Restores lost states after wakeup from sleep

Author: aluveitie

AMDRyzenCPUPowerManagement/AMDRyzenCPUPowerManagement.cpp

@@ -118,7 +118,7 @@ void AMDRyzenCPUPowerManagement::startWorkLoop() {
 
                 //Read PStateDef generated by EFI.
                 if(pmRyzen_cpu_is_master(cpu_num))
-                    provider->dumpPstate();
+                    provider->dumpPstate(nullptr);
 
 
                 if(!pmRyzen_cpu_primary_in_core(cpu_num)) return;
@@ -381,12 +381,17 @@ IOReturn AMDRyzenCPUPowerManagement::setPowerState(unsigned long powerStateOrdin
     if (0 == powerStateOrdinal) {
         // Going to sleep
         IOLog("AMDCPUSupport::setPowerState preparing for sleep\n");
-        wentToSleep = true;
+        sleepState.sleep = true;
+        sleepState.cpb = getCPBState();
+        dumpPstate(sleepState.pstate);
+        
         stopWorkLoop();
-    } else if (1 == powerStateOrdinal && wentToSleep) {
+    } else if (1 == powerStateOrdinal && sleepState.sleep) {
         // Waking up
         IOLog("AMDCPUSupport::setPowerState preparing for wakeup\n");
-        wentToSleep = false;
+        sleepState.sleep = false;
+        setCPBState(sleepState.cpb);
+        writePstate(sleepState.pstate);
         startWorkLoop();
     }
 
@@ -637,9 +642,8 @@ void AMDRyzenCPUPowerManagement::updatePackageEnergy(){
     pwrLastTSC = rdtsc64();
 }
 
-void AMDRyzenCPUPowerManagement::dumpPstate(){
+void AMDRyzenCPUPowerManagement::dumpPstate(uint64_t buf[8]){
 
-    uint8_t len = 0;
     for (uint32_t i = 0; i < kMSR_PSTATE_LEN; i++) {
         uint64_t msr_value_buf = 0;
         bool err = !read_msr(kMSR_PSTATE_0 + i, &msr_value_buf);
@@ -658,17 +662,12 @@ void AMDRyzenCPUPowerManagement::dumpPstate(){
         PStateDef_perCore[i] = msr_value_buf;
         PStateDefClock_perCore[i] = clock;
 
-        if(msr_value_buf & ((uint64_t)1 << 63)) len++;
-        //        IOLog("a: %llu", msr_value_buf);
-    }
-    
-    PStateEnabledLen = max(PStateEnabledLen, len);
+        if(buf != nullptr) buf[i] = msr_value_buf;
+    };
 }
 
 void AMDRyzenCPUPowerManagement::writePstate(const uint64_t *buf){
 
-    PStateEnabledLen = 0;
-    
     //A bit hacky but at least works for now.
     void* args[] = {this, (void*)buf};
 
@@ -691,7 +690,7 @@ void AMDRyzenCPUPowerManagement::writePstate(const uint64_t *buf){
 
 
         if(!pmRyzen_cpu_is_master(cpu_number())) return;
-        provider->dumpPstate();
+        provider->dumpPstate(nullptr);
 
     }, nullptr, args);
 

AMDRyzenCPUPowerManagement/AMDRyzenCPUPowerManagement.hpp

@@ -72,6 +72,12 @@ typedef struct tctl_offset {
     int offset;
 } TempOffset;
 
+typedef struct sleep_state {
+    bool sleep;
+    bool cpb;
+    uint64_t pstate[8];
+} SleepState;
+
 
 static IOPMPowerState powerStates[kNrOfPowerStates] = {
    {1, kIOPMPowerOff, kIOPMPowerOff, kIOPMPowerOff, 0, 0, 0, 0, 0, 0, 0, 0},
@@ -153,7 +159,7 @@ class AMDRyzenCPUPowerManagement : public IOService {
 
     void registerRequest();
 
-    void dumpPstate();
+    void dumpPstate(uint64_t buf[8]);
     void writePstate(const uint64_t *buf);
 
     bool initSuperIO(uint16_t* chipIntel);
@@ -204,7 +210,6 @@ class AMDRyzenCPUPowerManagement : public IOService {
     uint8_t PStateCur_perCore[CPUInfo::MaxCpus];
     uint8_t PStateCtl = 0;
     uint64_t PStateDef_perCore[8];
-    uint8_t PStateEnabledLen = 0;
     float PStateDefClock_perCore[8];
     bool cpbSupported;
 
@@ -250,7 +255,8 @@ class AMDRyzenCPUPowerManagement : public IOService {
 
     IOPCIDevice *fIOPCIDevice;
     bool getPCIService();
-    bool wentToSleep;
+    
+    SleepState sleepState;
 
     void startWorkLoop();
     void stopWorkLoop();