[media] r820t: Remove a warning for an unused value

Currently, the driver complains about the pre_detect var:

	drivers/media/tuners/r820t.c: In function 'r820t_sysfreq_sel':
	drivers/media/tuners/r820t.c:722:31: warning: variable 'pre_dect' set but not used [-Wunused-but-set-variable]

While rtl8232 code comments it, perhaps some other driver may use.
So, the better is to keep the code there, allowing to enable it
via r820t config data.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/media/tuners/r820t.c b/drivers/media/tuners/r820t.c
index e6e7a06d2b40..4835021aa3b6 100644
--- a/drivers/media/tuners/r820t.c
+++ b/drivers/media/tuners/r820t.c
@@ -797,6 +797,13 @@ static int r820t_sysfreq_sel(struct r820t_priv *priv, u32 freq,
                 cable2_in = 0x00;
         }
 
+
+        if (priv->cfg->use_predetect) {
+                rc = r820t_write_reg_mask(priv, 0x06, pre_dect, 0x40);
+                if (rc < 0)
+                        return rc;
+        }
+
         rc = r820t_write_reg_mask(priv, 0x1d, lna_top, 0xc7);
         if (rc < 0)
                 return rc;
diff --git a/drivers/media/tuners/r820t.h b/drivers/media/tuners/r820t.h
index 4c0823b21693..48af3548027d 100644
--- a/drivers/media/tuners/r820t.h
+++ b/drivers/media/tuners/r820t.h
@@ -39,6 +39,7 @@ struct r820t_config {
         enum r820t_chip rafael_chip;
         unsigned max_i2c_msg_len;
         bool use_diplexer;
+        bool use_predetect;
 };
 
 #if IS_ENABLED(CONFIG_MEDIA_TUNER_R820T)