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usb: dwc3: Select 2.0 or 3.0 clk base on maximum_speed

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The dwc->maximum_speed is determined through the device capability and
designer's constraint through device tree binding. If none of them
applies, don't let the default coreConsultant setting in GUCTL1 to limit
the device operating speed.

Normally the default setting will not contradict the device capability
or device tree binding. This scenario was found through our internal
tests, not an actual bug in the wild.

Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/65003b0cc37c08a0d22996009f548247ad18c00c.1713308949.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thinh Nguyen 2024-04-16 23:11:20 +00:00 committed by Greg Kroah-Hartman
parent 3d1b6c9d47
commit 606c096adc
1 changed files with 7 additions and 4 deletions
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9
drivers/usb/dwc3/core.c
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@ -1320,10 +1320,13 @@ static int dwc3_core_init(struct dwc3 *dwc)
if (dwc->parkmode_disable_hs_quirk)
reg |= DWC3_GUCTL1_PARKMODE_DISABLE_HS;
if (DWC3_VER_IS_WITHIN(DWC3, 290A, ANY) &&
(dwc->maximum_speed == USB_SPEED_HIGH ||
dwc->maximum_speed == USB_SPEED_FULL))
if (DWC3_VER_IS_WITHIN(DWC3, 290A, ANY)) {
if (dwc->maximum_speed == USB_SPEED_FULL ||
dwc->maximum_speed == USB_SPEED_HIGH)
reg |= DWC3_GUCTL1_DEV_FORCE_20_CLK_FOR_30_CLK;
else
reg &= ~DWC3_GUCTL1_DEV_FORCE_20_CLK_FOR_30_CLK;
}
dwc3_writel(dwc->regs, DWC3_GUCTL1, reg);
}