APPLIED Re: [SRU] [OEM-5.10] [PATCH 0/2] Pull in AMD Ryzen CPPC fixes

[Timo Aaltonen]

On 22.6.2021 20.16, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1928482
> 
> [Impact]
> Incorrect frequencies are calculated, so the performance can be
> affected.
> 
> [Fix]
> 
> [Test]
> Without the fix:
> $ lscpu | grep MHz
> CPU MHz:                         1391.161
> CPU max MHz:                     4806.6401
> CPU min MHz:                     1600.0000
> 
> Witht he fix:
> $ lscpu | grep MHz
> CPU MHz:                         1600.000
> CPU max MHz:                     4287.7920
> CPU min MHz:                     1600.0000
> 
> [Where problems could occur]
> This change is specific to limited AMD CPU models, unless there's a
> typo on the numbers, regression risk is rather low.
> 
> Huang Rui (1):
>    x86, sched: Fix the AMD CPPC maximum performance value on certain AMD
>      Ryzen generations
> 
> Nathan Fontenot (1):
>    x86, sched: Calculate frequency invariance for AMD systems
> 
>   arch/x86/include/asm/processor.h |  2 +
>   arch/x86/include/asm/topology.h  |  5 +++
>   arch/x86/kernel/cpu/amd.c        | 16 +++++++
>   arch/x86/kernel/smpboot.c        | 76 +++++++++++++++++++++++++++++---
>   drivers/acpi/cppc_acpi.c         |  7 +++
>   drivers/cpufreq/acpi-cpufreq.c   |  6 ++-
>   6 files changed, 106 insertions(+), 6 deletions(-)
> 


-- 
t