drm/amd/display: Test vline0 irq control

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[WHAT]
The vline0 interrupt handling in amdgpu_dm_crtc_set_vblank() sits
inside a CONFIG_DRM_AMD_SECURE_DISPLAY block. That symbol depends on
CONFIG_DRM_AMD_DC_FP, which cannot be enabled on UML because UML does
not select ARCH_HAS_KERNEL_FPU_SUPPORT, so the logic is never built by
the KUnit tests and stays uncovered.

[HOW]
Move the block into amdgpu_dm_crtc_set_vline0_irq() and build it
whenever CONFIG_DRM_AMD_SECURE_DISPLAY or the KUnit tests are enabled.
The DCN-only check becomes an early return. Behaviour of
amdgpu_dm_crtc_set_vblank() is unchanged.

Add tests for amdgpu_dm_crtc_set_vline0_irq() covering the DCE no-op
path, error propagation from amdgpu_irq_get() and the enable/disable
refcount round-trip.

Assisted-by: Copilot:Claude-Opus-5
Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Alex Hung 2026-08-21 12:24:16 -06:00 • committed by Alex Deucher

parent 285f6b4557

commit 22dbf5c4b2

3 changed files with 129 additions and 13 deletions

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40

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c

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1

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.h

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101

drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_crtc_test.c

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