media: rc: decoders do not need to check for transitions

Drivers should never produce consecutive pulse or space raw events. Should
that occur, we would have bigger problems than this code is trying to
guard against.

Note that we already log an error should a driver misbehave.
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/rc/ir-mce_kbd-decoder.c

@@ -274,9 +274,6 @@ static int ir_mce_kbd_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		return 0;
 
 	case STATE_HEADER_BIT_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev))
-			break;
-
 		decrease_duration(&ev, MCIR2_BIT_END);
 
 		if (data->count != MCIR2_HEADER_NBITS) {
@@ -313,9 +310,6 @@ static int ir_mce_kbd_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		return 0;
 
 	case STATE_BODY_BIT_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev))
-			break;
-
 		if (data->count == data->wanted_bits)
 			data->state = STATE_FINISHED;
 		else

drivers/media/rc/ir-rc5-decoder.c

@@ -88,9 +88,6 @@ static int ir_rc5_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		return 0;
 
 	case STATE_BIT_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev))
-			break;
-
 		if (data->count == CHECK_RC5X_NBITS)
 			data->state = STATE_CHECK_RC5X;
 		else

drivers/media/rc/ir-rc6-decoder.c

@@ -145,9 +145,6 @@ static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		return 0;
 
 	case STATE_HEADER_BIT_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev))
-			break;
-
 		if (data->count == RC6_HEADER_NBITS)
 			data->state = STATE_TOGGLE_START;
 		else
@@ -165,10 +162,6 @@ static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		return 0;
 
 	case STATE_TOGGLE_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev) ||
-		    !geq_margin(ev.duration, RC6_TOGGLE_END, RC6_UNIT / 2))
-			break;
-
 		if (!(data->header & RC6_STARTBIT_MASK)) {
 			dev_dbg(&dev->dev, "RC6 invalid start bit\n");
 			break;
@@ -210,9 +203,6 @@ static int ir_rc6_decode(struct rc_dev *dev, struct ir_raw_event ev)
 		break;
 
 	case STATE_BODY_BIT_END:
-		if (!is_transition(&ev, &dev->raw->prev_ev))
-			break;
-
 		if (data->count == data->wanted_bits)
 			data->state = STATE_FINISHED;
 		else