V4L/DVB (7656): tda826x: Calculate cut off fequency from symbol rate

This patch makes the tuner work with transonders providing higher
symbol rates.
It was contributed by Oliver Endriss.

Signed-off-by: Hartmut Hackmann <hartmut.hackmann@t-online.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/media/dvb/frontends/tda826x.c b/drivers/media/dvb/frontends/tda826x.c
index 5a15bb4263fb..a051554b5e25 100644
--- a/drivers/media/dvb/frontends/tda826x.c
+++ b/drivers/media/dvb/frontends/tda826x.c
@@ -75,6 +75,8 @@ static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_param
         struct tda826x_priv *priv = fe->tuner_priv;
         int ret;
         u32 div;
+        u32 ksyms;
+        u32 bandwidth;
         u8 buf [11];
         struct i2c_msg msg = { .addr = priv->i2c_address, .flags = 0, .buf = buf, .len = 11 };
 
@@ -82,6 +84,15 @@ static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_param
 
         div = (params->frequency + (1000-1)) / 1000;
 
+        /* BW = ((1 + RO) * SR/2 + 5) * 1.3      [SR in MSPS, BW in MHz] */
+        /* with R0 = 0.35 and some transformations: */
+        ksyms = params->u.qpsk.symbol_rate / 1000;
+        bandwidth = (878 * ksyms + 6500000) / 1000000 + 1;
+        if (bandwidth < 5)
+                bandwidth = 5;
+        else if (bandwidth > 36)
+                bandwidth = 36;
+
         buf[0] = 0x00; // subaddress
         buf[1] = 0x09; // powerdown RSSI + the magic value 1
         if (!priv->has_loopthrough)
@@ -89,7 +100,7 @@ static int tda826x_set_params(struct dvb_frontend *fe, struct dvb_frontend_param
         buf[2] = (1<<5) | 0x0b; // 1Mhz + 0.45 VCO
         buf[3] = div >> 7;
         buf[4] = div << 1;
-        buf[5] = 0x77; // baseband cut-off 19 MHz
+        buf[5] = ((bandwidth - 5) << 3) | 7; /* baseband cut-off */
         buf[6] = 0xfe; // baseband gain 9 db + no RF attenuation
         buf[7] = 0x83; // charge pumps at high, tests off
         buf[8] = 0x80; // recommended value 4 for AMPVCO + disable ports.