From bcb128777af5e93a0ef017e2416e12cebae715f9 Mon Sep 17 00:00:00 2001 From: Manu Gautam Date: Wed, 9 May 2018 23:09:21 +0530 Subject: [PATCH] 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: Manu Gautam Signed-off-by: Felipe Balbi --- drivers/usb/dwc3/core.c | 36 +++++++++++++++++++++++++++++++++--- 1 file changed, 33 insertions(+), 3 deletions(-) diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index a15648d25e30..449a0982111b 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -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: @@ -1403,9 +1404,25 @@ 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 */ @@ -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 */