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usb: dwc2: Allow entering hibernation from USB_SUSPEND interrupt

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Do changes to allow entering hibernated state from USB_SUSPEND
interrupt. All code is added under if conditions and mustn't impact
existing functionality.

Signed-off-by: Vardan Mikayelyan <mvardan@synopsys.com>
Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Grigor Tovmasyan <tovmasya@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Vardan Mikayelyan 2018-02-16 14:11:07 +04:00 committed by Felipe Balbi
parent 624815ce32
commit 97861781da
1 changed files with 32 additions and 20 deletions
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52
drivers/usb/dwc2/core_intr.c
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@ -484,32 +484,44 @@ static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
* state is active * state is active
*/ */
dsts = dwc2_readl(hsotg->regs + DSTS); dsts = dwc2_readl(hsotg->regs + DSTS);
dev_dbg(hsotg->dev, "DSTS=0x%0x\n", dsts); dev_dbg(hsotg->dev, "%s: DSTS=0x%0x\n", __func__, dsts);
dev_dbg(hsotg->dev, dev_dbg(hsotg->dev,
"DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d\n", "DSTS.Suspend Status=%d HWCFG4.Power Optimize=%d HWCFG4.Hibernation=%d\n",
!!(dsts & DSTS_SUSPSTS), !!(dsts & DSTS_SUSPSTS),
hsotg->hw_params.power_optimized); hsotg->hw_params.power_optimized,
if ((dsts & DSTS_SUSPSTS) && hsotg->hw_params.power_optimized) { hsotg->hw_params.hibernation);
/* Ignore suspend request before enumeration */
if (!dwc2_is_device_connected(hsotg)) { /* Ignore suspend request before enumeration */
dev_dbg(hsotg->dev, if (!dwc2_is_device_connected(hsotg)) {
"ignore suspend request before enumeration\n"); dev_dbg(hsotg->dev,
return; "ignore suspend request before enumeration\n");
return;
}
if (dsts & DSTS_SUSPSTS) {
if (hsotg->hw_params.power_optimized) {
ret = dwc2_enter_partial_power_down(hsotg);
if (ret) {
if (ret != -ENOTSUPP)
dev_err(hsotg->dev,
"%s: enter partial_power_down failed\n",
__func__);
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);
} }
ret = dwc2_enter_partial_power_down(hsotg); if (hsotg->hw_params.hibernation) {
if (ret) { ret = dwc2_enter_hibernation(hsotg, 0);
if (ret != -ENOTSUPP) if (ret && ret != -ENOTSUPP)
dev_err(hsotg->dev, dev_err(hsotg->dev,
"enter power_down failed\n"); "%s: enter hibernation failed\n",
goto skip_power_saving; __func__);
} }
udelay(100);
/* Ask phy to be suspended */
if (!IS_ERR_OR_NULL(hsotg->uphy))
usb_phy_set_suspend(hsotg->uphy, true);
skip_power_saving: skip_power_saving:
/* /*
* Change to L2 (suspend) state before releasing * Change to L2 (suspend) state before releasing