V4L/DVB (6629): zl10353: fix default adc_clock and TRL nominal rate calculation

The default adc_clock for the zl10353 is different from what was originally
thought to be the case and the TRL nominal rate formula was incorrect as a
result.  Use a better (and hopefully now correct) formula.

Signed-off-by: Chris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 3 insertions, 3 deletions

diff --git a/drivers/media/dvb/frontends/zl10353.c b/drivers/media/dvb/frontends/zl10353.c
index a97a7fd2c891..0106df4c55e8 100644
--- a/drivers/media/dvb/frontends/zl10353.c
+++ b/drivers/media/dvb/frontends/zl10353.c
@@ -122,7 +122,7 @@ static void zl10353_calc_nominal_rate(struct dvb_frontend *fe,
                                       enum fe_bandwidth bandwidth,
                                       u16 *nominal_rate)
 {
-        u32 adc_clock = 22528; /* 20.480 MHz on the board(!?) */
+        u32 adc_clock = 45056; /* 45.056 MHz */
         u8 bw;
         struct zl10353_state *state = fe->demodulator_priv;
 
@@ -142,7 +142,7 @@ static void zl10353_calc_nominal_rate(struct dvb_frontend *fe,
                 break;
         }
 
-        *nominal_rate = (64 * bw * (1<<16) / (7 * 8) * 4000 / adc_clock + 2) / 4;
+        *nominal_rate = (bw * (1 << 23) / 7 * 125 + adc_clock / 2) / adc_clock;
 
         dprintk("%s: bw %d, adc_clock %d => 0x%x\n",
                 __FUNCTION__, bw, adc_clock, *nominal_rate);
diff --git a/drivers/media/dvb/frontends/zl10353.h b/drivers/media/dvb/frontends/zl10353.h
index cb274dc12b82..1c3d494a6da9 100644
--- a/drivers/media/dvb/frontends/zl10353.h
+++ b/drivers/media/dvb/frontends/zl10353.h
@@ -30,7 +30,7 @@ struct zl10353_config
         u8 demod_address;
 
         /* frequencies in kHz */
-        int adc_clock;  // default: 22528
+        int adc_clock;  /* default: 45056 */
 
         /* set if no pll is connected to the secondary i2c bus */
         int no_tuner;