media: adv7180: Default to the first valid input

The hardware default is differential CVBS on AIN1 & 2, which
isn't very useful.

Select the first input that is defined as valid for the
chip variant (typically CVBS_AIN1).

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>

diff --git a/drivers/media/i2c/adv7180.c b/drivers/media/i2c/adv7180.c
index 4498d14..e98dd2b 100644 (file)
--- a/drivers/media/i2c/adv7180.c
+++ b/drivers/media/i2c/adv7180.c
@@ -1259,6 +1259,7 @@ static const struct adv7180_chip_info adv7282_m_info = {
 static int init_device(struct adv7180_state *state)
 {
        int ret;
+       int i;
 
        mutex_lock(&state->mutex);
 
@@ -1305,6 +1306,18 @@ static int init_device(struct adv7180_state *state)
                        goto out_unlock;
        }
 
+       /* Select first valid input */
+       for (i = 0; i < 32; i++) {
+               if (BIT(i) & state->chip_info->valid_input_mask) {
+                       ret = state->chip_info->select_input(state, i);
+
+                       if (ret == 0) {
+                               state->input = i;
+                               break;
+                       }
+               }
+       }
+
 out_unlock:
        mutex_unlock(&state->mutex);