linux/drivers/gpu/drm/amd/display/dc/link/protocols, branch master

drm/amd/display: Fixed Silence complier warnings in dc

2026-03-30T19:12:15Z

[Why] Resolve compiler warnings by marking unused parameters explicitly. [How] In .c and .h function definitions, keep parameter names in signatures and add a line with `(void)param;` in function body Preserved function signatures and avoids breaking code paths that may reference the parameter under conditional compilation. Reviewed-by: Dillon Varone Reviewed-by: Austin Zheng Signed-off-by: Gaghik Khachatrian Signed-off-by: Chuanyu Tseng Signed-off-by: Alex Deucher

drm/amd/display: Enable dcn42 DC clk_mgr

2026-03-11T17:58:06Z

Add support for DCN 4.2 clock manager. Acked-by: Aurabindo Pillai Signed-off-by: Roman Li Signed-off-by: Alex Hung Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Clean up unused code

2026-03-11T17:58:06Z

[WHAT] Silence warning by cleaning up unused code. Reviewed-by: Dillon Varone Signed-off-by: Clay King Signed-off-by: Alex Hung Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Add ESD detection for replay recovery

2026-03-11T14:56:00Z

[HOW] Add Replay recovery flow so that when HPD occurs and ESD is detected, Replay can restore the system back to normal. Reviewed-by: Wenjing Liu Reviewed-by: Robin Chen Reviewed-by: Aric Cyr Signed-off-by: Weiguang Li Signed-off-by: Alex Hung Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Return early from vesa replay enable function

2026-03-11T14:53:20Z

[WHY & HOW] If the enable state is already as expect then just return. Reviewed-by: Robin Chen Reviewed-by: Wenjing Liu Signed-off-by: Peichen Huang Signed-off-by: Alex Hung Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Initialize replay_state to PR_STATE_INVALID

2026-03-02T21:39:02Z

[WHY & HOW] Initialize the replay_state variable to PR_STATE_INVALID instead of PR_STATE_0 before retrieving the actual replay state. Reviewed-by: Wenjing Liu Signed-off-by: Ivan Lipski Signed-off-by: Alex Hung Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix DPIA number and driver ID field issue

2026-02-23T19:39:31Z

[Why] The DPIA number field is 6 bits in the spec. In dp_type, it only defines 5 bits. The driver ID is only 4 bits in the spec. [How] Set DPIA number field size to 6. And only update 4 bits for driver id. Reviewed-by: Meenakshikumar Somasundaram Signed-off-by: Cruise Hung Signed-off-by: Ivan Lipski Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Link detection for external DP bridge encoders

2026-02-23T19:28:32Z

Deal with some minor idiosyncracies of TRAVIS and NUTMEG chips. - Always use DP signal type with these chips so that the normal DP code paths can work with them without a major refactor of the code base. Properly set this. - NUTMEG seems to only work with HBR, not RBR, so set a preferred link rate for this chip. See amdgpu_atombios_dp_get_dp_link_config() for reference. - NUTMEG is recognized as a DP branch device but reports 0 sinks, which is wrong and confuses DC (it hits an early return). Fix that by hardcoding the sink count to 1. - Fixup old DC code selecting a special panel mode necessary for NUTMEG and TRAVIS. Signed-off-by: Timur Kristóf Reviewed-by: Alex Hung Signed-off-by: Alex Deucher

drm/amd/display: Use preferred DP link rate if specified

2026-02-23T19:28:32Z

The DisplayPort code already has the concept of preferred link settings, but it only allows setting a preferred lane count and link width at the same time. It does not consider the possiblity that some devices may not work on lower link rates but may support various lane counts. Allow specifying a preferred link rate which will be used as the initial link rate when deciding the DP link settings. This is necessary to support NUTMEG which only works with HBR but not with RBR. For reference, see the legacy non-DC amdgpu display code: amdgpu_atombios_dp_get_dp_link_config() Signed-off-by: Timur Kristóf Reviewed-by: Alex Hung Signed-off-by: Alex Deucher

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51Z

This was done entirely with mindless brute force, using git grep -l '\