[PATCH 6.18.y 2/2] cpufreq: intel_pstate: Use correct scaling factor on Raptor Lake-E

[Sasha Levin <sashal@kernel.org>]

From: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>

[ Upstream commit 0e7c710478b3089cdfe8669347f77b163e836c4f ]

Raptor Lake-E has the same processor ID as Raptor Lake-S, so there is
an entry in intel_hybrid_scaling_factor[] for it.  It does not contain
E-cores though and hybrid_get_cpu_type() returns 0 for its P-cores, so
they get the default "core" scaling factor.  However, the original
Raptor Lake scaling factor for P-cores still needs to be used for
mapping the HWP performance levels of the P-cores in Raptor Lake-E to
frequency, as though they were part of a real hybrid system.

To address this, update hwp_get_cpu_scaling() to return
hybrid_scaling_factor, which is the P-core scaling factor
retrieved from intel_hybrid_scaling_factor[], for all CPUs
that are not enumerated as E-cores.

Fixes: 9b18d536b124 ("cpufreq: intel_pstate: Use CPPC to get scaling factors")
Link: https://lore.kernel.org/all/20260511235328.2018458-1-srinivas.pandruvada@linux.intel.com/
Reported-by: Henry Tseng <henrytseng@qnap.com>
Closes: https://lore.kernel.org/linux-pm/20260508063032.3248602-1-henrytseng@qnap.com/
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: All applicable <stable@vger.kernel.org>
Link: https://patch.msgid.link/4523296.ejJDZkT8p0@rafael.j.wysocki
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/cpufreq/intel_pstate.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 6e1a793408dee..7fb6412b5f193 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -2308,7 +2308,7 @@ static int hwp_get_cpu_scaling(int cpu)
 		 * Return the hybrid scaling factor for P-cores and use the
 		 * default core scaling for E-cores.
 		 */
-		if (hybrid_get_cpu_type(cpu) == INTEL_CPU_TYPE_CORE)
+		if (hybrid_get_cpu_type(cpu) != INTEL_CPU_TYPE_ATOM)
 			return hybrid_scaling_factor;
 
 		return core_get_scaling();
-- 
2.53.0