V4L/DVB (11918): tuner-xc2028: Fix offset frequencies for DVB @ 6MHz

Both ATSC and DVB @ 6MHz bandwidth require the same offset.

While we're fixing it, let's cleanup the bandwidth setup to better
reflect the fact that it is a function of the bandwidth.

Thanks to Terry Wu <terrywu2009@gmail.com> for pointing this issue and
to Andy Walls <awalls@radix.net> for an initial patch for this fix.

Cc: Terry Wu <terrywu2009@gmail.com>
Acked-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 20 insertions, 13 deletions

diff --git a/drivers/media/common/tuners/tuner-xc2028.c b/drivers/media/common/tuners/tuner-xc2028.c
index 14649e456fd..27e7cb6622b 100644
--- a/drivers/media/common/tuners/tuner-xc2028.c
+++ b/drivers/media/common/tuners/tuner-xc2028.c
@@ -917,22 +917,29 @@ static int generic_set_freq(struct dvb_frontend *fe, u32 freq /* in HZ */,
          * that xc2028 will be in a safe state.
          * Maybe this might also be needed for DTV.
          */
-        if (new_mode == T_ANALOG_TV) {
+        if (new_mode == T_ANALOG_TV)
                 rc = send_seq(priv, {0x00, 0x00});
-        } else if (priv->cur_fw.type & ATSC) {
-                offset = 1750000;
-        } else {
-                offset = 2750000;
+
+        /*
+         * Digital modes require an offset to adjust to the
+         * proper frequency.
+         * Analog modes require offset = 0
+         */
+        if (new_mode != T_ANALOG_TV) {
+                /* Sets the offset according with firmware */
+                if (priv->cur_fw.type & DTV6)
+                        offset = 1750000;
+                else if (priv->cur_fw.type & DTV7)
+                        offset = 2250000;
+                else    /* DTV8 or DTV78 */
+                        offset = 2750000;
+
                 /*
-                 * We must adjust the offset by 500kHz in two cases in order
-                 * to correctly center the IF output:
-                 * 1) When the ZARLINK456 or DIBCOM52 tables were explicitly
-                 *    selected and a 7MHz channel is tuned;
-                 * 2) When tuning a VHF channel with DTV78 firmware.
+                 * We must adjust the offset by 500kHz  when
+                 * tuning a 7MHz VHF channel with DTV78 firmware
+                 * (used in Australia, Italy and Germany)
                  */
-                if (((priv->cur_fw.type & DTV7) &&
-                     (priv->cur_fw.scode_table & (ZARLINK456 | DIBCOM52))) ||
-                    ((priv->cur_fw.type & DTV78) && freq < 470000000))
+                if ((priv->cur_fw.type & DTV78) && freq < 470000000)
                         offset -= 500000;
         }