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 <[email protected]>
spandruvada · Jul 7, 2024 · fd77d7f · fd77d7f
1 parent cf25477
commit fd77d7f
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/tools/power/x86/intel-speed-select/isst-core.c b/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));
 		}
 	}