From d2521849d695a2c1f849611f39349faa70eed85f Mon Sep 17 00:00:00 2001 From: Sevak Arakelyan Date: Wed, 24 Jan 2018 17:42:40 +0400 Subject: [PATCH] usb: dwc2: gadget: LPM interrupt handler This interrupt indicates that an LPM transaction was received on the USB bus. After getting this interrupt we are going from L0 state to L1 state. Signed-off-by: Sevak Arakelyan Signed-off-by: Grigor Tovmasyan Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/core_intr.c | 63 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c index 6baa0c93..5ad3c9d 100644 --- a/drivers/usb/dwc2/core_intr.c +++ b/drivers/usb/dwc2/core_intr.c @@ -531,6 +531,67 @@ skip_power_saving: } } +/** + * dwc2_handle_lpm_intr - GINTSTS_LPMTRANRCVD Interrupt handler + * + * @hsotg: Programming view of DWC_otg controller + * + */ +static void dwc2_handle_lpm_intr(struct dwc2_hsotg *hsotg) +{ + u32 glpmcfg; + u32 pcgcctl; + u32 hird; + u32 hird_thres; + u32 hird_thres_en; + u32 enslpm; + + /* Clear interrupt */ + dwc2_writel(GINTSTS_LPMTRANRCVD, hsotg->regs + GINTSTS); + + glpmcfg = dwc2_readl(hsotg->regs + GLPMCFG); + + if (!(glpmcfg & GLPMCFG_LPMCAP)) { + dev_err(hsotg->dev, "Unexpected LPM interrupt\n"); + return; + } + + hird = (glpmcfg & GLPMCFG_HIRD_MASK) >> GLPMCFG_HIRD_SHIFT; + hird_thres = (glpmcfg & GLPMCFG_HIRD_THRES_MASK & + ~GLPMCFG_HIRD_THRES_EN) >> GLPMCFG_HIRD_THRES_SHIFT; + hird_thres_en = glpmcfg & GLPMCFG_HIRD_THRES_EN; + enslpm = glpmcfg & GLPMCFG_SNDLPM; + + if (dwc2_is_device_mode(hsotg)) { + dev_dbg(hsotg->dev, "HIRD_THRES_EN = %d\n", hird_thres_en); + + if (hird_thres_en && hird >= hird_thres) { + dev_dbg(hsotg->dev, "L1 with utmi_l1_suspend_n\n"); + } else if (enslpm) { + dev_dbg(hsotg->dev, "L1 with utmi_sleep_n\n"); + } else { + dev_dbg(hsotg->dev, "Entering Sleep with L1 Gating\n"); + + pcgcctl = dwc2_readl(hsotg->regs + PCGCTL); + pcgcctl |= PCGCTL_ENBL_SLEEP_GATING; + dwc2_writel(pcgcctl, hsotg->regs + PCGCTL); + } + /** + * Examine prt_sleep_sts after TL1TokenTetry period max (10 us) + */ + udelay(10); + + glpmcfg = dwc2_readl(hsotg->regs + GLPMCFG); + + if (glpmcfg & GLPMCFG_SLPSTS) { + /* Save the current state */ + hsotg->lx_state = DWC2_L1; + dev_dbg(hsotg->dev, + "Core is in L1 sleep glpmcfg=%08x\n", glpmcfg); + } + } +} + #define GINTMSK_COMMON (GINTSTS_WKUPINT | GINTSTS_SESSREQINT | \ GINTSTS_CONIDSTSCHNG | GINTSTS_OTGINT | \ GINTSTS_MODEMIS | GINTSTS_DISCONNINT | \ @@ -605,6 +666,8 @@ irqreturn_t dwc2_handle_common_intr(int irq, void *dev) dwc2_handle_wakeup_detected_intr(hsotg); if (gintsts & GINTSTS_USBSUSP) dwc2_handle_usb_suspend_intr(hsotg); + if (gintsts & GINTSTS_LPMTRANRCVD) + dwc2_handle_lpm_intr(hsotg); if (gintsts & GINTSTS_PRTINT) { /* -- 2.7.4