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Commit 06487dee authored by Antti Palosaari's avatar Antti Palosaari Committed by Mauro Carvalho Chehab
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[media] m88ds3103: I/O optimize inittab write 



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

Signed-off-by: default avatarAntti Palosaari <crope@iki.fi>
Signed-off-by: default avatarMauro Carvalho Chehab <m.chehab@samsung.com>
parent dcaf0fbf

drivers/media/dvb-frontends/m88ds3103.c

+36 −7
Original line number Diff line number Diff line
@@ -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];
@@ -308,13 +340,10 @@ 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);

		ret = m88ds3103_wr_reg_val_tab(priv, init, len);

		if (ret)

			goto err;

	}

	}



	u8tmp1 = 0; /* silence compiler warning */

	switch (priv->cfg->ts_mode) {