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Commit 78f3b0b6 authored by Chris Pascoe's avatar Chris Pascoe Committed by Mauro Carvalho Chehab
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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: default avatarChris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 820eacd8

drivers/media/dvb/frontends/zl10353.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

drivers/media/dvb/frontends/zl10353.h

+1 −1
Original line number Diff line number Diff line
@@ -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;