kernel/linux.git/drivers/gpu/drm/amd/display/modules, branch v7.2-rc1

drm/amd/display: Add missing kdoc for ALLM parameters

2026-06-03T17:45:53+00:00

Add descriptions for the missing parameters for ALLMEnabled and ALLMValue to keep the function documentation synchronized with the function prototype mod_build_hf_vsif_infopacket(). Fixes the below with gcc W=1: ../display/modules/info_packet/info_packet.c:507 function parameter 'ALLMEnabled' not described in 'mod_build_hf_vsif_infopacket' ../display/modules/info_packet/info_packet.c:507 function parameter 'ALLMValue' not described in 'mod_build_hf_vsif_infopacket' Fixes: 3c2381b92cba ("drm/amd/display: add support for VSIP info packet") Cc: Roman Li Cc: Alex Hung Cc: Tom Chung Cc: Aurabindo Pillai Cc: Wayne Lin Cc: Nicholas Kazlauskas Cc: Bhawanpreet Lakha Signed-off-by: Srinivasan Shanmugam Reviewed-by: Alex Hung Signed-off-by: Alex Deucher

drm/amd/display: Update HDCP and info_packet modules for FRL

2026-06-03T17:44:49+00:00

The HDCP module has a minor update for FRL, and info_packet is updated for ALLM. Signed-off-by: Harry Wentland Reviewed-by: Fangzhi Zuo Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Handle aux_inst for connectors without DDC pin

2026-06-03T17:43:42+00:00

[Why & How] Must use an alternative codepath to access AUX channel when link->no_ddc_pin is set. Reviewed-by: Harry Wentland Signed-off-by: Gabe Teeger Signed-off-by: Matthew Stewart Signed-off-by: Ray Wu Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size

2026-06-03T17:38:01+00:00

[Why & How] During HDCP 2.x repeater authentication over HDMI, the driver reads the sink's RxStatus register and extracts a 10-bit message size field (max value 1023). This value is used as the read length for the ReceiverID list without being clamped to the size of the destination buffer rx_id_list[177]. A malicious HDMI repeater could advertise a message size larger than the buffer, causing an out-of-bounds write during the I2C read. Clamp the read length in mod_hdcp_read_rx_id_list() to the size of the rx_id_list buffer, matching the approach already used in the DP branch. Fixes: eff682f83c9c ("drm/amd/display: Add DDC handles for HDCP2.2") Assisted-by: Copilot:claude-opus-4.6 Reviewed-by: Alex Hung Signed-off-by: Harry Wentland Signed-off-by: Ray Wu Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Refactor Replay functionality into dedicated power_replay module

2026-05-19T15:45:41+00:00

[Why] Extract all Replay related functions from power.c and power_helpers.c into a new power_replay.c module for better code organization and maintainability. [How] Create new power_replay.c file containing Replay-related functions moved from power.c and power_helpers.c . Update mod_power.h with function declarations. Maintain forward declaration for type compatibility. Reviewed-by: Robin Chen Signed-off-by: Lohita Mudimela Signed-off-by: Ivan Lipski Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Refactor PSR functionality into dedicated power_psr module

2026-05-19T15:45:40+00:00

[Why] Extract all PSR (Panel Self Refresh) related functions from power.c into a new power_psr.c module for better code organization and maintainability. [How] Create new power_psr.c file containing all PSR-related functions moved from power.c. Remove static qualifier from shared functions to enable cross-file access: - psr_context_to_mod_power_psr_context: Convert PSR context to module power PSR context - map_index_from_stream: Map stream to power entity index - delay_two_frames: Wait for two frame periods Add function declarations to header. Maintain forward declaration of struct core_power for type compatibility. Reviewed-by: Anthony Koo Signed-off-by: Lohita Mudimela Signed-off-by: Ivan Lipski Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix enum decl warnings

2026-05-11T20:11:03+00:00

[Why] warnings were triggered by enum forward declarations that are not valid in C++ without an explicit underlying type. [How] - Replace problematic enum forward declarations with C++-safe forms where applicable. - Use plain integer types for interface-only declarations that do not require strong enum typing. - Update dependent winterface signatures and related type usage consistently. - Add required include and type-visibility fixes to avoid follow-on parse and type-resolution issues. Reviewed-by: Aric Cyr Signed-off-by: Gaghik Khachatrian Signed-off-by: James Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Separate ABM functions into dedicated power_abm.c file

2026-05-11T20:10:51+00:00

[Why] Improves code organization by separating Adaptive Backlight Modulation functionality from general power management. This modular approach enhances maintainability and makes the codebase easier to navigate. [How] Create new power_abm.c file containing all ABM-related functions moved from power.c. Remove static qualifier from shared functions to enable cross-file access: - initialize_backlight_caps: Initialize backlight capabilities - validate_ext_backlight_caps: Validate external backlight capabilities - backlight_millipercent_to_pwm: Convert brightness percent to PWM - backlight_millipercent_to_millinit: Convert brightness percent to nits - fill_backlight_level_params: Populate backlight level parametersAdd function declarations to mod_power.h header. Update CMakeLists.txt to include power_abm.c in build. Maintain forward declaration of struct core_power for type compatibility. Rename struct core_power field from 'public' to 'mod_public'. Move internal structures (backlight_state, backlight_properties, dmcu_varibright_cached_properties, core_power) to power_helpers.h to ensure consistent memory layouts across compilation units. Reviewed-by: Martin Leung Signed-off-by: Lohita Mudimela Signed-off-by: James Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix warnings

2026-05-11T20:10:34+00:00

[Why & How] Fix various warnings related to unsigned/signed mismatches - Consistently use the same signedness for a given value - Explcitly cast between types when needed Reviewed-by: Dillon Varone Signed-off-by: Clay King Signed-off-by: James Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix multiple compiler warnings

2026-05-11T20:10:30+00:00

[Why] Unreachable Code; Copy Constructor Deleted; Local Declaration Hides Parameter; Local Declaration Hides Outer Scope; Uninitialized or Suspicious Memory Use. [How] - Removed or refactored unreachable code paths - Ensured proper copy constructors in C++ classes - Renamed local variables that shadowed function parameters - Renamed inner loop/block variables to avoid shadowing outer scope Fixed in 8 files across several FPU layers Also fixed in color_gamma and cs_funcs modules - Reordered guard conditions to validate pipe type before accessing stream - Ensures safe memory access patterns in DC DMUB service layer All changes maintain backward compatibility and preserve functional behavior. Reviewed-by: Dillon Varone Signed-off-by: Gaghik Khachatrian Signed-off-by: James Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher