drm/amd/display: Add KUnit tests for srm_data_write and srm_data_read

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Expose srm_data_write() and srm_data_read() for KUnit and add tests
covering the sysfs SRM write/read paths:

- write stages the buffer into srm_temp and returns count; with the TA
  uninitialized psp_set_srm() fails so the committed SRM is unchanged
- read returns -EINVAL when psp_get_srm() returns NULL (TA uninitialized)
- read returns 0 for an empty SRM using the SR-IOV VF bypass so
  psp_hdcp_invoke() is a no-op and psp_get_srm() returns a non-NULL buffer

Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Signed-off-by: Fangzhi Zuo <jerry.zuo@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Bhawanpreet Lakha 2026-07-14 11:50:12 -04:00 • committed by Alex Deucher

parent 13cd064e68

commit eb5e911dff

3 changed files with 130 additions and 2 deletions

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6

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

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9

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

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117

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

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