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| author | Danijel Slivka <[email protected]> | 2024-07-05 14:15:32 +0200 |
|---|---|---|
| committer | Alex Deucher <[email protected]> | 2024-07-10 10:12:37 -0400 |
| commit | 708f220567d4a398ee1553ee6519f7e73ae5ed6c (patch) | |
| tree | 9b15d455fc98f45b1e8c8b31392c3f29d9675508 /tools/testing/selftests/bpf/progs/test_autoload.c | |
| parent | d02ddefc7eedaa6394279bad522c70fd5d63e163 (diff) | |
drm/amd/pm: Ignore initial value in smu response register
Why:
If the reg mmMP1_SMN_C2PMSG_90 is being written to during amdgpu driver
load or driver unload, subsequent amdgpu driver load will fail at
smu_hw_init. The default of mmMP1_SMN_C2PMSG_90 register at a clean
environment is 0x1 and if value differs from expected, amdgpu driver
load will fail.
How to fix:
Ignore the initial value in smu response register before the first smu
message is sent,if smc in SMU_FW_INIT state, just proceed further to
send the message. If register holds an unexpected value after smu message
was sent set, smc_state to SMU_FW_HANG state and no further smu messages
will be sent.
v2:
Set SMU_FW_INIT state at the start of smu hw_init/resume.
Check smc_fw_state before sending smu message if in hang state skip
sending message.
Set SMU_FW_HANG only in case unexpected value is detected
Signed-off-by: Danijel Slivka <[email protected]>
Reviewed-by: Kenneth Feng <[email protected]>
Reviewed-by: Lijo Lazar <[email protected]>
Reviewed-by: Asad Kamal <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_autoload.c')
0 files changed, 0 insertions, 0 deletions