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 084a280..978a287 100644 (file)
--- a/drivers/media/dvb/frontends/au8522.c
+++ b/drivers/media/dvb/frontends/au8522.c
@@ -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);
 
@@ -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;
 }
 
@@ -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;
@@ -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,