V4L/DVB (10151): Fix I2C bridge error in zl10353

Fix I2C bridge error in zl10353 if no tunner attached to internal I2C
bus of zl10353 chip.

When set enable bridge from internal I2C bus to the main I2C bus
(saa7134) the main I2C bus stopped very hardly. No any communication. In
our next board we solder additional resistors to internal I2C bus.

Signed-off-by: Beholder Intl. Ltd. Dmitry Belimov <d.belimov@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/dvb/frontends/zl10353.c b/drivers/media/dvb/frontends/zl10353.c
index 5506f80e180eeddd8c7bf575b963ea280abd3a94..170720b02815268c54b348d319d4a66d0532e454 100644 (file)
--- a/drivers/media/dvb/frontends/zl10353.c
+++ b/drivers/media/dvb/frontends/zl10353.c
@@ -587,8 +587,15 @@ static int zl10353_init(struct dvb_frontend *fe)
 
 static int zl10353_i2c_gate_ctrl(struct dvb_frontend* fe, int enable)
 {
+       struct zl10353_state *state = fe->demodulator_priv;
        u8 val = 0x0a;
 
+       if (state->config.no_tuner) {
+               /* No tuner attached to the internal I2C bus */
+               /* If set enable I2C bridge, the main I2C bus stopped hardly */
+               return 0;
+       }
+
        if (enable)
                val |= 0x10;