From: Sean Anderson sean.anderson@seco.com
Instead of using a special property to determine the reference clock period, use the rate of the reference clock. When we have a legacy snps,ref-clock-period-ns property and no reference clock, use it instead. Fractional clocks are not currently supported, and will be dealt with in the next commit.
Tested-by: Robert Hancock robert.hancock@calian.com Reviewed-by: Robert Hancock robert.hancock@calian.com Reviewed-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Signed-off-by: Sean Anderson sean.anderson@seco.com Link: https://lore.kernel.org/r/20220127200636.1456175-4-sean.anderson@seco.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/dwc3/core.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 9635c915e2f7..6ee75a72c4d8 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -355,14 +355,24 @@ static void dwc3_frame_length_adjustment(struct dwc3 *dwc) */ static void dwc3_ref_clk_period(struct dwc3 *dwc) { + unsigned long period; + unsigned long rate; u32 reg;
- if (dwc->ref_clk_per == 0) + if (dwc->ref_clk) { + rate = clk_get_rate(dwc->ref_clk); + if (!rate) + return; + period = NSEC_PER_SEC / rate; + } else if (dwc->ref_clk_per) { + period = dwc->ref_clk_per; + } else { return; + }
reg = dwc3_readl(dwc->regs, DWC3_GUCTL); reg &= ~DWC3_GUCTL_REFCLKPER_MASK; - reg |= FIELD_PREP(DWC3_GUCTL_REFCLKPER_MASK, dwc->ref_clk_per); + reg |= FIELD_PREP(DWC3_GUCTL_REFCLKPER_MASK, period); dwc3_writel(dwc->regs, DWC3_GUCTL, reg); }