[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>

diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c
index 6f03ca8..fae9251 100644 (file)
--- a/drivers/media/dvb-frontends/m88ds3103.c
+++ b/drivers/media/dvb-frontends/m88ds3103.c
@@ -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);
-       if (ret)
-               goto err;
-
-       u8tmp = ((u8tmp  & 0xf0) << 0) | u8tmp1 >> 2;
-       ret = regmap_write(dev->regmap, 0xfe, u8tmp);
+       u8tmp = (u8tmp1 >> 2) & 0x0f;
+       ret = regmap_update_bits(dev->regmap, 0xfe, 0x0f, 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)