cpufreq/amd-pstate: Don't update CPPC request in amd_pstate_cpu_boost_update()

When boost is changed the CPPC value is changed in amd_pstate_cpu_boost_update()
but then changed again when refresh_frequency_limits() and all it's callbacks
occur.  The first is a pointless write, so instead just update the limits for
the policy and let the policy refresh anchor everything properly.

Fixes: c8c68c38b56f ("cpufreq: amd-pstate: initialize core precision boost state")
Reviewed-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Reviewed-by: Perry Yuan <perry.yuan@amd.com>
Tested-by: Dhananjay Ugwekar <dhananjay.ugwekar@amd.com>
Link: https://lore.kernel.org/r/20241012174519.897-2-mario.limonciello@amd.com
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>

diff --git a/drivers/cpufreq/amd-pstate.c b/drivers/cpufreq/amd-pstate.c
index dfa9a146769b87aa4762289d36d56b612f2c21d3..13dec8b1e7a8070bafabf07b2d78062b8872def6 100644 (file)
--- a/drivers/cpufreq/amd-pstate.c
+++ b/drivers/cpufreq/amd-pstate.c
@@ -665,34 +665,12 @@ static void amd_pstate_adjust_perf(unsigned int cpu,
 static int amd_pstate_cpu_boost_update(struct cpufreq_policy *policy, bool on)
 {
        struct amd_cpudata *cpudata = policy->driver_data;
-       struct cppc_perf_ctrls perf_ctrls;
-       u32 highest_perf, nominal_perf, nominal_freq, max_freq;
+       u32 nominal_freq, max_freq;
        int ret = 0;
 
-       highest_perf = READ_ONCE(cpudata->highest_perf);
-       nominal_perf = READ_ONCE(cpudata->nominal_perf);
        nominal_freq = READ_ONCE(cpudata->nominal_freq);
        max_freq = READ_ONCE(cpudata->max_freq);
 
-       if (boot_cpu_has(X86_FEATURE_CPPC)) {
-               u64 value = READ_ONCE(cpudata->cppc_req_cached);
-
-               value &= ~GENMASK_ULL(7, 0);
-               value |= on ? highest_perf : nominal_perf;
-               WRITE_ONCE(cpudata->cppc_req_cached, value);
-
-               wrmsrl_on_cpu(cpudata->cpu, MSR_AMD_CPPC_REQ, value);
-       } else {
-               perf_ctrls.max_perf = on ? highest_perf : nominal_perf;
-               ret = cppc_set_perf(cpudata->cpu, &perf_ctrls);
-               if (ret) {
-                       cpufreq_cpu_release(policy);
-                       pr_debug("Failed to set max perf on CPU:%d. ret:%d\n",
-                               cpudata->cpu, ret);
-                       return ret;
-               }
-       }
-
        if (on)
                policy->cpuinfo.max_freq = max_freq;
        else if (policy->cpuinfo.max_freq > nominal_freq * 1000)