* [PATCH] cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake
@ 2026-05-13 10:28 Henry Tseng
2026-05-13 10:40 ` Rafael J. Wysocki
2026-05-13 19:47 ` Rafael J. Wysocki
0 siblings, 2 replies; 4+ messages in thread
From: Henry Tseng @ 2026-05-13 10:28 UTC (permalink / raw)
To: Rafael J. Wysocki, Srinivas Pandruvada, Len Brown, Viresh Kumar
Cc: linux-pm, Henry Tseng
Bartlett Lake P-core only SKUs (e.g. Intel Core 9 273PE)
do not report X86_FEATURE_HYBRID_CPU and are not in
intel_hybrid_scaling_factor[]. In hwp_get_cpu_scaling(), the
non-hybrid fallback then applies core_get_scaling() (100000),
producing cpuinfo_max_freq values that exceed the documented Max
Turbo Frequency:
intel_pstate: CPU0: PERF_CTL turbo = 57
intel_pstate: CPU0: HWP_CAP guaranteed = 30
intel_pstate: CPU0: HWP_CAP highest = 70
intel_pstate: CPU0: HWP-to-frequency scaling factor: 100000
intel_pstate: set_policy cpuinfo.max 7000000 policy->max 7000000
...
intel_pstate: CPU12: PERF_CTL turbo = 57
intel_pstate: CPU12: HWP_CAP guaranteed = 30
intel_pstate: CPU12: HWP_CAP highest = 73
intel_pstate: CPU12: HWP-to-frequency scaling factor: 100000
intel_pstate: set_policy cpuinfo.max 7300000 policy->max 7300000
...
Per the Intel datasheet [1], the Intel Core 9 273PE specifies:
Performance-cores: 12
Efficient-cores: 0
Max Turbo Frequency: 5.7 GHz
Intel Thermal Velocity Boost Frequency: 5.7 GHz
Intel Turbo Boost Max Technology 3.0 Frequency: 5.6 GHz
Performance-core Max Turbo Frequency: 5.4 GHz
Performance-core Base Frequency: 2.3 GHz
Bartlett Lake P-cores are Raptor Cove cores, per
commit d466304c4322 ("x86/cpu: Add CPU model number for Bartlett
Lake CPUs with Raptor Cove cores"). The Alder Lake and Raptor Lake
P-core entries in intel_hybrid_scaling_factor[] use
HYBRID_SCALING_FACTOR_ADL (78741). The same factor applies to
Bartlett Lake.
Add Bartlett Lake to intel_hybrid_scaling_factor[] with
HYBRID_SCALING_FACTOR_ADL so HWP performance levels map to the
correct CPU frequencies matching the datasheet's Max Turbo Frequency.
[1] https://www.intel.com/content/www/us/en/products/sku/245717/intel-core-9-processor-273pe-36m-cache-up-to-5-70-ghz/specifications.html
Signed-off-by: Henry Tseng <henrytseng@qnap.com>
---
drivers/cpufreq/intel_pstate.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 1292da53e5fc..2737e51cff34 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -3734,6 +3734,7 @@ static const struct x86_cpu_id intel_hybrid_scaling_factor[] = {
X86_MATCH_VFM(INTEL_RAPTORLAKE, HYBRID_SCALING_FACTOR_ADL),
X86_MATCH_VFM(INTEL_RAPTORLAKE_P, HYBRID_SCALING_FACTOR_ADL),
X86_MATCH_VFM(INTEL_RAPTORLAKE_S, HYBRID_SCALING_FACTOR_ADL),
+ X86_MATCH_VFM(INTEL_BARTLETTLAKE, HYBRID_SCALING_FACTOR_ADL),
X86_MATCH_VFM(INTEL_METEORLAKE_L, HYBRID_SCALING_FACTOR_MTL),
X86_MATCH_VFM(INTEL_LUNARLAKE_M, HYBRID_SCALING_FACTOR_LNL),
{}
--
2.43.0
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH] cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake
2026-05-13 10:28 [PATCH] cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake Henry Tseng
@ 2026-05-13 10:40 ` Rafael J. Wysocki
2026-05-14 10:17 ` Henry Tseng
2026-05-13 19:47 ` Rafael J. Wysocki
1 sibling, 1 reply; 4+ messages in thread
From: Rafael J. Wysocki @ 2026-05-13 10:40 UTC (permalink / raw)
To: Henry Tseng
Cc: Rafael J. Wysocki, Srinivas Pandruvada, Len Brown, Viresh Kumar,
linux-pm
On Wed, May 13, 2026 at 12:29 PM Henry Tseng <henrytseng@qnap.com> wrote:
>
> Bartlett Lake P-core only SKUs (e.g. Intel Core 9 273PE)
> do not report X86_FEATURE_HYBRID_CPU and are not in
> intel_hybrid_scaling_factor[]. In hwp_get_cpu_scaling(), the
> non-hybrid fallback then applies core_get_scaling() (100000),
> producing cpuinfo_max_freq values that exceed the documented Max
> Turbo Frequency:
>
> intel_pstate: CPU0: PERF_CTL turbo = 57
> intel_pstate: CPU0: HWP_CAP guaranteed = 30
> intel_pstate: CPU0: HWP_CAP highest = 70
> intel_pstate: CPU0: HWP-to-frequency scaling factor: 100000
> intel_pstate: set_policy cpuinfo.max 7000000 policy->max 7000000
> ...
