[media] tda18271c2dd: Fix saw filter configuration for DVB-C @6MHz

Currently, the driver assumes that all QAM carriers are spaced with
8MHz. This is wrong, and may decrease QoS on Countries like Brazil,
that have DVB-C carriers with 6MHz-spaced.

Fortunately, both ITU-T J-83 and EN 300 429 specifies a way to
associate the symbol rate with the bandwidth needed for it.

For ITU-T J-83 2007 annex A, the maximum symbol rate for 6 MHz is:
	6 MHz / 1.15 = 5217391 Bauds
For  ITU-T J-83 2007 annex C, the maximum symbol rate for 6 MHz is:
	6 MHz / 1.13 = 5309735 Bauds.

As this tuner is currently used only for DRX-K, and it is currently
hard-coded to annex A, I've opted to use the roll-off factor of 0.15,
instead of 0.13.

If we ever support annex C, the better would be to add a DVB S2API
call to allow changing between Annex A and C, and add the 0.13 roll-off
factor to it.

This code is currently being used on other frontends, so I think we
should later add a core function with this code, to warrant that
it will be properly implemented everywhere.

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

1 files changed, 19 insertions, 1 deletions

diff --git a/drivers/media/dvb/frontends/tda18271c2dd.c b/drivers/media/dvb/frontends/tda18271c2dd.c
index 2eb3a31a715c..0384e8da4f5e 100644
--- a/drivers/media/dvb/frontends/tda18271c2dd.c
+++ b/drivers/media/dvb/frontends/tda18271c2dd.c
@@ -1123,6 +1123,21 @@ static int release(struct dvb_frontend *fe)
         return 0;
 }
 
+/*
+ * As defined on EN 300 429 Annex A and on ITU-T J.83 annex A, the DVB-C
+ * roll-off factor is 0.15.
+ * According with the specs, the amount of the needed bandwith is given by:
+ *      Bw = Symbol_rate * (1 + 0.15)
+ * As such, the maximum symbol rate supported by 6 MHz is
+ *      max_symbol_rate = 6 MHz / 1.15 = 5217391 Bauds
+ *NOTE: For ITU-T J.83 Annex C, the roll-off factor is 0.13. So:
+ *      max_symbol_rate = 6 MHz / 1.13 = 5309735 Baud
+ *      That means that an adjustment is needed for Japan,
+ *      but, as currently DRX-K is hardcoded to Annex A, let's stick
+ *      with 0.15 roll-off factor.
+ */
+#define MAX_SYMBOL_RATE_6MHz    5217391
+
 static int set_params(struct dvb_frontend *fe,
                       struct dvb_frontend_parameters *params)
 {
@@ -1146,7 +1161,10 @@ static int set_params(struct dvb_frontend *fe,
                         break;
                 }
         else if (fe->ops.info.type == FE_QAM) {
-                Standard = HF_DVBC_8MHZ;
+                if (params->u.qam.symbol_rate <= MAX_SYMBOL_RATE_6MHz)
+                        Standard = HF_DVBC_6MHZ;
+                else
+                        Standard = HF_DVBC_8MHZ;
         } else
                 return -EINVAL;
         do {