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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: Felipe Balbi <felipe.balbi@linux.intel.com>
hifive-unleashed-5.1
Felipe Balbi 2017-06-05 17:01:22 +03:00
parent 9b0a1f95c4
commit e0082698b6
1 changed files with 12 additions and 0 deletions
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12
drivers/usb/dwc3/ulpi.c
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@ -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);