> intel_pstate: CPU12: PERF_CTL turbo = 57
> intel_pstate: CPU12: HWP_CAP guaranteed = 30
> intel_pstate: CPU12: HWP_CAP highest = 73
> intel_pstate: CPU12: HWP-to-frequency scaling factor: 100000
> intel_pstate: set_policy cpuinfo.max 7300000 policy->max 7300000
> ...
>
> Per the Intel datasheet [1], the Intel Core 9 273PE specifies:
>
> Performance-cores: 12
> Efficient-cores: 0
> Max Turbo Frequency: 5.7 GHz
> Intel Thermal Velocity Boost Frequency: 5.7 GHz
> Intel Turbo Boost Max Technology 3.0 Frequency: 5.6 GHz
> Performance-core Max Turbo Frequency: 5.4 GHz
> Performance-core Base Frequency: 2.3 GHz
>
> Bartlett Lake P-cores are Raptor Cove cores, per
> commit d466304c4322 ("x86/cpu: Add CPU model number for Bartlett
> Lake CPUs with Raptor Cove cores"). The Alder Lake and Raptor Lake
> P-core entries in intel_hybrid_scaling_factor[] use
> HYBRID_SCALING_FACTOR_ADL (78741). The same factor applies to
> Bartlett Lake.
>
> Add Bartlett Lake to intel_hybrid_scaling_factor[] with
> HYBRID_SCALING_FACTOR_ADL so HWP performance levels map to the
> correct CPU frequencies matching the datasheet's Max Turbo Frequency.
>
> [1] https://www.intel.com/content/www/us/en/products/sku/245717/intel-core-9-processor-273pe-36m-cache-up-to-5-70-ghz/specifications.html
>
> Signed-off-by: Henry Tseng <henrytseng@qnap.com>
> ---
> drivers/cpufreq/intel_pstate.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 1292da53e5fc..2737e51cff34 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -3734,6 +3734,7 @@ static const struct x86_cpu_id intel_hybrid_scaling_factor[] = {
> X86_MATCH_VFM(INTEL_RAPTORLAKE, HYBRID_SCALING_FACTOR_ADL),
> X86_MATCH_VFM(INTEL_RAPTORLAKE_P, HYBRID_SCALING_FACTOR_ADL),
> X86_MATCH_VFM(INTEL_RAPTORLAKE_S, HYBRID_SCALING_FACTOR_ADL),
> + X86_MATCH_VFM(INTEL_BARTLETTLAKE, HYBRID_SCALING_FACTOR_ADL),
> X86_MATCH_VFM(INTEL_METEORLAKE_L, HYBRID_SCALING_FACTOR_MTL),
> X86_MATCH_VFM(INTEL_LUNARLAKE_M, HYBRID_SCALING_FACTOR_LNL),
> {}
> --
Do I understand correctly that
https://lore.kernel.org/linux-pm/4523296.ejJDZkT8p0@rafael.j.wysocki/
works for you?
