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V4L/DVB (13247): tuner-core: dont force every tuner to set frequency at startup

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Setting the tuner frequency at the same time as initializing the other devices
on the i2c bus can cause problems on devices that require firmware download or
extensive calibration proceduces during initialization.

This change allows us to prevent the tune at startup for devices that perform
better without it.

Signed-off-by: Michael Krufky <mkrufky@kernellabs.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Michael Krufky 2009-10-24 16:42:16 -03:00 committed by Mauro Carvalho Chehab
parent 64f4d9a367
commit d6eef49478
1 changed files with 7 additions and 2 deletions
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9
drivers/media/video/tuner-core.c
View file

@ -320,6 +320,7 @@ static void set_type(struct i2c_client *c, unsigned int type,
struct dvb_tuner_ops *fe_tuner_ops = &t->fe.ops.tuner_ops;
struct analog_demod_ops *analog_ops = &t->fe.ops.analog_ops;
unsigned char buffer[4];
int tune_now = 1;
if (type == UNSET || type == TUNER_ABSENT) {
tuner_dbg ("tuner 0x%02x: Tuner type absent\n",c->addr);
@ -404,6 +405,7 @@ static void set_type(struct i2c_client *c, unsigned int type,
};
if (!dvb_attach(xc2028_attach, &t->fe, &cfg))
goto attach_failed;
tune_now = 0;
break;
}
case TUNER_TDA9887:
@ -419,6 +421,7 @@ static void set_type(struct i2c_client *c, unsigned int type,
if (!dvb_attach(xc5000_attach,
&t->fe, t->i2c->adapter, &xc5000_cfg))
goto attach_failed;
tune_now = 0;
break;
}
case TUNER_NXP_TDA18271:
@ -430,6 +433,7 @@ static void set_type(struct i2c_client *c, unsigned int type,
if (!dvb_attach(tda18271_attach, &t->fe, t->i2c->addr,
t->i2c->adapter, &cfg))
goto attach_failed;
tune_now = 0;
break;
}
default:
@ -458,12 +462,13 @@ static void set_type(struct i2c_client *c, unsigned int type,
if (t->mode_mask == T_UNINITIALIZED)
t->mode_mask = new_mode_mask;
/* xc2028/3028 and xc5000 requires a firmware to be set-up later
/* Some tuners require more initialization setup before use,
such as firmware download or device calibration.
trying to set a frequency here will just fail
FIXME: better to move set_freq to the tuner code. This is needed
on analog tuners for PLL to properly work
*/
if (t->type != TUNER_XC2028 && t->type != TUNER_XC5000)
if (tune_now)
set_freq(c, (V4L2_TUNER_RADIO == t->mode) ?
t->radio_freq : t->tv_freq);