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Commit bcb12877 authored by Manu Gautam's avatar Manu Gautam Committed by Felipe Balbi
Browse files

usb: dwc3: core: Suspend PHYs on runtime suspend in host mode 



Some PHY drivers (e.g. for Qualcomm QUSB2 and QMP PHYs) support
runtime PM to reduce PHY power consumption during bus_suspend.
Add changes to let core auto-suspend PHYs on host bus-suspend
using GUSB2PHYCFG register if needed for a platform. Also perform
PHYs runtime suspend/resume and let platform glue drivers e.g.
dwc3-qcom handle remote wakeup during bus suspend by waking up
devices on receiving wakeup event from PHY.

Signed-off-by: default avatarManu Gautam <mgautam@codeaurora.org>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent a4333c3a

drivers/usb/dwc3/core.c

+33 −3
Original line number Diff line number Diff line
@@ -1394,6 +1394,7 @@ static int dwc3_remove(struct platform_device *pdev) 
static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg)

{

	unsigned long	flags;

	u32 reg;



	switch (dwc->current_dr_role) {

	case DWC3_GCTL_PRTCAP_DEVICE:
@@ -1403,10 +1404,26 @@ static int dwc3_suspend_common(struct dwc3 *dwc, pm_message_t msg) 
		dwc3_core_exit(dwc);

		break;

	case DWC3_GCTL_PRTCAP_HOST:

		/* do nothing during host runtime_suspend */

		if (!PMSG_IS_AUTO(msg))

		if (!PMSG_IS_AUTO(msg)) {

			dwc3_core_exit(dwc);

			break;

		}



		/* Let controller to suspend HSPHY before PHY driver suspends */

		if (dwc->dis_u2_susphy_quirk ||

		    dwc->dis_enblslpm_quirk) {

			reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));

			reg |=  DWC3_GUSB2PHYCFG_ENBLSLPM |

				DWC3_GUSB2PHYCFG_SUSPHY;

			dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);



			/* Give some time for USB2 PHY to suspend */

			usleep_range(5000, 6000);

		}



		phy_pm_runtime_put_sync(dwc->usb2_generic_phy);

		phy_pm_runtime_put_sync(dwc->usb3_generic_phy);

		break;

	case DWC3_GCTL_PRTCAP_OTG:

		/* do nothing during runtime_suspend */

		if (PMSG_IS_AUTO(msg))
@@ -1433,6 +1450,7 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) 
{

	unsigned long	flags;

	int		ret;

	u32		reg;



	switch (dwc->current_dr_role) {

	case DWC3_GCTL_PRTCAP_DEVICE:
@@ -1446,13 +1464,25 @@ static int dwc3_resume_common(struct dwc3 *dwc, pm_message_t msg) 
		spin_unlock_irqrestore(&dwc->lock, flags);

		break;

	case DWC3_GCTL_PRTCAP_HOST:

		/* nothing to do on host runtime_resume */

		if (!PMSG_IS_AUTO(msg)) {

			ret = dwc3_core_init(dwc);

			if (ret)

				return ret;

			dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_HOST);

			break;

		}

		/* Restore GUSB2PHYCFG bits that were modified in suspend */

		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));

		if (dwc->dis_u2_susphy_quirk)

			reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;



		if (dwc->dis_enblslpm_quirk)

			reg &= ~DWC3_GUSB2PHYCFG_ENBLSLPM;



		dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);



		phy_pm_runtime_get_sync(dwc->usb2_generic_phy);

		phy_pm_runtime_get_sync(dwc->usb3_generic_phy);

		break;

	case DWC3_GCTL_PRTCAP_OTG:

		/* nothing to do on runtime_resume */