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usb: dwc3: Calculate REFCLKPER based on reference clock

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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
This commit is contained in:
Sean Anderson 2022-11-27 15:31:54 +01:00 committed by Marek Vasut
parent 57548e8bc7
commit 6bae0eb5b8
1 changed files with 13 additions and 2 deletions
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15
drivers/usb/dwc3/core.c
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@ -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);
}