Re: [PATCH] cpufreq: intel_pstate: Fix Raptor Lake-E cpufreq limits

[Henry Tseng]

On Mon, 11 May 2026 16:53:28 -0700, Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx> wrote:
> Raptor Lake-E processors are not correctly showing cpufreq frequency
> limits.
> 
> These CPUs don't set X86_FEATURE_HYBRID_CPU and have no E-cores, but
> P-cores still use hybrid scaling factor.
> ...

Tested on Intel Core 9 273PE (Bartlett Lake P-core only):
cpuinfo_max_freq is now correctly reported as 5.5/5.7 GHz, matching
the datasheet, via the dynamic CPPC compute path.

On another Bartlett Lake P-core only SKU (Intel Core 7 253PE), the
CPPC-computed factor (80645) overshoots the datasheet Max Turbo
Frequency (5.5 GHz) by 100 MHz, matching the CPPC rounding error
described in the commit message.

I'll send a standalone patch adding Bartlett Lake to
intel_hybrid_scaling_factor[] with HYBRID_SCALING_FACTOR_ADL to
address the 253PE residual.

Tested-by: Henry Tseng <henrytseng@xxxxxxxx>

Thanks,
Henry