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[media] fc2580: calculate filter control word dynamically

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

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Antti Palosaari 2015-05-03 15:16:52 -03:00 committed by Mauro Carvalho Chehab
parent 7e33f8a282
commit 8b302d43e8
2 changed files with 8 additions and 9 deletions
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8
drivers/media/tuners/fc2580.c
View file

@ -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;

9
drivers/media/tuners/fc2580_priv.h
View file

@ -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 {