On a Ryzen 7840HS the highest_perf value is 196, not 166 as AMD assumed. This leads to the advertised max clock speed to only be 4.35ghz instead of 5.14ghz leading to a large degradation in performance.
Fix the broken assumption and revert back to the old logic for getting highest_perf. TEST: Geekbench 6 Before Patch: Single Core: 2325 (-22%)! Multi Core: 11335 (-10%) Geekbench 6 AFTER Patch: Single Core: 2635 Multi Core: 12487 Signed-off-by: Lucas Lee Jing Yi <[email protected]> --- drivers/cpufreq/amd-pstate.c | 22 ++++++++++------------ 1 file changed, 10 insertions(+), 12 deletions(-) diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c index 08e112444c27..54df68773620 100644 --- a/drivers/cpufreq/amd-pstate.c +++ b/drivers/cpufreq/amd-pstate.c @@ -50,7 +50,6 @@ #define AMD_PSTATE_TRANSITION_LATENCY 20000 #define AMD_PSTATE_TRANSITION_DELAY 1000 -#define AMD_PSTATE_PREFCORE_THRESHOLD 166 /* * TODO: We need more time to fine tune processors with shared memory solution @@ -299,15 +298,12 @@ static int pstate_init_perf(struct amd_cpudata *cpudata) &cap1); if (ret) return ret; - - /* For platforms that do not support the preferred core feature, the - * highest_pef may be configured with 166 or 255, to avoid max frequency - * calculated wrongly. we take the AMD_CPPC_HIGHEST_PERF(cap1) value as - * the default max perf. + + /* Some CPUs have different highest_perf from others, it is safer + * to read it than to assume some erroneous value, leading to performance issues. */ - if (cpudata->hw_prefcore) - highest_perf = AMD_PSTATE_PREFCORE_THRESHOLD; - else + highest_perf = amd_get_highest_perf(); + if (highest_perf > AMD_CPPC_HIGHEST_PERF(cap1)) highest_perf = AMD_CPPC_HIGHEST_PERF(cap1); WRITE_ONCE(cpudata->highest_perf, highest_perf); @@ -329,9 +325,11 @@ static int cppc_init_perf(struct amd_cpudata *cpudata) if (ret) return ret; - if (cpudata->hw_prefcore) - highest_perf = AMD_PSTATE_PREFCORE_THRESHOLD; - else + /* Some CPUs have different highest_perf from others, it is safer + * to read it than to assume some erroneous value, leading to performance issues. + */ + highest_perf = amd_get_highest_perf(); + if (highest_perf > cppc_perf.highest_perf) highest_perf = cppc_perf.highest_perf; WRITE_ONCE(cpudata->highest_perf, highest_perf); -- 2.43.2
