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ps2mouse: retry disable packet streaming command 0xf5

disabling mouse packet streaming command 0xf5 can fail
when a packet is currently transmitted.

this can be seen when one moves the mouse while running:

while(){echo accelerated >/dev/mousectl; sleep 0.5}

--- a/sys/src/9/pc/mouse.c

+++ b/sys/src/9/pc/mouse.c

@@ -260,9 +260,19 @@

 static void

 setstream(int on)

 {

+	int i;

+

 	switch(mousetype){

 	case MousePS2:

-		i8042auxcmd(on ? 0xF4 : 0xF5);

+		/*

+		 * disabling streaming can fail when

+		 * a packet is currently transmitted.

+		 */

+		for(i=0; i<4; i++){

+			if(i8042auxcmd(on ? 0xF4 : 0xF5) != -1)

+				break;

+			delay(50);

+		}

 		break;

 	}

 }

-- 

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