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.
[ marek: Ported from Linux kernel commit 5114c3ee24875 ("usb: dwc3: Calculate REFCLKPER based on reference clock") ]
Reviewed-by: Sean Anderson seanga2@gmail.com Signed-off-by: Sean Anderson sean.anderson@seco.com Signed-off-by: Marek Vasut marex@denx.de # Port from Linux --- Cc: Angus Ainslie angus@akkea.ca Cc: Bin Meng bmeng.cn@gmail.com Cc: Fabio Estevam festevam@gmail.com Cc: Kunihiko Hayashi hayashi.kunihiko@socionext.com Cc: Michal Simek michal.simek@xilinx.com Cc: Peng Fan peng.fan@nxp.com Cc: Sean Anderson sean.anderson@seco.com Cc: Stefano Babic sbabic@denx.de --- V2: No change --- 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 300450100c9..cf66976a088 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -126,14 +126,24 @@ static void dwc3_frame_length_adjustment(struct dwc3 *dwc, u32 fladj) */ 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); }