V4L/DVB (13838): atbm8830: use AGC setting from config

Improves ATBM8830 reception by using per card AGC configuration rather
than register default.

Signed-off-by: David T. L. Wong <davidtlwong@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/media/dvb/frontends/atbm8830.c b/drivers/media/dvb/frontends/atbm8830.c
index 59881a5944eb..43aac2f85c2e 100644
--- a/drivers/media/dvb/frontends/atbm8830.c
+++ b/drivers/media/dvb/frontends/atbm8830.c
@@ -170,6 +170,19 @@ static int is_locked(struct atbm_state *priv, u8 *locked)
         return 0;
 }
 
+static int set_agc_config(struct atbm_state *priv,
+        u8 min, u8 max, u8 hold_loop)
+{
+        /* no effect if both min and max are zero */
+        if (!min && !max)
+            return 0;
+
+        atbm8830_write_reg(priv, REG_AGC_MIN, min);
+        atbm8830_write_reg(priv, REG_AGC_MAX, max);
+        atbm8830_write_reg(priv, REG_AGC_HOLD_LOOP, hold_loop);
+
+        return 0;
+}
 
 static int set_static_channel_mode(struct atbm_state *priv)
 {
@@ -227,6 +240,9 @@ static int atbm8830_init(struct dvb_frontend *fe)
         /*Set IF frequency*/
         set_if_freq(priv, cfg->if_freq);
 
+        /*Set AGC Config*/
+        set_agc_config(priv, cfg->agc_min, cfg->agc_max,
+                cfg->agc_hold_loop);
 
         /*Set static channel mode*/
         set_static_channel_mode(priv);