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[media] adv7604: remove debouncing of ADV7604_FMT_CHANGE events 

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 <matrandg@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Mats Randgaard 2013-12-05 10:26:11 -03:00 committed by Mauro Carvalho Chehab
parent ff4f80fdfa
commit 14d0323351
1 changed files with 3 additions and 12 deletions
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15
drivers/media/i2c/adv7604.c
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@ -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 */