media: tvp5150: fix standard autodetection

Make sure to not overwrite decoder->norm when setting the standard
in hardware, but only when instructed by V4L2 API calls.
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

drivers/media/i2c/tvp5150.c

@@ -736,8 +736,6 @@ static int tvp5150_set_std(struct v4l2_subdev *sd, v4l2_std_id std)
 	struct tvp5150 *decoder = to_tvp5150(sd);
 	int fmt = 0;
 
-	decoder->norm = std;
-
 	/* First tests should be against specific std */
 
 	if (std == V4L2_STD_NTSC_443) {
@@ -774,13 +772,37 @@ static int tvp5150_s_std(struct v4l2_subdev *sd, v4l2_std_id std)
 	else
 		decoder->rect.height = TVP5150_V_MAX_OTHERS;
 
+	decoder->norm = std;
 
 	return tvp5150_set_std(sd, std);
 }
 
+static v4l2_std_id tvp5150_read_std(struct v4l2_subdev *sd)
+{
+	int val = tvp5150_read(sd, TVP5150_STATUS_REG_5);
+
+	switch (val & 0x0F) {
+	case 0x01:
+		return V4L2_STD_NTSC;
+	case 0x03:
+		return V4L2_STD_PAL;
+	case 0x05:
+		return V4L2_STD_PAL_M;
+	case 0x07:
+		return V4L2_STD_PAL_N | V4L2_STD_PAL_Nc;
+	case 0x09:
+		return V4L2_STD_NTSC_443;
+	case 0xb:
+		return V4L2_STD_SECAM;
+	default:
+		return V4L2_STD_UNKNOWN;
+	}
+}
+
 static int tvp5150_reset(struct v4l2_subdev *sd, u32 val)
 {
 	struct tvp5150 *decoder = to_tvp5150(sd);
+	v4l2_std_id std;
 
 	/* Initializes TVP5150 to its default values */
 	tvp5150_write_inittab(sd, tvp5150_init_default);
@@ -797,7 +819,13 @@ static int tvp5150_reset(struct v4l2_subdev *sd, u32 val)
 	/* Initialize image preferences */
 	v4l2_ctrl_handler_setup(&decoder->hdl);
 
-	tvp5150_set_std(sd, decoder->norm);
+	if (decoder->norm == V4L2_STD_ALL)
+		std = tvp5150_read_std(sd);
+	else
+		std = decoder->norm;
+
+	/* Disable autoswitch mode */
+	tvp5150_set_std(sd, std);
 
 	if (decoder->mbus_type == V4L2_MBUS_PARALLEL)
 		/* 8-bit 4:2:2 YUV with discrete sync output */
@@ -834,28 +862,6 @@ static int tvp5150_s_ctrl(struct v4l2_ctrl *ctrl)
 	return -EINVAL;
 }
 
-static v4l2_std_id tvp5150_read_std(struct v4l2_subdev *sd)
-{
-	int val = tvp5150_read(sd, TVP5150_STATUS_REG_5);
-
-	switch (val & 0x0F) {
-	case 0x01:
-		return V4L2_STD_NTSC;
-	case 0x03:
-		return V4L2_STD_PAL;
-	case 0x05:
-		return V4L2_STD_PAL_M;
-	case 0x07:
-		return V4L2_STD_PAL_N | V4L2_STD_PAL_Nc;
-	case 0x09:
-		return V4L2_STD_NTSC_443;
-	case 0xb:
-		return V4L2_STD_SECAM;
-	default:
-		return V4L2_STD_UNKNOWN;
-	}
-}
-
 static void tvp5150_set_default(v4l2_std_id std, struct v4l2_rect *crop)
 {
 	/* Default is no cropping */