Skip to content

Commit

Permalink
V4L/DVB (8044): au8522: tuning optimizations
Browse files Browse the repository at this point in the history
If the current modulation and frequency is already set to
the desired parameters, then don't re-tune.

Don't store current frequency until after we've tuned successfully.

Force a re-tune after resume from standby.

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
  • Loading branch information
Michael Krufky authored and Mauro Carvalho Chehab committed Jun 26, 2008
1 parent 104fe9a commit 74d5072
Showing 1 changed file with 21 additions and 2 deletions.
23 changes: 21 additions & 2 deletions drivers/media/dvb/frontends/au8522.c
Original file line number Diff line number Diff line change
Expand Up @@ -463,10 +463,13 @@ static int au8522_set_frontend(struct dvb_frontend *fe,
struct dvb_frontend_parameters *p)
{
struct au8522_state *state = fe->demodulator_priv;
int ret = -EINVAL;

dprintk("%s(frequency=%d)\n", __func__, p->frequency);

state->current_frequency = p->frequency;
if ((state->current_frequency == p->frequency) &&
(state->current_modulation == p->u.vsb.modulation))
return 0;

au8522_enable_modulation(fe, p->u.vsb.modulation);

Expand All @@ -476,11 +479,16 @@ static int au8522_set_frontend(struct dvb_frontend *fe,
if (fe->ops.tuner_ops.set_params) {
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 1);
fe->ops.tuner_ops.set_params(fe, p);
ret = fe->ops.tuner_ops.set_params(fe, p);
if (fe->ops.i2c_gate_ctrl)
fe->ops.i2c_gate_ctrl(fe, 0);
}

if (ret < 0)
return ret;

state->current_frequency = p->frequency;

return 0;
}

Expand All @@ -498,6 +506,16 @@ static int au8522_init(struct dvb_frontend *fe)
return 0;
}

static int au8522_sleep(struct dvb_frontend *fe)
{
struct au8522_state *state = fe->demodulator_priv;
dprintk("%s()\n", __func__);

state->current_frequency = 0;

return 0;
}

static int au8522_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
struct au8522_state *state = fe->demodulator_priv;
Expand Down Expand Up @@ -672,6 +690,7 @@ static struct dvb_frontend_ops au8522_ops = {
},

.init = au8522_init,
.sleep = au8522_sleep,
.i2c_gate_ctrl = au8522_i2c_gate_ctrl,
.set_frontend = au8522_set_frontend,
.get_frontend = au8522_get_frontend,
Expand Down

0 comments on commit 74d5072

Please sign in to comment.