cpufreq: intel_pstate: Update Balance performance EPP for Emerald Rapids

commit 64a66f4a3c89b4602ee1e6cd23b28729fc4562b3 upstream.

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.

Intel-SIG: commit 64a66f4a3c89 cpufreq: intel_pstate: Update Balance performance EPP for Emerald Rapids.
Backport intel_pstate driver update for 6.6 from 6.11

Signed-off-by: Pedro Henrique Kopper <[email protected]>
Acked-by: Srinivas Pandruvada <[email protected]>
Link: https://patch.msgid.link/Zqu6zjVMoiXwROBI@capivara
Signed-off-by: Rafael J. Wysocki <[email protected]>
[ Yingbao Jia: amend commit log ]
Signed-off-by: Yingbao Jia <[email protected]>

drivers/cpufreq/intel_pstate.c

@@ -3409,6 +3409,7 @@ static const struct x86_cpu_id intel_epp_default[] = {
 	 */
 	X86_MATCH_INTEL_FAM6_MODEL(ALDERLAKE_L, HWP_SET_DEF_BALANCE_PERF_EPP(102)),
 	X86_MATCH_INTEL_FAM6_MODEL(SAPPHIRERAPIDS_X, HWP_SET_DEF_BALANCE_PERF_EPP(32)),
+	X86_MATCH_INTEL_FAM6_MODEL(EMERALDRAPIDS_X, HWP_SET_DEF_BALANCE_PERF_EPP(32)),
 	X86_MATCH_INTEL_FAM6_MODEL(METEORLAKE_L, HWP_SET_EPP_VALUES(HWP_EPP_POWERSAVE,
 							HWP_EPP_BALANCE_POWERSAVE, 115, 16)),
 	{}