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH] cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake
2026-05-13 10:40 ` Rafael J. Wysocki
@ 2026-05-14 10:17 ` Henry Tseng
0 siblings, 0 replies; 4+ messages in thread
From: Henry Tseng @ 2026-05-14 10:17 UTC (permalink / raw)
To: Rafael J. Wysocki
Cc: Henry Tseng, Srinivas Pandruvada, Len Brown, Viresh Kumar,
linux-pm
On Wed, 13 May 2026 12:40:36 +0200, "Rafael J. Wysocki" <rafael@kernel.org> wrote:
> On Wed, May 13, 2026 at 12:29 PM Henry Tseng <henrytseng@qnap.com> wrote:
> >
> > Bartlett Lake P-core only SKUs (e.g. Intel Core 9 273PE)
> > do not report X86_FEATURE_HYBRID_CPU and are not in
> > intel_hybrid_scaling_factor[]. In hwp_get_cpu_scaling(), the
> > non-hybrid fallback then applies core_get_scaling() (100000),
> > producing cpuinfo_max_freq values that exceed the documented Max
> > Turbo Frequency:
> >
> > intel_pstate: CPU0: PERF_CTL turbo = 57
> > intel_pstate: CPU0: HWP_CAP guaranteed = 30
> > intel_pstate: CPU0: HWP_CAP highest = 70
> > intel_pstate: CPU0: HWP-to-frequency scaling factor: 100000
> > intel_pstate: set_policy cpuinfo.max 7000000 policy->max 7000000
> > ...
> > intel_pstate: CPU12: PERF_CTL turbo = 57
> > intel_pstate: CPU12: HWP_CAP guaranteed = 30
> > intel_pstate: CPU12: HWP_CAP highest = 73
> > intel_pstate: CPU12: HWP-to-frequency scaling factor: 100000
> > intel_pstate: set_policy cpuinfo.max 7300000 policy->max 7300000
> > ...
> >
> > Per the Intel datasheet [1], the Intel Core 9 273PE specifies:
> >
> > Performance-cores: 12
> > Efficient-cores: 0
> > Max Turbo Frequency: 5.7 GHz
> > Intel Thermal Velocity Boost Frequency: 5.7 GHz
> > Intel Turbo Boost Max Technology 3.0 Frequency: 5.6 GHz
> > Performance-core Max Turbo Frequency: 5.4 GHz
> > Performance-core Base Frequency: 2.3 GHz
> >
> > Bartlett Lake P-cores are Raptor Cove cores, per
> > commit d466304c4322 ("x86/cpu: Add CPU model number for Bartlett
> > Lake CPUs with Raptor Cove cores"). The Alder Lake and Raptor Lake
> > P-core entries in intel_hybrid_scaling_factor[] use
> > HYBRID_SCALING_FACTOR_ADL (78741). The same factor applies to
> > Bartlett Lake.
> >
> > Add Bartlett Lake to intel_hybrid_scaling_factor[] with
> > HYBRID_SCALING_FACTOR_ADL so HWP performance levels map to the
> > correct CPU frequencies matching the datasheet's Max Turbo Frequency.
> >
> > [1] https://www.intel.com/content/www/us/en/products/sku/245717/intel-core-9-processor-273pe-36m-cache-up-to-5-70-ghz/specifications.html
> >
> > Signed-off-by: Henry Tseng <henrytseng@qnap.com>
> > ---
> > drivers/cpufreq/intel_pstate.c | 1 +
> > 1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> > index 1292da53e5fc..2737e51cff34 100644
> > --- a/drivers/cpufreq/intel_pstate.c
> > +++ b/drivers/cpufreq/intel_pstate.c
> > @@ -3734,6 +3734,7 @@ static const struct x86_cpu_id intel_hybrid_scaling_factor[] = {
> > X86_MATCH_VFM(INTEL_RAPTORLAKE, HYBRID_SCALING_FACTOR_ADL),
> > X86_MATCH_VFM(INTEL_RAPTORLAKE_P, HYBRID_SCALING_FACTOR_ADL),
> > X86_MATCH_VFM(INTEL_RAPTORLAKE_S, HYBRID_SCALING_FACTOR_ADL),
> > + X86_MATCH_VFM(INTEL_BARTLETTLAKE, HYBRID_SCALING_FACTOR_ADL),
> > X86_MATCH_VFM(INTEL_METEORLAKE_L, HYBRID_SCALING_FACTOR_MTL),
> > X86_MATCH_VFM(INTEL_LUNARLAKE_M, HYBRID_SCALING_FACTOR_LNL),
> > {}
> > --
>
> Do I understand correctly that
>
> https://lore.kernel.org/linux-pm/4523296.ejJDZkT8p0@rafael.j.wysocki/
>
> works for you?
>
With these patches applied, it works on Intel Core 9 273PE (Bartlett
Lake). hybrid_get_cpu_type() returns 0 and cpuinfo_max_freq matches
the datasheet.
