cpufreq: CPPC: fix perf_to_khz/khz_to_perf conversion exception

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[ Upstream commit d93df29bda ]

When the nominal_freq recorded by the kernel is equal to the lowest_freq,
and the frequency adjustment operation is triggered externally, there is
a logic error in cppc_perf_to_khz()/cppc_khz_to_perf(), resulting in perf
and khz conversion errors.

Fix this by adding a branch processing logic when nominal_freq is equal
to lowest_freq.

Fixes: ec1c7ad476 ("cpufreq: CPPC: Fix performance/frequency conversion")
Signed-off-by: liwei <liwei728@huawei.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://patch.msgid.link/20241024022952.2627694-1-liwei728@huawei.com
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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liwei 2024-10-24 10:29:52 +08:00 • committed by Greg Kroah-Hartman

parent 33e89c16ce

commit 2f2684c790

1 changed files with 17 additions and 5 deletions

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drivers/acpi/cppc_acpi.c

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