Some software reports no signal found on a frequency due to immediately checking for lock as soon as set_params returns. This waits up 40ms for tuning operation, then from 30-150ms (dig/analog) for signal lock before returning from set_params and set_analog_params.
Tuning typically completes in 20-30ms. Digital tuning will additionally wait depending on signal characteristics. Analog tuning will wait the full timeout in case of no signal. Signed-off-by: Brad Love <[email protected]> --- No changes drivers/media/tuners/si2157.c | 87 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) diff --git a/drivers/media/tuners/si2157.c b/drivers/media/tuners/si2157.c index 1006172..36b2ea8 100644 --- a/drivers/media/tuners/si2157.c +++ b/drivers/media/tuners/si2157.c @@ -301,6 +301,89 @@ static int si2157_sleep(struct dvb_frontend *fe) return ret; } +static int si2157_tune_wait(struct i2c_client *client, u8 is_digital) +{ +#define TUN_TIMEOUT 40 +#define DIG_TIMEOUT 30 +#define ANALOG_TIMEOUT 150 + struct si2157_dev *dev = i2c_get_clientdata(client); + int ret; + unsigned long timeout; + unsigned long start_time; + u8 wait_status; + u8 tune_lock_mask; + + if (is_digital) + tune_lock_mask = 0x04; + else + tune_lock_mask = 0x02; + + mutex_lock(&dev->i2c_mutex); + + /* wait tuner command complete */ + start_time = jiffies; + timeout = start_time + msecs_to_jiffies(TUN_TIMEOUT); + while (!time_after(jiffies, timeout)) { + ret = i2c_master_recv(client, &wait_status, + sizeof(wait_status)); + if (ret < 0) { + goto err_mutex_unlock; + } else if (ret != sizeof(wait_status)) { + ret = -EREMOTEIO; + goto err_mutex_unlock; + } + + /* tuner done? */ + if ((wait_status & 0x81) == 0x81) + break; + usleep_range(5000, 10000); + } + + dev_dbg(&client->dev, "tuning took %d ms, status=0x%x\n", + jiffies_to_msecs(jiffies) - jiffies_to_msecs(start_time), + wait_status); + + /* if we tuned ok, wait a bit for tuner lock */ + if ((wait_status & 0x81) == 0x81) { + if (is_digital) + timeout = jiffies + msecs_to_jiffies(DIG_TIMEOUT); + else + timeout = jiffies + msecs_to_jiffies(ANALOG_TIMEOUT); + while (!time_after(jiffies, timeout)) { + ret = i2c_master_recv(client, &wait_status, + sizeof(wait_status)); + if (ret < 0) { + goto err_mutex_unlock; + } else if (ret != sizeof(wait_status)) { + ret = -EREMOTEIO; + goto err_mutex_unlock; + } + + /* tuner locked? */ + if (wait_status & tune_lock_mask) + break; + usleep_range(5000, 10000); + } + } + + dev_dbg(&client->dev, "tuning+lock took %d ms, status=0x%x\n", + jiffies_to_msecs(jiffies) - jiffies_to_msecs(start_time), + wait_status); + + if ((wait_status & 0xc0) != 0x80) { + ret = -ETIMEDOUT; + goto err_mutex_unlock; + } + + mutex_unlock(&dev->i2c_mutex); + return 0; + +err_mutex_unlock: + mutex_unlock(&dev->i2c_mutex); + dev_dbg(&client->dev, "failed=%d\n", ret); + return ret; +} + static int si2157_set_params(struct dvb_frontend *fe) { struct i2c_client *client = fe->tuner_priv; @@ -400,6 +483,8 @@ static int si2157_set_params(struct dvb_frontend *fe) dev->bandwidth = bandwidth; dev->frequency = c->frequency; + si2157_tune_wait(client, 1); /* wait to complete, ignore any errors */ + return 0; err: dev->bandwidth = 0; @@ -609,6 +694,8 @@ static int si2157_set_analog_params(struct dvb_frontend *fe, #endif dev->bandwidth = bandwidth; + si2157_tune_wait(client, 0); /* wait to complete, ignore any errors */ + return 0; err: dev->bandwidth = 0; -- 2.7.4
