[media] r820t: add support for diplexer

This is part of the original driver, and adding it doesn't hurt,
so add it, to better sync the code.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Tested-by: Antti Palosaari <crope@iki.fi>

2 files changed, 13 insertions, 1 deletions

diff --git a/drivers/media/tuners/r820t.c b/drivers/media/tuners/r820t.c
index bb154449a2cf..5be4635c521d 100644
--- a/drivers/media/tuners/r820t.c
+++ b/drivers/media/tuners/r820t.c
@@ -101,6 +101,7 @@ struct r820t_freq_range {
 };
 
 #define VCO_POWER_REF   0x02
+#define DIP_FREQ        32000000
 
 /*
  * Static constants
@@ -751,6 +752,17 @@ static int r820t_sysfreq_sel(struct r820t_priv *priv, u32 freq,
                 break;
         }
 
+        if (priv->cfg->use_diplexer &&
+           ((priv->cfg->rafael_chip == CHIP_R820T) ||
+           (priv->cfg->rafael_chip == CHIP_R828S) ||
+           (priv->cfg->rafael_chip == CHIP_R820C))) {
+                if (freq > DIP_FREQ)
+                        air_cable1_in = 0x00;
+                else
+                        air_cable1_in = 0x60;
+                cable2_in = 0x00;
+        }
+
         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 a64a7b630729..949575a41d49 100644
--- a/drivers/media/tuners/r820t.h
+++ b/drivers/media/tuners/r820t.h
@@ -32,10 +32,10 @@ enum r820t_chip {
 
 struct r820t_config {
         u8 i2c_addr;            /* 0x34 */
-
         u32 xtal;
         enum r820t_chip rafael_chip;
         unsigned max_i2c_msg_len;
+        bool use_diplexer;
 };
 
 #if IS_ENABLED(CONFIG_MEDIA_TUNER_R820T)