[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>

diff --git a/drivers/media/dvb-frontends/af9033.c b/drivers/media/dvb-frontends/af9033.c
index 2dba516d568006c65545f62f0ae4818e4f97d3a0..a777b4b944eb368f17ebe360ae37b989c2718e19 100644 (file)
--- 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);