Cherry-pick cppc_cpufreq series into 24.04_linux-nvidia-adv-6.8-next #29
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added 2 commits
November 1, 2024 15:42
The CPPC performance feedback counters could be 0 or unchanged when the target cpu is in a low-power idle state, e.g. power-gated or clock-gated. When the counters are 0, cppc_cpufreq_get_rate() returns 0 KHz, which makes cpufreq_online() get a false error and fail to generate a cpufreq policy. When the counters are unchanged, the existing cppc_perf_from_fbctrs() returns a cached desired perf, but some platforms may update the real frequency back to the desired perf reg. For the above cases in cppc_cpufreq_get_rate(), get the latest desired perf from the CPPC reg to reflect the frequency because some platforms may update the actual frequency back there; if failed, use the cached desired perf. Fixes: 6a4fec4 ("cpufreq: cppc: cppc_cpufreq_get_rate() returns zero in all error cases.") Signed-off-by: Jie Zhan <[email protected]> Reviewed-by: Zeng Heng <[email protected]> Reviewed-by: Ionela Voinescu <[email protected]> Reviewed-by: Huisong Li <[email protected]> Signed-off-by: Viresh Kumar <[email protected]> (cherry picked from commit c47195631960b626058c335aec31f186fa854f97 linux-next) Signed-off-by: Jamie Nguyen <[email protected]> Tested-by: Carol Soto <[email protected]>
Since commit 6c8d750 ("cpufreq / cppc: Work around for Hisilicon CPPC cpufreq"), we introduce a workround for HiSilicon platforms that do not support performance feedback counters, whereas they can get the actual frequency from the desired perf register. Later on, FIE is disabled in that workaround as well. Now the workround can be handled by the common code. Desired perf would be read and converted to frequency if feedback counters don't change. FIE would be disabled if the CPPC regs are in PCC region. Hence, the workaround is no longer needed and can be safely removed, in an effort to consolidate the driver procedure. Signed-off-by: Jie Zhan <[email protected]> Reviewed-by: Xiongfeng Wang <[email protected]> Reviewed-by: Huisong Li <[email protected]> [ Viresh: Move fie_disabled withing CONFIG option to fix warning ] Signed-off-by: Viresh Kumar <[email protected]> (cherry picked from commit ea1829d4d413bc38774703acfc266472f7bc0bb5 linux-next) Signed-off-by: Jamie Nguyen <[email protected]> Tested-by: Carol Soto <[email protected]>
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clsotog
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Nov 1, 2024
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Successfully Passed the compilation for amd64 and arm64. |
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Applied to the branch and pushed.
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Subject: Re: [NVIDIA/NV-Kernels] Cherry-pick cppc_cpufreq series into 24.04_linux-nvidia-adv-6.8-next (PR #29)
Successfully Passed the compilation for amd64 and arm64.
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KobaKoNvidia
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Cherry-pick the following series into 24.04_linux-nvidia-adv-6.8-next: https://lore.kernel.org/linux-arm-kernel/[email protected]/