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media: i2c: adv7604/tc358743/tda1997x: HPD low for HZ / 7

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When the EDID is updated, the hotplug detect signal must remain low for
100 ms minimum. Currently these three drivers use that exact minimum,
but some HDMI transmitters need the HPD to be low for a bit longer
before they detect that they need to read the EDID again.

Experience shows that HZ / 7 (= 143 ms) is a good value.

So change HZ / 10 to HZ / 7.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Hans Verkuil 2025-06-25 08:35:36 +02:00 committed by Mauro Carvalho Chehab
parent a8598c7de1
commit 5bcc50cb55
3 changed files with 6 additions and 6 deletions
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4
drivers/media/i2c/adv7604.c
View File

@ -2448,8 +2448,8 @@ static int adv76xx_set_edid(struct v4l2_subdev *sd, struct v4l2_edid *edid)
}
cec_s_phys_addr(state->cec_adap, parent_pa, false);
/* enable hotplug after 100 ms */
schedule_delayed_work(&state->delayed_work_enable_hotplug, HZ / 10);
/* enable hotplug after 143 ms */
schedule_delayed_work(&state->delayed_work_enable_hotplug, HZ / 7);
return 0;
}

4
drivers/media/i2c/tc358743.c
View File

@ -437,9 +437,9 @@ static void tc358743_enable_edid(struct v4l2_subdev *sd)
v4l2_dbg(2, debug, sd, "%s:\n", __func__);
/* Enable hotplug after 100 ms. DDC access to EDID is also enabled when
/* Enable hotplug after 143 ms. DDC access to EDID is also enabled when
* hotplug is enabled. See register DDC_CTL */
schedule_delayed_work(&state->delayed_work_enable_hotplug, HZ / 10);
schedule_delayed_work(&state->delayed_work_enable_hotplug, HZ / 7);
tc358743_enable_interrupts(sd, true);
tc358743_s_ctrl_detect_tx_5v(sd);

4
drivers/media/i2c/tda1997x.c
View File

@ -589,8 +589,8 @@ static void tda1997x_enable_edid(struct v4l2_subdev *sd)
v4l2_dbg(1, debug, sd, "%s\n", __func__);
/* Enable hotplug after 100ms */
schedule_delayed_work(&state->delayed_work_enable_hpd, HZ / 10);
/* Enable hotplug after 143ms */
schedule_delayed_work(&state->delayed_work_enable_hpd, HZ / 7);
}
/* -----------------------------------------------------------------------------