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authorChris Pascoe <c.pascoe@itee.uq.edu.au>2007-11-19 03:47:07 -0300
committerMauro Carvalho Chehab <mchehab@infradead.org>2007-12-11 18:08:13 -0200
commit78f3b0b672c79df9ffa55399a7d6fc4b173e9b4b (patch)
treea812b2baa98b2d1f6da918df60e86f7be2489813 /drivers/media
parent820eacd84cff23b76693f4be1e28feb672f4488f (diff)
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>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/dvb/frontends/zl10353.c4
-rw-r--r--drivers/media/dvb/frontends/zl10353.h2
2 files changed, 3 insertions, 3 deletions
diff --git a/drivers/media/dvb/frontends/zl10353.c b/drivers/media/dvb/frontends/zl10353.c
index a97a7fd2c89..0106df4c55e 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 cb274dc12b8..1c3d494a6da 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;