drm/amd/display: Add MALL status readback support for DCN 4.0.1

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[why]
The IGT test igt@amdgpu/amd_mall@static-screen always fails on DCN 4.0.1
 because debugfs reports "mall enabled: no" even when MALL is
actually active. This is because the DCN 4.0.1 hubbub function table is
missing the .get_mall_en callback, so capabilities_show() always sees
mall_in_use as false.

[how]
Reuse hubbub32_get_mall_en() for DCN 4.0.1 since the DCHUBBUB_ARB_MALL_CNTL
register layout is identical to DCN 3.2:
- Register the DCHUBBUB_ARB_MALL_CNTL register offset in dcn401_resource.h
- Add MALL_PREFETCH_COMPLETE and MALL_IN_USE mask/shift definitions in
  dcn401_hubbub.h
- Wire up .get_mall_en = hubbub32_get_mall_en in hubbub4_01_funcs

Reviewed-by: ChiaHsuan (Tom) Chung <chiahsuan.chung@amd.com>
Signed-off-by: James Lin <PingLei.Lin@amd.com>
Signed-off-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

James Lin 2026-06-24 15:36:03 +08:00 • committed by Alex Deucher

parent fd651b9a3b

commit cee2f77c77

3 changed files with 7 additions and 3 deletions

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3

drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.c

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4

drivers/gpu/drm/amd/display/dc/hubbub/dcn401/dcn401_hubbub.h

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3

drivers/gpu/drm/amd/display/dc/resource/dcn401/dcn401_resource.h

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