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

drm/amd/display: Add support for FRL to DC core

2026-06-03T17:44:46+00:00

Here we add support for reading BIOS caps and tie FRL bits into the rest of DC core. Signed-off-by: Harry Wentland Reviewed-by: Fangzhi Zuo Tested-by: Dan Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Add no_native_i2c codepath

2026-06-03T17:43:29+00:00

[Why] ASICs which do not have native DDC capability must use a different codepath to access the AUX channel. [How] - BIOS cap NO_DDC_PIN is set to 1 for links which do not have the DDC pin. - dp_connector_no_native_i2c in dc_config must also be set to true to use this codepath. Reviewed-by: Harry Wentland Signed-off-by: Matthew Stewart Signed-off-by: Ray Wu Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix DP_PIXEL_FORMAT fields & update clk_src for DCN4x

2026-06-03T17:39:58+00:00

[Why & How] The enc1_stream_encoder_dp_get_pixel_format() function reads fields of the DP_PIXEL_FORMAT register that are deprecated on DCN4x. This breaks seamless boot because driver cannot properly determine the pixel format programmed by VBIOS. The previous changed submitted for this issue incorrectly calculated the DP DTO frequency because register access to DCN4x DP DTO registers was not working. Create a new function that reads the correct fields. Update clk_src structs to support register access for new DCN4x registers & fields. Reviewed-by: Charlene Liu Signed-off-by: Ovidiu Bunea Signed-off-by: Ray Wu Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: add missing CSC entries for BT.2020 for DCE IPs

2026-06-03T17:31:32+00:00

DCE-based hardware does not have the CSC matrices for BT.2020, which causes the driver to fallback to the GPU built-in matrices. This does not appear to cause any issues for RGB sinks, but causes major color artifacts for YCbCr ones (e.g. black becomes green). This commit adds the missing CSC matrices (taken from DC common) to DCE CSC tables, resolving the issue. Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/3358 Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/5333 Assisted-by: oh-my-pi:GPT-5.5 Signed-off-by: Leorize Reviewed-by: Alex Hung Signed-off-by: Alex Deucher

drm/amd/display: Update get_pixel_clk_frequency() for DCN4x DCCG DP DTO

2026-06-03T17:31:08+00:00

[Why & How] DCN4x ASICs have different DCCG logic for programming DP DTO. The current get_pixel_clk_frequency_100hz() function does not account for this. Rename the function to "get_dp_dto_frequency" to more accurately reflect its intended behaviour. Create a new function that correctly calculates the target pixel rate for DCN4.x DCCG design and use it. Reviewed-by: Leo Chen Signed-off-by: Ovidiu Bunea Signed-off-by: Ray Wu Signed-off-by: Alex Deucher

drm/amd/display: Refactor dc_link_aux_transfer_raw

2026-05-11T20:10:41+00:00

[Why & How] The logic for choosing between the dce_aux_transfer function variants is moved into dce_aux.c rather than link_ddc.c. The "dce_aux_transfer_with_retries" function now uses dce_aux_transfer_raw in its implementation as the logic is equivalent. Reviewed-by: Nevenko Stupar Reviewed-by: Gabe Teeger Signed-off-by: Matthew Stewart Signed-off-by: James Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher

drm/amd/display: Fix type mismatches using guards and explicit casts

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 iterator and temporary variable types with the semantic type of the compared bounds. Used unsigned indices for loops bounded by unsigned counters and table sizes, while retaining signed types where values are semantically signed or participate in arithmetic that may legitimately go negative. Where mixed signed/unsigned comparisons are intentional, applied explicit boundary casts or guarded comparisons instead of broad type changes. No functional behavior changes are intended; this is a warning-resolution and type-alignment cleanup. Reviewed-by: Dillon Varone Signed-off-by: Gaghik Khachatrian Signed-off-by: James Lin Signed-off-by: Alex Deucher

drm/amd/display: Allow DCE link encoder without AUX registers

2026-04-29T14:28:50+00:00

Allow constructing the DCE link encoder without DDC, which means the AUX registers array will be NULL. This is necessary to support embedded connectors without DDC. Fixes: 4562236b3bc0 ("drm/amd/dc: Add dc display driver (v2)") Link: https://gitlab.freedesktop.org/drm/amd/-/work_items/5192 Signed-off-by: Timur Kristóf 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: Fix implicit narrowing conversion warnings

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

[Why] Multiple display source files contain implicit narrowing conversions when assigning wider integer types (int, uint32_t) to narrower fields (uint8_t, uint16_t) at hardware register, protocol, and storage boundaries. These conversions are intentional but undocumented, and accompanying runtime assertions add noise without providing compile-time safety. [How] Add explicit casts at all intentional narrowing boundaries across display source files. Use narrower loop variable types where loop bounds guarantee safe range. Remove runtime assertions paired with narrowing casts, inline single-use intermediate variables, and revert block scopes and braces introduced solely to contain those assertions. Reviewed-by: Dillon Varone Signed-off-by: Gaghik Khachatrian Signed-off-by: Chenyu Chen Signed-off-by: Alex Deucher