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authorAntti Palosaari <crope@iki.fi>2013-03-08 16:54:09 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-03-21 19:06:00 -0300
commit3bf5e55299ac5a389a4e6b9991f900579a765172 (patch)
tree382b4a698493a3d57896c553b3e27f21ff5e5ff1 /drivers/media/dvb-frontends
parent0c13c54d8527df03decf7c522f35886fb721f282 (diff)
downloadvexpress-lsk-3bf5e55299ac5a389a4e6b9991f900579a765172.tar.gz
[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>
Diffstat (limited to 'drivers/media/dvb-frontends')
-rw-r--r--drivers/media/dvb-frontends/af9033.c47
1 files changed, 37 insertions, 10 deletions
diff --git a/drivers/media/dvb-frontends/af9033.c b/drivers/media/dvb-frontends/af9033.c
index 2dba516d568..a777b4b944e 100644
--- a/drivers/media/dvb-frontends/af9033.c
+++ b/drivers/media/dvb-frontends/af9033.c
@@ -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);