[media] ts2020: Allow stats polling to be suppressed

Statistics polling can not be done by lmedm04 driver's implementation of
M88RS2000/TS2020 because I2C messages stop the device's demuxer, so allow
polling for statistics to be suppressed in the ts2020 driver by setting
dont_poll in the ts2020_config struct.

Reported-by: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Malcolm Priestley <tvboxspy@gmail.com>
Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/dvb-frontends/ts2020.c b/drivers/media/dvb-frontends/ts2020.c
index 8c997d0..946d8e9 100644 (file)
--- a/drivers/media/dvb-frontends/ts2020.c
+++ b/drivers/media/dvb-frontends/ts2020.c
@@ -40,6 +40,7 @@ struct ts2020_priv {
        bool loop_through:1;
        u8 clk_out:2;
        u8 clk_out_div:5;
+       bool dont_poll:1;
        u32 frequency_div; /* LO output divider switch frequency */
        u32 frequency_khz; /* actual used LO frequency */
 #define TS2020_M88TS2020 0
@@ -52,6 +53,8 @@ struct ts2020_reg_val {
        u8 val;
 };
 
+static void ts2020_stat_work(struct work_struct *work);
+
 static int ts2020_release(struct dvb_frontend *fe)
 {
        struct ts2020_priv *priv = fe->tuner_priv;
@@ -79,7 +82,8 @@ static int ts2020_sleep(struct dvb_frontend *fe)
                return ret;
 
        /* stop statistics polling */
-       cancel_delayed_work_sync(&priv->stat_work);
+       if (!priv->dont_poll)
+               cancel_delayed_work_sync(&priv->stat_work);
        return 0;
 }
 
@@ -152,8 +156,8 @@ static int ts2020_init(struct dvb_frontend *fe)
        c->strength.stat[0].scale = FE_SCALE_DECIBEL;
        c->strength.stat[0].uvalue = 0;
 
-       /* Start statistics polling */
-       schedule_delayed_work(&priv->stat_work, 0);
+       /* Start statistics polling by invoking the work function */
+       ts2020_stat_work(&priv->stat_work.work);
        return 0;
 }
 
@@ -445,7 +449,8 @@ static void ts2020_stat_work(struct work_struct *work)
 
        c->strength.stat[0].scale = FE_SCALE_DECIBEL;
 
-       schedule_delayed_work(&priv->stat_work, msecs_to_jiffies(2000));
+       if (!priv->dont_poll)
+               schedule_delayed_work(&priv->stat_work, msecs_to_jiffies(2000));
        return;
 err:
        dev_dbg(&client->dev, "failed=%d\n", ret);
@@ -458,9 +463,13 @@ static int ts2020_read_signal_strength(struct dvb_frontend *fe,
                                       u16 *_signal_strength)
 {
        struct dtv_frontend_properties *c = &fe->dtv_property_cache;
+       struct ts2020_priv *priv = fe->tuner_priv;
        unsigned strength;
        __s64 gain;
 
+       if (priv->dont_poll)
+               ts2020_stat_work(&priv->stat_work.work);
+
        if (c->strength.stat[0].scale == FE_SCALE_NOT_AVAILABLE) {
                *_signal_strength = 0;
                return 0;
@@ -585,6 +594,7 @@ static int ts2020_probe(struct i2c_client *client,
        dev->loop_through = pdata->loop_through;
        dev->clk_out = pdata->clk_out;
        dev->clk_out_div = pdata->clk_out_div;
+       dev->dont_poll = pdata->dont_poll;
        dev->frequency_div = pdata->frequency_div;
        dev->fe = fe;
        dev->get_agc_pwm = pdata->get_agc_pwm;

diff --git a/drivers/media/dvb-frontends/ts2020.h b/drivers/media/dvb-frontends/ts2020.h
index 002bc0a..9220e5c 100644 (file)
--- a/drivers/media/dvb-frontends/ts2020.h
+++ b/drivers/media/dvb-frontends/ts2020.h
@@ -48,6 +48,9 @@ struct ts2020_config {
         */
        u8 clk_out_div:5;
 
+       /* Set to true to suppress stat polling */
+       bool dont_poll:1;
+
        /*
         * pointer to DVB frontend
         */