Fixes potential cause of freezes after sleep

Author: aluveitie

AMDRyzenCPUPowerManagement/AMDRyzenCPUPowerManagement.cpp

@@ -376,15 +376,15 @@ IOReturn AMDRyzenCPUPowerManagement::setPowerState(unsigned long powerStateOrdin
         IOLog("AMDCPUSupport::setPowerState preparing for sleep\n");
         sleepState.sleep = true;
         sleepState.cpb = getCPBState();
-        dumpPstate(sleepState.pstate);
+        //dumpPstate(sleepState.pstate);
 
         stopWorkLoop();
     } else if (1 == powerStateOrdinal && sleepState.sleep) {
         // Waking up
         IOLog("AMDCPUSupport::setPowerState preparing for wakeup\n");
         sleepState.sleep = false;
         setCPBState(sleepState.cpb);
-        writePstate(sleepState.pstate);
+        //writePstate(sleepState.pstate);
         startWorkLoop();
     }
 
@@ -498,18 +498,22 @@ void AMDRyzenCPUPowerManagement::calculateEffectiveFrequency(uint8_t physical){
     //read of last APERF, the effective frequency calculated in is invalid.
     //Yeah, so we will do nothing.
     if(APERF <= lastAPERF || MPERF <= lastMPERF) {
-        IOLog("AMDCPUSupport::calculateEffectiveFrequency: frequency is invalid!!!");
+        IOLog("AMDCPUSupport::calculateEffectiveFrequency: frequency is invalid for %u", physical);
+        lastAPERF_PerCore[physical] = APERF;
+        lastMPERF_PerCore[physical] = MPERF;
         return;
     }
 
     float freqP0 = PStateDefClock_perCore[0];
 
     uint64_t deltaAPERF = APERF - lastAPERF;
+    uint64_t deltaMPERF = MPERF - lastMPERF;
     deltaAPERF_PerCore[physical] = deltaAPERF;
-    deltaMPERF_PerCore[physical] = MPERF - lastMPERF;
-    float effFreq = ((float)deltaAPERF / (float)(MPERF - lastMPERF)) * freqP0;
-    
-    effFreq_perCore[physical] = effFreq;
+    deltaMPERF_PerCore[physical] = deltaMPERF;
+    if (deltaMPERF != 0) {
+        float effFreq = ((float)deltaAPERF / (float)(deltaMPERF)) * freqP0;
+        effFreq_perCore[physical] = effFreq;
+    }
 
     lastAPERF_PerCore[physical] = APERF;
     lastMPERF_PerCore[physical] = MPERF;