tools/power/x86/intel-speed-select: Set TRL MSR in 100 MHz units

JIRA: https://issues.redhat.com/browse/RHEL-65196

commit fd77d7f
Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date:   Sat Jul 6 01:17:55 2024 -0400

    tools/power/x86/intel-speed-select: Set TRL MSR in 100 MHz units

    When SST-TF is disabled in auto mode, the performance is getting
    limited.

    This is caused by wrong programming of Turbo Ratio Limit (TRL) MSR.

    This MSR always accepts the frequency ratio in 100 MHz unit. When the
    TPMI is sending TRL in 1 MHz unit, change to 100 MHz, before updating
    TRL MSR.

    Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

Signed-off-by: Steve Best <sbest@redhat.com>

Author: sfbest

tools/power/x86/intel-speed-select/isst-core.c

@@ -283,6 +283,8 @@ int isst_set_trl(struct isst_id *id, unsigned long long trl)
 	return 0;
 }
 
+#define MSR_TRL_FREQ_MULTIPLIER		100
+
 int isst_set_trl_from_current_tdp(struct isst_id *id, unsigned long long trl)
 {
 	unsigned long long msr_trl;
@@ -310,6 +312,10 @@ int isst_set_trl_from_current_tdp(struct isst_id *id, unsigned long long trl)
 		for (i = 0; i < 8; ++i) {
 			unsigned long long _trl = trl[i];
 
+			/* MSR is always in 100 MHz unit */
+			if (isst_get_disp_freq_multiplier() == 1)
+				_trl /= MSR_TRL_FREQ_MULTIPLIER;
+
 			msr_trl |= (_trl << (i * 8));
 		}
 	}