diff options
| author | Antti Palosaari <crope@iki.fi> | 2013-12-02 21:08:53 +0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-12-19 15:23:04 +0400 |
| commit | 06487dee53ae1574fb9637a4c243287ea92ab69d (patch) | |
| tree | 48f9136de25e89329966fe7cd805f67736c3c1ea /drivers/media/dvb-frontends/m88ds3103.c | |
| parent | dcaf0fbfd2fa5a36e6e1150576f7a8c3efc43f92 (diff) | |
| download | linux-06487dee53ae1574fb9637a4c243287ea92ab69d.tar.xz | |
[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: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/dvb-frontends/m88ds3103.c')
| -rw-r--r-- | drivers/media/dvb-frontends/m88ds3103.c | 43 |
1 files changed, 36 insertions, 7 deletions
diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c index f9d896767887..76bd85aa8f4e 100644 --- a/drivers/media/dvb-frontends/m88ds3103.c +++ b/drivers/media/dvb-frontends/m88ds3103.c @@ -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 */ |