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

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>

diff --git a/drivers/media/video/tuner-core.c b/drivers/media/video/tuner-core.c
index a9c9703113c2fa3b8dee0dae96adceb88c7157c7..5b3eaa16afd2261f1253b702b81dad9362604f6c 100644 (file)
--- a/drivers/media/video/tuner-core.c
+++ b/drivers/media/video/tuner-core.c
@@ -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);