[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>

1 files changed, 37 insertions, 10 deletions

diff --git a/drivers/media/dvb-frontends/af9033.c b/drivers/media/dvb-frontends/af9033.c
index 2dba516d5680..a777b4b944eb 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);