The pp_od_clk_voltage interface exposes a staged OverDrive workflow:
users edit clock, voltage, and power settings, then write "c" to
commit them to the SMU.
However, PP_OD_RESTORE_DEFAULT_TABLE does not follow this workflow on
every SMU version. Some backends restore their cached settings and wait
for "c", while others upload the reset table or send frequency-limit
commands directly from "r". As a result, the same userspace sequence
has different hardware effects across ASICs.
For example:
- SMU 14.0.0 and SMU 13.0.5 stage reset limits until "c".
- SMU 14.0.2 and SMU 13.0.6 apply reset values immediately.
- Navi10 stages the boot OD table, while Vega20 reads the current SMU
table instead of restoring the saved defaults.
This series makes "r" restore default values only in driver-side
staging state. "c" remains the sole operation that uploads an OD table
or sends frequency-limit commands to PMFW.
This gives pp_od_clk_voltage one consistent transaction model:
edit/reset -> staged driver state -> commit
It also permits userspace to reset a staged configuration, adjust one
or more settings, and submit the final configuration with one commit,
without temporarily applying an intermediate default configuration.
Link: https://gitlab.freedesktop.org/drm/amd/-/work_items/5690
Kevin Wang (7):
drm/amd/pm: stage od reset for smu 11.0.7
drm/amd/pm: stage od reset for smu 13.0.2
drm/amd/pm: stage od reset for smu 13.0.0/13.0.7
drm/amd/pm: stage od reset for smu 13.0.6
drm/amd/pm: stage od reset for smu 14.0.2
drm/amd/pm: stage od reset for smu 15.0.8
drm/amd/pm: stage od reset for smu vega20
.../drm/amd/pm/powerplay/hwmgr/vega20_hwmgr.c | 75 ++++++++++++++--
.../amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 2 +-
.../drm/amd/pm/swsmu/smu13/aldebaran_ppt.c | 15 +---
.../drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c | 2 +-
.../drm/amd/pm/swsmu/smu13/smu_v13_0_6_ppt.c | 85 ++++++++++---------
.../drm/amd/pm/swsmu/smu13/smu_v13_0_7_ppt.c | 2 +-
.../drm/amd/pm/swsmu/smu14/smu_v14_0_2_ppt.c | 2 +-
.../drm/amd/pm/swsmu/smu15/smu_v15_0_8_ppt.c | 50 ++++++-----
8 files changed, 145 insertions(+), 88 deletions(-)
--
2.55.0
