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[media] ad9389b: retry setup if the state is inconsistent

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Retry setup if the device is powered off when it should be powered on. This
state can be caused by rapid hotplug toggles.

Signed-off-by: Martin Bugge <marbugge@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:
Martin Bugge 2013-12-10 09:00:05 -03:00 committed by Mauro Carvalho Chehab
parent 51af70bf93
commit a6c98f56e7
1 changed files with 26 additions and 1 deletions
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27
drivers/media/i2c/ad9389b.c
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@ -904,7 +904,7 @@ static void ad9389b_notify_monitor_detect(struct v4l2_subdev *sd)
v4l2_subdev_notify(sd, AD9389B_MONITOR_DETECT, (void *)&mdt);
}
static void ad9389b_check_monitor_present_status(struct v4l2_subdev *sd)
static void ad9389b_update_monitor_present_status(struct v4l2_subdev *sd)
{
struct ad9389b_state *state = get_ad9389b_state(sd);
/* read hotplug and rx-sense state */
@ -947,6 +947,31 @@ static void ad9389b_check_monitor_present_status(struct v4l2_subdev *sd)
ad9389b_s_ctrl(state->hdmi_mode_ctrl);
}
static void ad9389b_check_monitor_present_status(struct v4l2_subdev *sd)
{
struct ad9389b_state *state = get_ad9389b_state(sd);
int retry = 0;
ad9389b_update_monitor_present_status(sd);
/*
* Rapid toggling of the hotplug may leave the chip powered off,
* even if we think it is on. In that case reset and power up again.
*/
while (state->power_on && (ad9389b_rd(sd, 0x41) & 0x40)) {
if (++retry > 5) {
v4l2_err(sd, "retried %d times, give up\n", retry);
return;
}
v4l2_dbg(1, debug, sd, "%s: reset and re-check status (%d)\n", __func__, retry);
ad9389b_notify_monitor_detect(sd);
cancel_delayed_work_sync(&state->edid_handler);
memset(&state->edid, 0, sizeof(struct ad9389b_state_edid));
ad9389b_s_power(sd, false);
ad9389b_update_monitor_present_status(sd);
}
}
static bool edid_block_verify_crc(u8 *edid_block)
{
u8 sum = 0;