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usbehci: portreset timing

assert port reset for 50ms, not 10ms.

--- a/sys/src/9/port/usbehci.c

+++ b/sys/src/9/port/usbehci.c

@@ -1692,19 +1692,20 @@

 			ctlr->capio);

 	*portscp = (*portscp & ~Psenable) | Psreset;	/* initiate reset */

-	delay(10);

-	*portscp &= ~Psreset;

-

 	/*

 	 * usb 2 spec: reset must finish within 20 ms.

 	 * linux says spec says it can take 50 ms. for hubs.

 	 */

+	delay(50);

+	*portscp &= ~Psreset;	/* terminate reset */

+

 	delay(10);

 	for(i = 0; *portscp & Psreset && i < 10; i++)

 		delay(10);

+

 	if (*portscp & Psreset)

-		iprint("ehci %#p: port %d didn't reset within %d ms; sts %#lux\n",

-			ctlr->capio, port, i * 10, *portscp);

+		iprint("ehci %#p: port %d didn't reset; sts %#lux\n",

+			ctlr->capio, port, *portscp);

 	delay(10);			/* ehci spec: enable within 2 ms. */

 	if((*portscp & Psenable) == 0)

-- 

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