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| author | Sean Anderson <sean.anderson@seco.com> | 2022-11-27 15:31:54 +0100 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2022-11-27 15:34:56 +0100 |
| commit | 6bae0eb5b8bd7f7f87c7bf106acea869da187b66 (patch) | |
| tree | 60ee4b7eea11f7298ea16e109ee83ac9c13c7ff3 /drivers | |
| parent | 57548e8bc7cb6eb1c1a0206579c2a84737a70650 (diff) | |
| download | u-boot-6bae0eb5b8bd7f7f87c7bf106acea869da187b66.tar.gz u-boot-6bae0eb5b8bd7f7f87c7bf106acea869da187b66.tar.bz2 u-boot-6bae0eb5b8bd7f7f87c7bf106acea869da187b66.zip | |
usb: dwc3: Calculate REFCLKPER based on reference clock
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
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/dwc3/core.c | 15 |
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index 300450100c..ed5d0d16f7 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -14,6 +14,7 @@ */ #include <common.h> +#include <clk.h> #include <cpu_func.h> #include <malloc.h> #include <dwc3-uboot.h> @@ -126,14 +127,24 @@ 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); } |