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[media] af9033: implement i/o optimized reg table writer 

Use register address auto increment to reduce I/O when large
register / values tables are written.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Antti Palosaari 2013-03-08 16:54:09 -03:00 committed by Mauro Carvalho Chehab
parent 0c13c54d85
commit 3bf5e55299
1 changed files with 37 additions and 10 deletions
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47
drivers/media/dvb-frontends/af9033.c
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@ -156,6 +156,37 @@ static int af9033_rd_reg_mask(struct af9033_state *state, u32 reg, u8 *val,
return 0;
}
/* write reg val table using reg addr auto increment */
static int af9033_wr_reg_val_tab(struct af9033_state *state,
const struct reg_val *tab, int tab_len)
{
int ret, i, j;
u8 buf[tab_len];
dev_dbg(&state->i2c->dev, "%s: tab_len=%d\n", __func__, tab_len);
for (i = 0, j = 0; i < tab_len; i++) {
buf[j] = tab[i].val;
if (i == tab_len - 1 || tab[i].reg != tab[i + 1].reg - 1) {
ret = af9033_wr_regs(state, tab[i].reg - j, buf, j + 1);
if (ret < 0)
goto err;
j = 0;
} else {
j++;
}
}
return 0;
err:
dev_dbg(&state->i2c->dev, "%s: failed=%d\n", __func__, ret);
return ret;
}
static u32 af9033_div(struct af9033_state *state, u32 a, u32 b, u32 x)
{
u32 r = 0, c = 0, i;
@ -306,11 +337,9 @@ static int af9033_init(struct dvb_frontend *fe)
break;
}
for (i = 0; i < len; i++) {
ret = af9033_wr_reg(state, init[i].reg, init[i].val);
if (ret < 0)
goto err;
}
ret = af9033_wr_reg_val_tab(state, init, len);
if (ret < 0)
goto err;
/* load tuner specific settings */
dev_dbg(&state->i2c->dev, "%s: load tuner specific settings\n",
@ -371,11 +400,9 @@ static int af9033_init(struct dvb_frontend *fe)
goto err;
}
for (i = 0; i < len; i++) {
ret = af9033_wr_reg(state, init[i].reg, init[i].val);
if (ret < 0)
goto err;
}
ret = af9033_wr_reg_val_tab(state, init, len);
if (ret < 0)
goto err;
if (state->cfg.ts_mode == AF9033_TS_MODE_SERIAL) {
ret = af9033_wr_reg_mask(state, 0x00d91c, 0x01, 0x01);