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media: af9013: change lock detection slightly 

Whilst rewritten largely, the basic logic remains same with one
exception: do not return immediately on success case. We are going to
add statistics that function and cannot return too early.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Antti Palosaari 2017-06-21 11:02:42 -04:00 committed by Mauro Carvalho Chehab
parent 35ecf2b4d2
commit 7903fbe3a6
1 changed files with 28 additions and 29 deletions
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57
drivers/media/dvb-frontends/af9013.c
View File

@ -752,45 +752,44 @@ static int af9013_read_status(struct dvb_frontend *fe, enum fe_status *status)
struct af9013_state *state = fe->demodulator_priv;
struct i2c_client *client = state->client;
int ret;
unsigned int utmp;
unsigned int utmp, utmp1;
/*
* Return status from the cache if it is younger than 2000ms with the
* exception of last tune is done during 4000ms.
*/
if (time_is_after_jiffies(
state->read_status_jiffies + msecs_to_jiffies(2000)) &&
time_is_before_jiffies(
state->set_frontend_jiffies + msecs_to_jiffies(4000))
) {
*status = state->fe_status;
return 0;
if (time_is_after_jiffies(state->read_status_jiffies + msecs_to_jiffies(2000)) &&
time_is_before_jiffies(state->set_frontend_jiffies + msecs_to_jiffies(4000))) {
*status = state->fe_status;
} else {
*status = 0;
}
/* MPEG2 lock */
ret = regmap_read(state->regmap, 0xd507, &utmp);
if (ret)
goto err;
if ((utmp >> 6) & 0x01)
*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
FE_HAS_SYNC | FE_HAS_LOCK;
if (!*status) {
/* TPS lock */
ret = regmap_read(state->regmap, 0xd330, &utmp);
/* MPEG2 lock */
ret = regmap_read(state->regmap, 0xd507, &utmp);
if (ret)
goto err;
if ((utmp >> 3) & 0x01)
*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
FE_HAS_VITERBI;
}
if ((utmp >> 6) & 0x01) {
utmp1 = FE_HAS_SIGNAL | FE_HAS_CARRIER |
FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
} else {
/* TPS lock */
ret = regmap_read(state->regmap, 0xd330, &utmp);
if (ret)
goto err;
state->fe_status = *status;
state->read_status_jiffies = jiffies;
if ((utmp >> 3) & 0x01)
utmp1 = FE_HAS_SIGNAL | FE_HAS_CARRIER |
FE_HAS_VITERBI;
else
utmp1 = 0;
}
dev_dbg(&client->dev, "fe_status %02x\n", utmp1);
state->read_status_jiffies = jiffies;
state->fe_status = utmp1;
*status = utmp1;
}
return 0;
err: