Testing on different generations of Lantiq MIPS SoC based boards, showed that it takes up to 1500 us until the core reset bit is cleared.

The driver from the vendor SDK (ifxhcd) uses a 1 second timeout. Use the same timeout to fix wrong hang detections and make the driver work for Lantiq MIPS SoCs.

At least till kernel 4.14 the hanging reset only caused a warning but the driver was probed successful. With kernel 4.19 errors out with EBUSY.

Cc: linux-stable stable@vger.kernel.org # 4.19+ Signed-off-by: Mathias Kresin dev@kresin.me --- drivers/usb/dwc2/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c index 8b499d643461..01cdd236be99 100644 --- a/drivers/usb/dwc2/core.c +++ b/drivers/usb/dwc2/core.c @@ -524,7 +524,7 @@ int dwc2_core_reset(struct dwc2_hsotg *hsotg, bool skip_wait) greset |= GRSTCTL_CSFTRST; dwc2_writel(hsotg, greset, GRSTCTL);

- if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 50)) { + if (dwc2_hsotg_wait_bit_clear(hsotg, GRSTCTL, GRSTCTL_CSFTRST, 10000)) { dev_warn(hsotg->dev, "%s: HANG! Soft Reset timeout GRSTCTL GRSTCTL_CSFTRST\n", __func__); return -EBUSY;