[PATCH] usb: kbd: dwc2: Increase wait for dwc2 controller reset by 125us

Two following performance patches applied together occasionally harm usb keyboard on RPi3.

'dwc2: use the nonblock argument in submit_int_msg' commit 9dcab2c4d2cb50ab1864c818b82a72393c160236

'console: usb: kbd: Limit poll frequency to improve performance' commit 96991e652f541323a03c5b7e075d54a117091618

This empirically increased by sub-millisecond wait for dwc2 controller reset makes keyboard reliable.

Signed-off-by: Filip Zaludek filip.zaludek@oracle.com --- drivers/usb/host/dwc2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c index 23060fc369..71b66a52ed 100644 --- a/drivers/usb/host/dwc2.c +++ b/drivers/usb/host/dwc2.c @@ -764,7 +764,7 @@ static int dwc_otg_submit_rh_msg_out(struct dwc2_priv *priv, DWC2_HPRT0_PRTENCHNG | DWC2_HPRT0_PRTOVRCURRCHNG, DWC2_HPRT0_PRTRST); - mdelay(50); + udelay(50125); clrbits_le32(&regs->hprt0, DWC2_HPRT0_PRTRST); break;