V4L/DVB (8044): au8522: tuning optimizations
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>
diff --git a/drivers/media/dvb/frontends/au8522.c b/drivers/media/dvb/frontends/au8522.c
index 084a280c..978a287 100644
--- a/drivers/media/dvb/frontends/au8522.c
+++ b/drivers/media/dvb/frontends/au8522.c
@@ -463,10 +463,13 @@
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);
@@ -476,11 +479,16 @@
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;
}
@@ -498,6 +506,16 @@
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;
@@ -672,6 +690,7 @@
},
.init = au8522_init,
+ .sleep = au8522_sleep,
.i2c_gate_ctrl = au8522_i2c_gate_ctrl,
.set_frontend = au8522_set_frontend,
.get_frontend = au8522_get_frontend,