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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>
(cherry picked from commit 6a681cd903)
This commit is contained in:
Ivan Lipski
2026-01-13 17:29:59 -05:00
committed by Alex Deucher
parent b2426a211d
commit d04f73668b
4 changed files with 29 additions and 4 deletions
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11
drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
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@@ -247,6 +247,7 @@ int amdgpu_damage_clips = -1; /* auto */
int amdgpu_umsch_mm_fwlog;
int amdgpu_rebar = -1; /* auto */
int amdgpu_user_queue = -1;
uint amdgpu_hdmi_hpd_debounce_delay_ms;
DECLARE_DYNDBG_CLASSMAP(drm_debug_classes, DD_CLASS_TYPE_DISJOINT_BITS, 0,
"DRM_UT_CORE",
@@ -1123,6 +1124,16 @@ module_param_named(rebar, amdgpu_rebar, int, 0444);
MODULE_PARM_DESC(user_queue, "Enable user queues (-1 = auto (default), 0 = disable, 1 = enable, 2 = enable UQs and disable KQs)");
module_param_named(user_queue, amdgpu_user_queue, int, 0444);
/*
* DOC: hdmi_hpd_debounce_delay_ms (uint)
* HDMI HPD disconnect debounce delay in milliseconds.
*
* Used to filter short disconnect->reconnect HPD toggles some HDMI sinks
* generate while entering/leaving power save. Set to 0 to disable by default.
*/
MODULE_PARM_DESC(hdmi_hpd_debounce_delay_ms, "HDMI HPD disconnect debounce delay in milliseconds (0 to disable (by default), 1500 is common)");
module_param_named(hdmi_hpd_debounce_delay_ms, amdgpu_hdmi_hpd_debounce_delay_ms, uint, 0644);
/* These devices are not supported by amdgpu.
* They are supported by the mach64, r128, radeon drivers
*/