amdgpu - strix halo code paths need FP save/restore

[erikarn]

This is from olivier - it looks like some code paths used by strix halo need the explicit save/restore calls.

ocochard@94ee1ec

[emaste]

This was done upstream in:

commit 3539437f354bd24c98928a80d4db3a23fa2a7b19
Author: Rafal Ostrowski <rafal.ostrowski@amd.com>
Date:   Tue Feb 24 15:36:09 2026 +0100

    drm/amd/display: Move FPU Guards From DML To DC - Part 1
    
    [Why]
    FPU guards (DC_FP_START/DC_FP_END) are required to wrap around code that
    can manipulates floats. To do this properly, the FPU guards must be used
    in a file that is not compiled as a FPU unit. If the guards are used in
    a file that is a FPU unit, other sections in the file that aren't guarded
    may be end up being compiled to use FPU operations.
    
    [How]
    Added DC_FP_START and DC_FP_END to DC functions that call DML functions
    using FPU.
    
    Reviewed-by: Dillon Varone <dillon.varone@amd.com>
    Signed-off-by: Rafal Ostrowski <rafal.ostrowski@amd.com>
    Signed-off-by: Alex Hung <alex.hung@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

[emaste]

Note also that there's DC_FP_START/DC_FP_END wrapping in dml2_validate and dml21_validate as of 3d16e38 in our tree. This was moved out in the subsequent commit,

From: Rafal Ostrowski <rafal.ostrowski@amd.com>
Date: Wed, 18 Feb 2026 16:19:47 +0100
Subject: [PATCH 6/8] drm/amd/display: Move FPU Guards From DML To DC - Part 2

[Why]
FPU guards (DC_FP_START/DC_FP_END) are required to wrap around code that
can manipulates floats. To do this properly, the FPU guards must be used
in a file that is not compiled as a FPU unit. If the guards are used in
a file that is a FPU unit, other sections in the file that aren't guarded
may be end up being compiled to use FPU operations.

[How]
Removed DC_FP_START and DC_FP_END.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Rafal Ostrowski <rafal.ostrowski@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Chuanyu Tseng <Chuanyu.Tseng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

@ocochard which version were you testing?

[ocochard]

@ocochard which version were you testing?

I need to use a patched version of drm-latest-kmod:

olivier@framework:~ $ sudo pkg info | grep drm-latest-kmod
drm-latest-kmod-6.12.1600019_1 Direct Rendering Manager (DRM) GPU drivers

[emaste]

Ahh, I see the associated changes are not in the drm_v6.12 tag. For my testing on Strix Halo I've been using a branch on top of drm-kmod master (with no further DC_FP_* changes) without issue.