[media] tvaudio: don't report mono when stereo is received

The V4L2 spec says reporting mono and stereo at the same time means
the hardware can not distinguish between the two. So when we can,
we should report only one of them.
Signed-off-by: Daniel Glöckner <daniel-gl@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/tvaudio.c

@@ -383,7 +383,7 @@ static int tda9840_getmode(struct CHIPSTATE *chip)
 	if (val & TDA9840_DS_DUAL)
 		mode |= V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 	if (val & TDA9840_ST_STEREO)
-		mode |= V4L2_TUNER_SUB_STEREO;
+		mode = V4L2_TUNER_SUB_STEREO;
 
 	v4l2_dbg(1, debug, sd, "tda9840_getmode(): raw chip read: %d, return: %d\n",
 		val, mode);
@@ -541,7 +541,7 @@ static int  tda985x_getmode(struct CHIPSTATE *chip)
 	mode = V4L2_TUNER_SUB_MONO;
 	val = chip_read(chip);
 	if (val & TDA985x_STP)
-		mode |= V4L2_TUNER_SUB_STEREO;
+		mode = V4L2_TUNER_SUB_STEREO;
 	if (val & TDA985x_SAPP)
 		mode |= V4L2_TUNER_SUB_SAP;
 	return mode;
@@ -700,7 +700,7 @@ static int tda9873_getmode(struct CHIPSTATE *chip)
 	val = chip_read(chip);
 	mode = V4L2_TUNER_SUB_MONO;
 	if (val & TDA9873_STEREO)
-		mode |= V4L2_TUNER_SUB_STEREO;
+		mode = V4L2_TUNER_SUB_STEREO;
 	if (val & TDA9873_DUAL)
 		mode |= V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 	v4l2_dbg(1, debug, sd, "tda9873_getmode(): raw chip read: %d, return: %d\n",
@@ -918,12 +918,12 @@ static int tda9874a_getmode(struct CHIPSTATE *chip)
 		 * external 4052 multiplexer in audio_hook().
 		 */
 		if(nsr & 0x02) /* NSR.S/MB=1 */
-			mode |= V4L2_TUNER_SUB_STEREO;
+			mode = V4L2_TUNER_SUB_STEREO;
 		if(nsr & 0x01) /* NSR.D/SB=1 */
 			mode |= V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 	} else {
 		if(dsr & 0x02) /* DSR.IDSTE=1 */
-			mode |= V4L2_TUNER_SUB_STEREO;
+			mode = V4L2_TUNER_SUB_STEREO;
 		if(dsr & 0x04) /* DSR.IDDUA=1 */
 			mode |= V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 	}
@@ -1350,7 +1350,7 @@ static int ta8874z_getmode(struct CHIPSTATE *chip)
 	if (val & TA8874Z_B1){
 		mode |= V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
 	}else if (!(val & TA8874Z_B0)){
-		mode |= V4L2_TUNER_SUB_STEREO;
+		mode = V4L2_TUNER_SUB_STEREO;
 	}
 	/* v4l_dbg(1, debug, chip->c, "ta8874z_getmode(): raw chip read: 0x%02x, return: 0x%02x\n", val, mode); */
 	return mode;