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media: tc358743: ignore video while HPD is low

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If the HPD is low (happens if there is no EDID or the
EDID is being updated), then return -ENOLINK in
tc358743_get_detected_timings() instead of detecting video.

This avoids userspace thinking that it can start streaming when
the HPD is low.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Tested-by: Maxime Ripard <mripard@kernel.org>
Link: https://lore.kernel.org/linux-media/20240628-stoic-bettong-of-fortitude-e25611@houat/
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2025-04-01 11:54:17 +02:00 committed by Mauro Carvalho Chehab
parent 80a9da00b9
commit 6829c5b5d2
1 changed files with 4 additions and 0 deletions
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4
drivers/media/i2c/tc358743.c
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@ -313,6 +313,10 @@ static int tc358743_get_detected_timings(struct v4l2_subdev *sd,
memset(timings, 0, sizeof(struct v4l2_dv_timings));
/* if HPD is low, ignore any video */
if (!(i2c_rd8(sd, HPD_CTL) & MASK_HPD_OUT0))
return -ENOLINK;
if (no_signal(sd)) {
v4l2_dbg(1, debug, sd, "%s: no valid signal\n", __func__);
return -ENOLINK;