V4L/DVB (3405): Fixes tvp5150a/am1 detection.

- Tvp5150 type were determined by a secondary register instead of
  using ROM code.
- tvp5150am1 have ROM=4.0, while tvp5150a have ROM=3.33 (decimal).
  All other ROM versions are reported as unknown tvp5150.
- Except for reporting, current code doesn't enable any special feature
  for tvp5150am1 or tvp5150a. Code should work for both models (but were
  tested only for tvp5150am1).
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/tvp5150.c

@@ -746,24 +746,27 @@ static int tvp5150_set_std(struct i2c_client *c, v4l2_std_id std)
 
 static inline void tvp5150_reset(struct i2c_client *c)
 {
-	u8 type, ver_656, msb_id, lsb_id, msb_rom, lsb_rom;
+	u8 msb_id, lsb_id, msb_rom, lsb_rom;
 	struct tvp5150 *decoder = i2c_get_clientdata(c);
 
-	type=tvp5150_read(c,TVP5150_AUTOSW_MSK);
 	msb_id=tvp5150_read(c,TVP5150_MSB_DEV_ID);
 	lsb_id=tvp5150_read(c,TVP5150_LSB_DEV_ID);
 	msb_rom=tvp5150_read(c,TVP5150_ROM_MAJOR_VER);
 	lsb_rom=tvp5150_read(c,TVP5150_ROM_MINOR_VER);
 
-	if (type==0xdc) {
-		ver_656=tvp5150_read(c,TVP5150_REV_SELECT);
-		tvp5150_info("tvp%02x%02xam1 detected 656 version is %d.\n",msb_id, lsb_id,ver_656);
-	} else if (type==0xfc) {
+	if ((msb_rom==4)&&(lsb_rom==0)) { /* Is TVP5150AM1 */
+		tvp5150_info("tvp%02x%02xam1 detected.\n",msb_id, lsb_id);
+
+		/* ITU-T BT.656.4 timing */
+		tvp5150_write(c,TVP5150_REV_SELECT,0);
+	} else {
+		if ((msb_rom==3)||(lsb_rom==0x21)) { /* Is TVP5150A */
 			tvp5150_info("tvp%02x%02xa detected.\n",msb_id, lsb_id);
 		} else {
-		tvp5150_info("unknown tvp%02x%02x chip detected(%d).\n",msb_id,lsb_id,type);
+			tvp5150_info("*** unknown tvp%02x%02x chip detected.\n",msb_id,lsb_id);
+			tvp5150_info("*** Rom ver is %d.%d\n",msb_rom,lsb_rom);
+		}
 	}
-	tvp5150_info("Rom ver is %d.%d\n",msb_rom,lsb_rom);
 
 	/* Initializes TVP5150 to its default values */
 	tvp5150_write_inittab(c, tvp5150_init_default);