From: Mats Randgaard <matra...@cisco.com> ADV7604_FMT_CHANGE events was debounced in adv7604_isr() to avoid that a receiver with a unstable input signal would block the event handling for other inputs. This solution was prone to errors.
A better protection agains interrupt blocking is to delay the call of the interrupt service routine in the adv7604 driver if too many interrupts are received within a given time. Signed-off-by: Mats Randgaard <matra...@cisco.com> Signed-off-by: Hans Verkuil <hans.verk...@cisco.com> --- drivers/media/i2c/adv7604.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) diff --git a/drivers/media/i2c/adv7604.c b/drivers/media/i2c/adv7604.c index fa98229..50f0279 100644 --- a/drivers/media/i2c/adv7604.c +++ b/drivers/media/i2c/adv7604.c @@ -78,7 +78,6 @@ struct adv7604_state { struct workqueue_struct *work_queues; struct delayed_work delayed_work_enable_hotplug; bool restart_stdi_once; - u32 prev_input_status; /* i2c clients */ struct i2c_client *i2c_avlink; @@ -1524,9 +1523,7 @@ static int adv7604_g_mbus_fmt(struct v4l2_subdev *sd, 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; v4l2_dbg(2, debug, sd, "%s: ", __func__); @@ -1534,22 +1531,17 @@ static int adv7604_isr(struct v4l2_subdev *sd, u32 status, bool *handled) fmt_change = io_read(sd, 0x43) & 0x98; if (fmt_change) io_write(sd, 0x44, fmt_change); + fmt_change_digital = is_digital_input(sd) ? (io_read(sd, 0x6b) & 0xc0) : 0; if (fmt_change_digital) io_write(sd, 0x6c, fmt_change_digital); + if (fmt_change || fmt_change_digital) { v4l2_dbg(1, debug, sd, "%s: fmt_change = 0x%x, fmt_change_digital = 0x%x\n", __func__, fmt_change, fmt_change_digital); - 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); - } + v4l2_subdev_notify(sd, ADV7604_FMT_CHANGE, NULL); if (handled) *handled = true; @@ -2129,7 +2121,6 @@ static int adv7604_probe(struct i2c_client *client, /* initialize variables */ state->restart_stdi_once = true; - state->prev_input_status = ~0; state->selected_input = ~0; /* platform data */ -- 1.8.4.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html