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nusb/kb: work arround broken split transaction on raspi's dwc otg usb controller

--- a/sys/src/cmd/nusb/kb/hid.h

+++ b/sys/src/cmd/nusb/kb/hid.h

@@ -15,6 +15,7 @@

 	Getreport = 0x01,

 	Setreport = 0x09,

 	Getproto	= 0x03,

+	Setidle		= 0x0a,

 	Setproto	= 0x0b,

 	/* protocols for SET_PROTO request */

--- a/sys/src/cmd/nusb/kb/kb.c

+++ b/sys/src/cmd/nusb/kb/kb.c

@@ -299,12 +299,19 @@

 static int

 setproto(Hiddev *f, int eid)

 {

-	int id, proto;

+	int proto;

 	Iface *iface;

 	iface = f->dev->usb->ep[eid]->iface;

-	id = iface->id;

-	f->nrep = usbcmd(f->dev, Rd2h|Rstd|Riface, Rgetdesc, Dreport<<8, id, 

+

+	/*

+	 * DWC OTG controller misses some split transaction inputs.

+	 * Set nonzero idle time to return more frequent reports

+	 * of keyboard state, to avoid losing key up/down events.

+	 */

+	usbcmd(f->dev, Rh2d|Rclass|Riface, Setidle, 8<<8, iface->id, nil, 0);

+

+	f->nrep = usbcmd(f->dev, Rd2h|Rstd|Riface, Rgetdesc, Dreport<<8, iface->id,

 		f->rep, sizeof(f->rep));

 	if(f->nrep > 0){

 		if(debug){

@@ -335,7 +342,7 @@

 		}

 		proto = Bootproto;

 	}

-	return usbcmd(f->dev, Rh2d|Rclass|Riface, Setproto, proto, id, nil, 0);

+	return usbcmd(f->dev, Rh2d|Rclass|Riface, Setproto, proto, iface->id, nil, 0);

 }

 static int