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| author | Mario Limonciello <mario.limonciello@amd.com> | 2026-09-21 14:02:33 -0500 |
|---|---|---|
| committer | Mario Limonciello <superm1@kernel.org> | 2026-10-01 12:56:41 -0500 |
| commit | 8de705037124dd1cd49bd8cae6536d63ec4e1807 (patch) | |
| tree | 6dc8a6e541ebe6293e712d62b3644547f6fa23b7 /tools/perf/scripts/python/task-analyzer.py | |
| parent | f6d3cbc63935fa8911da87e91ed768824d495470 (diff) | |
cpufreq: amd-pstate: Propagate cppc_set_auto_sel() errors on mode change
amd_pstate_change_mode_without_dvr_change() iterates over the online CPUs
and calls cppc_set_auto_sel() to enable or disable hardware autonomous
selection, but discards its return value and unconditionally returns 0.
If the firmware rejects the request, the failure is hidden: the cpufreq
core records the mode transition as successful while the hardware stays in
its previous autonomous-selection state. The software mode and the actual
hardware behaviour then disagree, breaking the expected frequency scaling.
Check the return value of cppc_set_auto_sel() and propagate the first
error to the caller so the sysfs write reports the failure.
Reported-by: Sashiko <sashiko-bot@kernel.org>
Closes: https://sashiko.dev/#/bug/linux-d114a94a-655b-43a6-91b1-9484889726c9
Fixes: 3ca7bc818d8c ("cpufreq: amd-pstate: Add guided mode control support via sysfs")
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20260921190235.3651688-2-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <superm1@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/task-analyzer.py')
0 files changed, 0 insertions, 0 deletions