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

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: 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: 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 refresh rate round up case

2026-05-11T20:10:08+00:00

[Why & How] fix refresh rate round up case Reviewed-by: Robin Chen Signed-off-by: ChunTao Tso Signed-off-by: James Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix type mismatches in DC and DMUB modules

2026-05-05T13:56:52+00:00

[Why] Address signed/unsigned comparison warnings across dc paths to keep builds warning-clean and improve type safety at comparison boundaries. Most warnings came from signed loop/index temporaries compared against unsigned counters and table sizes, plus a smaller number of mixed signed/unsigned clock, bandwidth, and geometry comparisons. [How] Aligned loop/index and bound types in the affected modules and DMUB sources, including color, freesync, power, stats, and vmid paths. Used unsigned iterators where bounds/counters are unsigned, preserved signed types where negative values are meaningful, and updated related format specifiers where type changes required it. Changes are limited to warning resolution and type alignment. No functional behavior change is intended. Reviewed-by: Dillon Varone Signed-off-by: Gaghik Khachatrian Signed-off-by: James Lin Signed-off-by: Alex Deucher

drm/amd/display: Rename backlight_properties to pwr_backlight_properties

2026-05-05T13:56:52+00:00

[Why] 'struct backlight_properties' in power.c has the same name as the kernel's struct defined in . In out-of-tree backport build environments, the header is forcefully injected via command-line includes, causing a redefinition error. [How] Rename the file-local 'struct backlight_properties' to 'pwr_backlight_properties' to avoid the name collision. No functional change. Reviewed-by: Tom Chung Signed-off-by: Ray Wu Signed-off-by: James Lin Signed-off-by: Alex Deucher

drm/amd/display: Fix divide by zero in calc_psr_num_static_frames

2026-04-24T14:52:04+00:00

calc_psr_num_static_frames() divides by vsync_rate_hz before checking whether it is zero: frame_time_microsec = 1000000 / vsync_rate_hz; This can trigger a divide-by-zero bug if an invalid refresh rate is passed in. Rewrite the calculation to directly compute the number of frames needed for at least 30 ms using DIV_ROUND_UP(). This avoids the invalid divisor and removes the temporary frame_time_microsec calculation. Keep the existing fallback behavior of 2 static frames when vsync_rate_hz is zero. Fixes: 4cef2ac4c795 ("drm/amd/display: Introduce power module on Linux") Reported-by: Dan Carpenter Cc: Leo Li Cc: Ray Wu Cc: Chenyu Chen Signed-off-by: Srinivasan Shanmugam Reviewed-by: Leo Li Signed-off-by: Alex Deucher

drm/amd/display: Fix narrowing boundaries and eDP parser assignment

2026-04-17T19:41:16+00:00

[Why] drm/amd/display had implicit integer narrowing at protocol/storage boundaries and an incomplete eDP assignment in integrated info parsing. [How] Apply explicit boundary casts for intentional narrowing, keep intermediate math in wider types, and restore explicit eDP field mapping in v2.2 parser. Reviewed-by: Dillon Varone Signed-off-by: Gaghik Khachatrian Signed-off-by: Chenyu Chen Signed-off-by: Alex Deucher

drm/amd/display: Introduce power module on Linux

2026-04-17T19:41:15+00:00

[Why] Other OS supported by DC uses the power module to manage panel power features such as backlight and self-refresh. It contains enhancements on top what amdgpu_dm is doing today that can benefit power. [How] Introduce the power module. It's currently not being used anywhere, a future change will incorporate it into amdgpu_dm. Reviewed-by: Leo Li Signed-off-by: Ray Wu Signed-off-by: Leo Li Signed-off-by: Chenyu Chen Signed-off-by: Alex Deucher