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Commit 8b302d43 authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] fc2580: calculate filter control word dynamically 



Calculate low-pass filter control word dynamically from given radio
channel bandwidth.

Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@osg.samsung.com>
parent 7e33f8a2

drivers/media/tuners/fc2580.c

+4 −4
Original line number Diff line number Diff line
@@ -46,7 +46,7 @@ static int fc2580_set_params(struct dvb_frontend *fe) 
	int ret, i;

	unsigned int uitmp, div_ref, div_ref_val, div_n, k, k_cw, div_out;

	u64 f_vco;

	u8 u8tmp, synth_config;

	u8 synth_config;

	unsigned long timeout;



	dev_dbg(&client->dev,
@@ -249,9 +249,9 @@ static int fc2580_set_params(struct dvb_frontend *fe) 
	if (ret)

		goto err;



	u8tmp = div_u64((u64) dev->clk * fc2580_if_filter_lut[i].mul,

			1000000000);

	ret = regmap_write(dev->regmap, 0x37, u8tmp);

	uitmp = (unsigned int) 8058000 - (c->bandwidth_hz * 122 / 100 / 2);

	uitmp = div64_u64((u64) dev->clk * uitmp, 1000000000000ULL);

	ret = regmap_write(dev->regmap, 0x37, uitmp);

	if (ret)

		goto err;

drivers/media/tuners/fc2580_priv.h

+4 −5
Original line number Diff line number Diff line
@@ -64,16 +64,15 @@ static const struct fc2580_pll fc2580_pll_lut[] = { 


struct fc2580_if_filter {

	u32 freq;

	u16 mul;

	u8 r36_val;

	u8 r39_val;

};



static const struct fc2580_if_filter fc2580_if_filter_lut[] = {

	{   6000000, 4400, 0x18, 0x00},

	{   7000000, 3910, 0x18, 0x80},

	{   8000000, 3300, 0x18, 0x80},

	{0xffffffff, 3300, 0x18, 0x80},

	{   6000000, 0x18, 0x00},

	{   7000000, 0x18, 0x80},

	{   8000000, 0x18, 0x80},

	{0xffffffff, 0x18, 0x80},

};



struct fc2580_freq_regs {