[SRU][N][PATCH v3 6/6] cpufreq: intel_pstate: Update Balance performance EPP for Emerald Rapids

[Pedro Henrique Kopper]

BugLink: https://bugs.launchpad.net/bugs/2077470

On Intel Emerald Rapids machines, we ship the Energy Performance Preference
(EPP) default for balance_performance as 128. However, during an internal
investigation together with Intel, we have determined that 32 is a more
suitable value. This leads to significant improvements in both performance
and energy:

POV-Ray: 32% faster | 12% less energy
OpenSSL: 12% faster | energy within 1%
Build Linux Kernel: 29% faster | 18% less energy

Therefore, we should move the default EPP for balance_performance to 32.
This is in line with what has already been done for Sapphire Rapids.

Signed-off-by: Pedro Henrique Kopper <pedro.kopper at canonical.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada at linux.intel.com>
Link: https://patch.msgid.link/Zqu6zjVMoiXwROBI@capivara
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
(cherry picked from commit 64a66f4a3c89b4602ee1e6cd23b28729fc4562b3)
Signed-off-by: Pedro Henrique Kopper <pedro.kopper at canonical.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 6c01bae2d3ae..5dde71808981 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -3429,6 +3429,7 @@ static const struct x86_cpu_id intel_epp_default[] = {
 	 */
 	X86_MATCH_VFM(INTEL_ALDERLAKE_L, HWP_SET_DEF_BALANCE_PERF_EPP(102)),
 	X86_MATCH_VFM(INTEL_SAPPHIRERAPIDS_X, HWP_SET_DEF_BALANCE_PERF_EPP(32)),
+	X86_MATCH_VFM(INTEL_EMERALDRAPIDS_X, HWP_SET_DEF_BALANCE_PERF_EPP(32)),
 	X86_MATCH_VFM(INTEL_METEORLAKE_L, HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,
 		      179, 64, 16)),
 	X86_MATCH_VFM(INTEL_ARROWLAKE, HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,
-- 
2.43.0