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

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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>
This commit is contained in:
Chris Pascoe 2007-11-19 03:47:07 -03:00 committed by Mauro Carvalho Chehab
parent 820eacd84c
commit 78f3b0b672
2 changed files with 3 additions and 3 deletions
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4
drivers/media/dvb/frontends/zl10353.c
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@ -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);

2
drivers/media/dvb/frontends/zl10353.h
View file

@ -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;