linux/drivers/gpu/drm/amd/display/dc/bios, 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: bios_parser: fix GPIO I2C line off-by-one

2026-03-30T18:39:18Z

get_gpio_i2c_info() computes the number of GPIO I2C assignment records present in the BIOS table and then uses bfI2C_LineMux as an array index into header->asGPIO_Info[]. The current check only rejects values strictly larger than the record count, so an index equal to count still falls through and reaches the fixed table one element past the end. Reject indices at or above the number of available records before using them as an array index. Signed-off-by: Pengpeng Hou Signed-off-by: Alex Deucher

drm/amd/display: Sync dcn42 with DC 3.2.373

2026-03-11T17:58:07Z

This patch provides a bulk merge to align driver support for DCN42 with Display Core version 3.2.373. It includes upgrade for: - clk_mgr - dml2/dml21 - optc - hubp - mpc - optc - hwseq 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: Enable dcn42 DC

2026-02-23T19:28:33Z

Add support for DCN 4.2 in Display Core Signed-off-by: Roman Li Acked-by: Harry Wentland Signed-off-by: Alex Deucher

drm/amd/display: Implement DAC load detection on external DP bridge encoders

2026-02-23T19:28:32Z

Use the pre-existing implementation in the BIOS parser, but call the ExternalEncoderControl function for external encoders instead of the built-in DAC load detection function. Signed-off-by: Timur Kristóf Reviewed-by: Alex Hung Signed-off-by: Alex Deucher

drm/amd/display: Implement BIOS parser external encoder control

2026-02-23T19:28:32Z

The VBIOS has a function called ExternalEncoderControl which controls the DP bridge encoders that some GPUs use for analog and LVDS output. Fixup this old functionality. For reference, see the legacy non-DC amdgpu display code: amdgpu_atombios_encoder_setup_external_encoder() - Set same parameters for the ENABLE action as the SETUP action - Add missing enum values for DDC setup and DAC load detection - Fix the bits per color field - Clarify the code that sets the link rate - Expose the function so that it can be called by rest of DC A subsequent commit will call this function from DCE HWSS. Signed-off-by: Timur Kristóf Reviewed-by: Alex Hung Signed-off-by: Alex Deucher

drm/amd/display: Refactor DAC load detection, move to HWSS

2026-02-23T19:28:32Z

Slightly refactor and simplify DAC load detection. This prepares the code to be used for also executing DAC load detection on external DP bridge encoders. DAC load detection belongs better in the hardware sequencer code because the implementation is HW dependent and not all chips support the functionality. The code is cleaner when link detection probably doesn't call the VBIOS directly. Signed-off-by: Timur Kristóf Reviewed-by: Alex Hung Signed-off-by: Alex Deucher

drm/amd/display: Add color depth helper function to BIOS parser

2026-02-23T19:28:31Z

To improve consistency and avoid duplicating the same code. Also, properly handle all enum values where they weren't handled correctly before. 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 '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28Z

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook