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nusb/usbd: use longer reset delay for rootports

Make reset delays more conservative:

The usb spec says root ports need 50ms reset minimum, use 100ms.
The usb spec says hub ports need 20ms minimum, use 50ms.

--- a/sys/src/cmd/nusb/usbd/dat.h

+++ b/sys/src/cmd/nusb/usbd/dat.h

@@ -56,8 +56,9 @@

 	Pconfigured,

 	/* Delays, timeouts (ms) */

-	Resetdelay	= 20,		/* how much to wait after a reset */

-	Resumedelay	= 20,		/* how much to wait after a resume */

+	Rootresetdelay	= 100,		/* how much to wait after a root port reset (50ms by standard) */

+	Portresetdelay	= 50,		/* how much to wait after a hub port reset (20ms by standard) */

+	Resumedelay	= 50,		/* how much to wait after a resume (20ms by standard) */

 	Powerdelay	= 100,		/* after powering up ports */

 	Pollms		= 250, 		/* port poll interval */

--- a/sys/src/cmd/nusb/usbd/hub.c

+++ b/sys/src/cmd/nusb/usbd/hub.c

@@ -452,7 +452,7 @@

 			dprint(2, "%s: %s: port %d: set reset: %r\n", argv0, d->dir, p);

 			return -1;

 		}

-		sleep(Resetdelay);

+		sleep(d->depth<0? Rootresetdelay: Portresetdelay);

 		if((sts = portstatus(h, p)) == -1)

 			return -1;

 		sp = "full";

-- 

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