V4L/DVB (4688): Fix msp343xG handling (regression from 2.6.16)

The msp3430G and msp3435G models cannot do Automatic Standard Detection.
So these should be forced to BTSC. These chips are early production versions
for the msp34xxG series and are quite rare.
The workaround for kernel 2.6.18 is to use 'standard=32' as msp3400
module option. Due to broken handling of the 'standard' option in 2.6.17 there is
no workaround possible for that kernel.
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/msp3400-driver.c

@@ -904,6 +904,8 @@ static int msp_attach(struct i2c_adapter *adapter, int address, int kind)
 	state->has_virtual_dolby_surround = msp_revision == 'G' && msp_prod_lo == 1;
 	/* Has Virtual Dolby Surround & Dolby Pro Logic: only in msp34x2 */
 	state->has_dolby_pro_logic = msp_revision == 'G' && msp_prod_lo == 2;
+	/* The msp343xG supports BTSC only and cannot do Automatic Standard Detection. */
+	state->force_btsc = msp_family == 3 && msp_revision == 'G' && msp_prod_hi == 3;
 
 	state->opmode = opmode;
 	if (state->opmode == OPMODE_AUTO) {

drivers/media/video/msp3400-driver.h

@@ -64,6 +64,7 @@ struct msp_state {
 	u8 has_sound_processing;
 	u8 has_virtual_dolby_surround;
 	u8 has_dolby_pro_logic;
+	u8 force_btsc;
 
 	int radio;
 	int opmode;

drivers/media/video/msp3400-kthreads.c

@@ -960,9 +960,10 @@ int msp34xxg_thread(void *data)
 
 		/* setup the chip*/
 		msp34xxg_reset(client);
-		state->std = state->radio ? 0x40 : msp_standard;
-		/* start autodetect */
+		state->std = state->radio ? 0x40 :
+			(state->force_btsc && msp_standard == 1) ? 32 : msp_standard;
 		msp_write_dem(client, 0x20, state->std);
+		/* start autodetect */
 		if (state->std != 1)
 			goto unmute;