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[media] m88ds3103: I/O optimize inittab write

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Write inittab using reg address auto-increment in order to reduce
I/O a little bit.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Antti Palosaari 2013-12-02 14:08:53 -03:00 committed by Mauro Carvalho Chehab
parent dcaf0fbfd2
commit 06487dee53
1 changed files with 36 additions and 7 deletions
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43
drivers/media/dvb-frontends/m88ds3103.c
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@ -157,6 +157,38 @@ static int m88ds3103_rd_reg_mask(struct m88ds3103_priv *priv,
return 0;
}
/* write reg val table using reg addr auto increment */
static int m88ds3103_wr_reg_val_tab(struct m88ds3103_priv *priv,
const struct m88ds3103_reg_val *tab, int tab_len)
{
int ret, i, j;
u8 buf[83];
dev_dbg(&priv->i2c->dev, "%s: tab_len=%d\n", __func__, tab_len);
if (tab_len > 83) {
ret = -EINVAL;
goto err;
}
for (i = 0, j = 0; i < tab_len; i++, j++) {
buf[j] = tab[i].val;
if (i == tab_len - 1 || tab[i].reg != tab[i + 1].reg - 1 ||
!((j + 1) % (priv->cfg->i2c_wr_max - 1))) {
ret = m88ds3103_wr_regs(priv, tab[i].reg - j, buf, j + 1);
if (ret)
goto err;
j = -1;
}
}
return 0;
err:
dev_dbg(&priv->i2c->dev, "%s: failed=%d\n", __func__, ret);
return ret;
}
static int m88ds3103_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
struct m88ds3103_priv *priv = fe->demodulator_priv;
@ -214,7 +246,7 @@ static int m88ds3103_set_frontend(struct dvb_frontend *fe)
{
struct m88ds3103_priv *priv = fe->demodulator_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret, i, len;
int ret, len;
const struct m88ds3103_reg_val *init;
u8 u8tmp, u8tmp1, u8tmp2;
u8 buf[2];
@ -308,12 +340,9 @@ static int m88ds3103_set_frontend(struct dvb_frontend *fe)
/* program init table */
if (c->delivery_system != priv->delivery_system) {
dev_dbg(&priv->i2c->dev, "%s: program init\n", __func__);
for (i = 0; i < len; i++) {
ret = m88ds3103_wr_reg(priv, init[i].reg, init[i].val);
if (ret)
goto err;
}
ret = m88ds3103_wr_reg_val_tab(priv, init, len);
if (ret)
goto err;
}
u8tmp1 = 0; /* silence compiler warning */