[media] drxk: Allow to disable I2C Bridge control switch

On em28xx, tda18271C2 is accessible when the i2c port
is not touched. Touching on it breaks the driver.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/dvb/frontends/drxk.h

@@ -7,6 +7,7 @@
 struct drxk_config {
 	u8 adr;
 	u32 single_master : 1;
+	u32 no_i2c_bridge : 1;
 	const char *microcode_name;
 };
 

drivers/media/dvb/frontends/drxk_hard.c

@@ -2784,6 +2784,8 @@ static int ConfigureI2CBridge(struct drxk_state *state, bool bEnableBridge)
 	if (state->m_DrxkState == DRXK_POWERED_DOWN)
 		return -1;
 
+	if (state->no_i2c_bridge)
+		return 0;
 	do {
 		status = write16(state, SIO_HI_RA_RAM_PAR_1__A, SIO_HI_RA_RAM_PAR_1_PAR1_SEC_KEY);
 		if (status < 0)
@@ -6360,6 +6362,7 @@ struct dvb_frontend *drxk_attach(const struct drxk_config *config,
 	state->demod_address = adr;
 	state->single_master = config->single_master;
 	state->microcode_name = config->microcode_name;
+	state->no_i2c_bridge = config->no_i2c_bridge;
 
 	mutex_init(&state->mutex);
 	mutex_init(&state->ctlock);

drivers/media/dvb/frontends/drxk_hard.h

@@ -330,6 +330,7 @@ struct drxk_state {
 	/* Configurable parameters at the driver */
 
 	u32 single_master : 1;		/* Use single master i2c mode */
+	u32 no_i2c_bridge : 1;		/* Tuner is not on port 1, don't use I2C bridge */
 	const char *microcode_name;
 
 };

drivers/media/video/em28xx/em28xx-dvb.c

@@ -304,6 +304,7 @@ static struct drxd_config em28xx_drxd = {
 struct drxk_config terratec_h5_drxk = {
 	.adr = 0x29,
 	.single_master = 1,
+	.no_i2c_bridge = 1,
 	.microcode_name = "terratec_h5.fw",
 };