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drm/amd/display: Add an hdmi_hpd_debounce_delay_ms module

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[Why&How]
Right now, the HDMI HPD filter is enabled by default at 1500ms.

We want to disable it by default, as most modern displays with HDMI do
not require it for DPMS mode.

The HPD can instead be enabled as a driver parameter with a custom delay
value in ms (up to 5000ms).

Fixes: c918e75e1e ("drm/amd/display: Add an HPD filter for HDMI")
Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4859
Signed-off-by: Ivan Lipski <ivan.lipski@amd.com>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Ivan Lipski
2026-01-13 17:29:59 -05:00
committed by Alex Deucher
parent 0cba5b27f1
commit 6a681cd903
4 changed files with 29 additions and 4 deletions
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15
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -8961,9 +8961,18 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
mutex_init(&aconnector->hpd_lock);
mutex_init(&aconnector->handle_mst_msg_ready);
aconnector->hdmi_hpd_debounce_delay_ms = AMDGPU_DM_HDMI_HPD_DEBOUNCE_MS;
INIT_DELAYED_WORK(&aconnector->hdmi_hpd_debounce_work, hdmi_hpd_debounce_work);
aconnector->hdmi_prev_sink = NULL;
/*
* If HDMI HPD debounce delay is set, use the minimum between selected
* value and AMDGPU_DM_MAX_HDMI_HPD_DEBOUNCE_MS
*/
if (amdgpu_hdmi_hpd_debounce_delay_ms) {
aconnector->hdmi_hpd_debounce_delay_ms = min(amdgpu_hdmi_hpd_debounce_delay_ms,
AMDGPU_DM_MAX_HDMI_HPD_DEBOUNCE_MS);
INIT_DELAYED_WORK(&aconnector->hdmi_hpd_debounce_work, hdmi_hpd_debounce_work);
aconnector->hdmi_prev_sink = NULL;
} else {
aconnector->hdmi_hpd_debounce_delay_ms = 0;
}
/*
* configure support HPD hot plug connector_>polled default value is 0