Thanks,
Henry
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake
2026-05-13 10:28 [PATCH] cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake Henry Tseng
2026-05-13 10:40 ` Rafael J. Wysocki
@ 2026-05-13 19:47 ` Rafael J. Wysocki
1 sibling, 0 replies; 4+ messages in thread
From: Rafael J. Wysocki @ 2026-05-13 19:47 UTC (permalink / raw)
To: Henry Tseng
Cc: Rafael J. Wysocki, Srinivas Pandruvada, Len Brown, Viresh Kumar,
linux-pm
On Wed, May 13, 2026 at 12:29 PM Henry Tseng <henrytseng@qnap.com> wrote:
>
> Bartlett Lake P-core only SKUs (e.g. Intel Core 9 273PE)
> do not report X86_FEATURE_HYBRID_CPU and are not in
> intel_hybrid_scaling_factor[]. In hwp_get_cpu_scaling(), the
> non-hybrid fallback then applies core_get_scaling() (100000),
> producing cpuinfo_max_freq values that exceed the documented Max
> Turbo Frequency:
>
> intel_pstate: CPU0: PERF_CTL turbo = 57
> intel_pstate: CPU0: HWP_CAP guaranteed = 30
> intel_pstate: CPU0: HWP_CAP highest = 70
> intel_pstate: CPU0: HWP-to-frequency scaling factor: 100000
> intel_pstate: set_policy cpuinfo.max 7000000 policy->max 7000000
> ...
> intel_pstate: CPU12: PERF_CTL turbo = 57
> intel_pstate: CPU12: HWP_CAP guaranteed = 30
> intel_pstate: CPU12: HWP_CAP highest = 73
> intel_pstate: CPU12: HWP-to-frequency scaling factor: 100000
> intel_pstate: set_policy cpuinfo.max 7300000 policy->max 7300000
> ...
>
> Per the Intel datasheet [1], the Intel Core 9 273PE specifies:
>
> Performance-cores: 12
> Efficient-cores: 0
> Max Turbo Frequency: 5.7 GHz
> Intel Thermal Velocity Boost Frequency: 5.7 GHz
> Intel Turbo Boost Max Technology 3.0 Frequency: 5.6 GHz
> Performance-core Max Turbo Frequency: 5.4 GHz
> Performance-core Base Frequency: 2.3 GHz
>
> Bartlett Lake P-cores are Raptor Cove cores, per
> commit d466304c4322 ("x86/cpu: Add CPU model number for Bartlett
> Lake CPUs with Raptor Cove cores"). The Alder Lake and Raptor Lake
> P-core entries in intel_hybrid_scaling_factor[] use
> HYBRID_SCALING_FACTOR_ADL (78741). The same factor applies to
> Bartlett Lake.
>
> Add Bartlett Lake to intel_hybrid_scaling_factor[] with
> HYBRID_SCALING_FACTOR_ADL so HWP performance levels map to the
> correct CPU frequencies matching the datasheet's Max Turbo Frequency.
>
> [1] https://www.intel.com/content/www/us/en/products/sku/245717/intel-core-9-processor-273pe-36m-cache-up-to-5-70-ghz/specifications.html
>
> Signed-off-by: Henry Tseng <henrytseng@qnap.com>
> ---
> drivers/cpufreq/intel_pstate.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
> index 1292da53e5fc..2737e51cff34 100644
> --- a/drivers/cpufreq/intel_pstate.c
> +++ b/drivers/cpufreq/intel_pstate.c
> @@ -3734,6 +3734,7 @@ static const struct x86_cpu_id intel_hybrid_scaling_factor[] = {
> X86_MATCH_VFM(INTEL_RAPTORLAKE, HYBRID_SCALING_FACTOR_ADL),
> X86_MATCH_VFM(INTEL_RAPTORLAKE_P, HYBRID_SCALING_FACTOR_ADL),
> X86_MATCH_VFM(INTEL_RAPTORLAKE_S, HYBRID_SCALING_FACTOR_ADL),
> + X86_MATCH_VFM(INTEL_BARTLETTLAKE, HYBRID_SCALING_FACTOR_ADL),
> X86_MATCH_VFM(INTEL_METEORLAKE_L, HYBRID_SCALING_FACTOR_MTL),
> X86_MATCH_VFM(INTEL_LUNARLAKE_M, HYBRID_SCALING_FACTOR_LNL),
> {}
> --
Tentatively applied as 7.1-rc material, thanks!
^ permalink raw reply [flat|nested] 4+ messages in thread
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2026-05-13 10:28 [PATCH] cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake Henry Tseng
2026-05-13 10:40 ` Rafael J. Wysocki
2026-05-14 10:17 ` Henry Tseng
2026-05-13 19:47 ` Rafael J. Wysocki
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