsotg->lock);
hsotg->op_state = OTG_STATE_A_HOST;
}
}
clear_int:
/* Clear interrupt */
DWC2_WRITE_4(hsotg, GINTSTS, GINTSTS_USBSUSP);
}
