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[media] m88ds3103: improve ts clock setting 

Simplify TS clock divider calculation and programming slightly.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Antti Palosaari 2016-06-29 20:39:46 -03:00 committed by Mauro Carvalho Chehab
parent 9ef3cdc1ef
commit 334ef18e87
1 changed files with 16 additions and 23 deletions
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39
drivers/media/dvb-frontends/m88ds3103.c
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@ -306,7 +306,7 @@ static int m88ds3103_set_frontend(struct dvb_frontend *fe)
const struct m88ds3103_reg_val *init;
u8 u8tmp, u8tmp1 = 0, u8tmp2 = 0; /* silence compiler warning */
u8 buf[3];
u16 u16tmp, divide_ratio = 0;
u16 u16tmp;
u32 tuner_frequency, target_mclk;
s32 s32tmp;
@ -522,37 +522,25 @@ static int m88ds3103_set_frontend(struct dvb_frontend *fe)
ret = m88ds3103_update_bits(dev, 0x29, 0x20, u8tmp1);
if (ret)
goto err;
u8tmp1 = 0;
u8tmp2 = 0;
u16tmp = 0;
u8tmp1 = 0x3f;
u8tmp2 = 0x3f;
break;
default:
if (dev->cfg->ts_clk) {
divide_ratio = DIV_ROUND_UP(target_mclk, dev->cfg->ts_clk);
u8tmp1 = divide_ratio / 2;
u8tmp2 = DIV_ROUND_UP(divide_ratio, 2);
}
u16tmp = DIV_ROUND_UP(target_mclk, dev->cfg->ts_clk);
u8tmp1 = u16tmp / 2 - 1;
u8tmp2 = DIV_ROUND_UP(u16tmp, 2) - 1;
}
dev_dbg(&client->dev,
"target_mclk=%d ts_clk=%d divide_ratio=%d\n",
target_mclk, dev->cfg->ts_clk, divide_ratio);
dev_dbg(&client->dev, "target_mclk=%d ts_clk=%d ts_clk_divide_ratio=%u\n",
target_mclk, dev->cfg->ts_clk, u16tmp);
u8tmp1--;
u8tmp2--;
/* u8tmp1[5:2] => fe[3:0], u8tmp1[1:0] => ea[7:6] */
u8tmp1 &= 0x3f;
/* u8tmp2[5:0] => ea[5:0] */
u8tmp2 &= 0x3f;
ret = regmap_bulk_read(dev->regmap, 0xfe, &u8tmp, 1);
u8tmp = (u8tmp1 >> 2) & 0x0f;
ret = regmap_update_bits(dev->regmap, 0xfe, 0x0f, u8tmp);
if (ret)
goto err;
u8tmp = ((u8tmp & 0xf0) << 0) | u8tmp1 >> 2;
ret = regmap_write(dev->regmap, 0xfe, u8tmp);
if (ret)
goto err;
u8tmp = ((u8tmp1 & 0x03) << 6) | u8tmp2 >> 0;
ret = regmap_write(dev->regmap, 0xea, u8tmp);
if (ret)
@ -1444,6 +1432,11 @@ static int m88ds3103_probe(struct i2c_client *client,
goto err_kfree;
}
if (!pdata->ts_clk) {
ret = -EINVAL;
goto err_kfree;
}
/* 0x29 register is defined differently for m88rs6000. */
/* set internal tuner address to 0x21 */
if (dev->chip_id == M88RS6000_CHIP_ID)