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 <sevaka@xxxxxxxxxxxx>
---
drivers/usb/dwc2/core_intr.c | 60 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 60 insertions(+)
diff --git a/drivers/usb/dwc2/core_intr.c b/drivers/usb/dwc2/core_intr.c
index c7dd764fbfa9..663d56a293af 100644
--- a/drivers/usb/dwc2/core_intr.c
+++ b/drivers/usb/dwc2/core_intr.c
@@ -527,6 +527,64 @@ static void dwc2_handle_usb_suspend_intr(struct dwc2_hsotg *hsotg)
}
}
+/**
+ * dwc2_handle_lpm_intr - GINTSTS_LPMTRANRCVD Interrupt handler
+ */
+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_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 | \
@@ -601,6 +659,8 @@ 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) {
/*
--
2.11.0
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
