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Commit 74d50724 authored by Michael Krufky's avatar Michael Krufky Committed by Mauro Carvalho Chehab
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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: default avatarMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 104fe9a2

drivers/media/dvb/frontends/au8522.c

+21 −2
Original line number Diff line number Diff line
@@ -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,