[media] adv7604: debounce "format change" notifications

The bridge driver is only notified when the input status has changed
since the previous interrupt.

Signed-off-by: Mats Randgaard <matrandg@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 17 insertions, 3 deletions

diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c
index 3ec7ec0911ca..d093092988f8 100644
--- a/drivers/media/i2c/adv7604.c
+++ b/drivers/media/i2c/adv7604.c
@@ -77,6 +77,7 @@ struct adv7604_state {
         struct delayed_work delayed_work_enable_hotplug;
         bool connector_hdmi;
         bool restart_stdi_once;
+        u32 prev_input_status;
 
         /* i2c clients */
         struct i2c_client *i2c_avlink;
@@ -1535,6 +1536,7 @@ static int adv7604_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
 {
         struct adv7604_state *state = to_state(sd);
         u8 fmt_change, fmt_change_digital, tx_5v;
+        u32 input_status;
 
         /* format change */
         fmt_change = io_read(sd, 0x43) & 0x98;
@@ -1545,9 +1547,18 @@ static int adv7604_isr(struct v4l2_subdev *sd, u32 status, bool *handled)
                 io_write(sd, 0x6c, fmt_change_digital);
         if (fmt_change || fmt_change_digital) {
                 v4l2_dbg(1, debug, sd,
-                        "%s: ADV7604_FMT_CHANGE, fmt_change = 0x%x, fmt_change_digital = 0x%x\n",
+                        "%s: fmt_change = 0x%x, fmt_change_digital = 0x%x\n",
                         __func__, fmt_change, fmt_change_digital);
-                v4l2_subdev_notify(sd, ADV7604_FMT_CHANGE, NULL);
+
+                adv7604_g_input_status(sd, &input_status);
+                if (input_status != state->prev_input_status) {
+                        v4l2_dbg(1, debug, sd,
+                                "%s: input_status = 0x%x, prev_input_status = 0x%x\n",
+                                __func__, input_status, state->prev_input_status);
+                        state->prev_input_status = input_status;
+                        v4l2_subdev_notify(sd, ADV7604_FMT_CHANGE, NULL);
+                }
+
                 if (handled)
                         *handled = true;
         }
@@ -1953,6 +1964,10 @@ static int adv7604_probe(struct i2c_client *client,
                 return -ENOMEM;
         }
 
+        /* initialize variables */
+        state->restart_stdi_once = true;
+        state->prev_input_status = ~0;
+
         /* platform data */
         if (!pdata) {
                 v4l_err(client, "No platform data!\n");
@@ -2036,7 +2051,6 @@ static int adv7604_probe(struct i2c_client *client,
                 v4l2_err(sd, "failed to create all i2c clients\n");
                 goto err_i2c;
         }
-        state->restart_stdi_once = true;
 
         /* work queues */
         state->work_queues = create_singlethread_workqueue(client->name);