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Commit e0082698 authored by Felipe Balbi's avatar Felipe Balbi
Browse files

usb: dwc3: ulpi: conditionally resume ULPI PHY 



If PHY is suspended by the time we want to issue ULPI transfers, we
will observe timeouts on the ULPI interface. In order to avoid such
issue, let's make sure PHY is resumed before issuing a ULPI transfer.

Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent 9b0a1f95

drivers/usb/dwc3/ulpi.c

+12 −0
Original line number Diff line number Diff line
@@ -41,6 +41,12 @@ static int dwc3_ulpi_read(struct device *dev, u8 addr) 
	u32 reg;

	int ret;



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

	if (reg & DWC3_GUSB2PHYCFG_SUSPHY) {

		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;

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

	}



	reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);

	dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);
@@ -58,6 +64,12 @@ static int dwc3_ulpi_write(struct device *dev, u8 addr, u8 val) 
	struct dwc3 *dwc = dev_get_drvdata(dev);

	u32 reg;



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

	if (reg & DWC3_GUSB2PHYCFG_SUSPHY) {

		reg &= ~DWC3_GUSB2PHYCFG_SUSPHY;

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

	}



	reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);

	reg |= DWC3_GUSB2PHYACC_WRITE | val;

	dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);