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[v11,7/9] cpufreq: amd-pstate: fix the MSR highest perf will be reset issue while cpb boost off

Message ID 6adc6408cafd36af9cd9eca063a3a061fde48fa8.1718262992.git.perry.yuan@amd.com
State Superseded
Headers show
Series AMD Pstate Driver Core Performance Boost | expand

Commit Message

Yuan, Perry June 13, 2024, 7:25 a.m. UTC
From: Perry Yuan <Perry.Yuan@amd.com>

Select the min perf to fix the highest perf value while update pstate
CPPC request MSR register, here it needs to limit the max perf value when
CPU boost is disabled in case of that highest perf value in the MSR will be
reset to original highest perf value which cause the BOOST control

Signed-off-by: Perry Yuan <Perry.Yuan@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
 drivers/cpufreq/amd-pstate.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series


diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index d07f09dd7eab..03e4cf177a5b 100644
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -526,6 +526,7 @@  static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
 			      u32 des_perf, u32 max_perf, bool fast_switch, int gov_flags)
 	u64 prev = READ_ONCE(cpudata->cppc_req_cached);
+	u32 nominal_perf = READ_ONCE(cpudata->nominal_perf);
 	u64 value = prev;
 	min_perf = clamp_t(unsigned long, min_perf, cpudata->min_limit_perf,
@@ -545,6 +546,10 @@  static void amd_pstate_update(struct amd_cpudata *cpudata, u32 min_perf,
 	value &= ~AMD_CPPC_DES_PERF(~0L);
 	value |= AMD_CPPC_DES_PERF(des_perf);
+	/* limit the max perf when core performance boost feature is disabled */
+	if (!amd_pstate_global_params.cpb_boost)
+		max_perf = min_t(unsigned long, nominal_perf, max_perf);
 	value &= ~AMD_CPPC_MAX_PERF(~0L);
 	value |= AMD_CPPC_MAX_PERF(max_perf);