drop ps2 movement packets during host commands

We were running into an issue where during boot
the host would probe the ps2 mouse with magic knock.
But the ps2 mouse would be sending movement packets
with a full buffer which would confuse the probe
due to returning movement packet data mixed with
host response data.
This caused  windows driver to not detect a valid ps2
mouse if the user was moving their finger
on the touchpad during boot.
This normally only impacts OS's where there is
no PCH i2c driver present and we fallback
to ps2 emulation. Such as windows setup.

Signed-off-by: Kieran Levin <ktl@frame.work>

Author: kiram9

board/hx20/ps2mouse.c

@@ -56,14 +56,15 @@ void send_movement_packet(void)
 	int max = 3;
 	int timeout = 0;
 
-
 	if (five_button_mode)
 		max = 4;
 	/* sometimes the host will get behind */
-	while (aux_buffer_available() < max && timeout++ < 25)
+	while (aux_buffer_available() < max && timeout++ < 25 &&
+			(*task_get_event_bitmap(emumouse_task_id) & PS2MOUSE_EVT_AUX_DATA) == 0) {
 		usleep(10*MSEC);
+	}
 
-	if (timeout == 25) {
+	if (timeout == 25 || (*task_get_event_bitmap(emumouse_task_id) & PS2MOUSE_EVT_AUX_DATA)) {
 		CPRINTS("PS2M Dropping");
 		/*drop mouse packet - host is too far behind */
 		return;
@@ -431,9 +432,7 @@ void mouse_interrupt_handler_task(void *p)
 		if (ec_mode_disabled == false) {
 			if (evt & PS2MOUSE_EVT_AUX_DATA) {
 				process_request(aux_data);
-			}
-
-			if  (evt & PS2MOUSE_EVT_INTERRUPT) {
+			} else if  (evt & PS2MOUSE_EVT_INTERRUPT) {
 				usleep(4*MSEC);
 				/* at the expensive of a slight additional latency
 				 * check to see if the soc has grabbed this out from under us