DRAM MR4 tsensor reading

Source/hoc-clk/sysmodule/src/board/board_sensor.cpp

@@ -36,6 +36,7 @@
 #include "../file/config.hpp"
 #include "../hos/apm_ext.h"
 #include "../i2c/i2cDrv.h"
+#include "../soc/dram_mrr.hpp"
 #include "../tsensor/aotag.hpp"
 #include "../tsensor/bq24193.hpp"
 #include "../tsensor/soctherm.hpp"
@@ -46,6 +47,32 @@
 
 namespace board {
 
+    namespace {
+        /* Only poll every 10 ticks to avoid stalling EMC too much */
+        constexpr u32 DramMr4PollDivisor = 20; // 1 - 20 seconds depending on polling interval
+        u32 gDramMr4Tick = DramMr4PollDivisor;
+        s32 gDramMr4Millis = 30000; /* 4x refresh default */
+
+        s32 PollDramMr4TempMilli() {
+            u8 mr4 = 0;
+            if (!soc::mrr::ReadRamMr4(&mr4))
+                return 0; /* stock exosphere */
+
+            /* TODO: verify this table manually*/
+            switch (mr4 & 0x7)
+            {
+                case 0x0: return 0;      /* below operating range */
+                case 0x1: return 30000;  /* 4x refresh */
+                case 0x2: return 50000;  /* 2x refresh */
+                case 0x3: return 85000;  /* 1x refresh */
+                case 0x4: return 95000;  /* 0.5x refresh */
+                case 0x5: return 100000; /* 0.25x refresh */
+                case 0x6: return 105000; /* 0.25x refresh, de-rated */
+                default:  return 110000; /* above operating range */
+            }
+        }
+    }
+
     s32 GetTemperatureMilli(HocClkThermalSensor sensor) {
         s32 millis = 0;
         BatteryChargeInfo info;
@@ -90,9 +117,9 @@ namespace board {
             case HocClkThermalSensor_MEM: {
                 if (board::GetSocType() == HocClkSocType_Mariko && tsensor::IsInitialized() && tsensor::ReadAotag() > 0) {
                     if(board::GetConsoleType() == HocClkConsoleType_Aula) { // Aula has a misplaced thermal sensor that makes tBoard report too high
-                        millis = tsensor::ReadAotag();
+                        millis = (tsensor::ReadAotag() * 0.40f) + (gDramMr4Millis * 0.60f);
                     } else { // On other consoles it's placed correctly so avoid relying on AOTAG
-                        millis = (tsensor::ReadAotag() * 0.40f) + (tmp451TempPcb() * 0.6f); 
+                        millis = (tsensor::ReadAotag() * 0.20f) + (tmp451TempPcb() * 0.40f) + (gDramMr4Millis * 0.40f); 
                     }
                 } else {
                     millis = board::GetSocType() == HocClkSocType_Mariko ? temps.pllx : temps.mem;
@@ -111,6 +138,14 @@ namespace board {
                 millis = tsensor::ReadAotag();
                 break;
             }
+            case HocClkThermalSensor_DRAM: {
+                if (++gDramMr4Tick >= DramMr4PollDivisor) {
+                    gDramMr4Tick = 0;
+                    gDramMr4Millis = PollDramMr4TempMilli();
+                }
+                millis = gDramMr4Millis;
+                break;
+            }
             default: {
                 ASSERT_ENUM_VALID(HocClkThermalSensor, sensor);
             }