When the SIM_READY set current preferred network type.

This looks to fix a problem where the nv_data.bin file
file gets corrupted. When greping a radio log for "md5" if something
like following is seen:

  RIL(s)  : load_md5_state: MD5 state 1
  RIL(s)  : check_md5:
  RIL(s)  : compute_md5: path /efs/nv_data.bin
  RIL(s)  : check_md5: MD5 fail. orignal md5 '628647a8e5c6cac2d586199417c0103c' computed md5 '58a635cbaf5fe4ffb2797aeaa2b32709' (rild)
  RIL(s)  : check_md5:
  RIL(s)  : compute_md5: path /efs/.nv_data.bak

It means that corruption was detected and a back version was used
which is ok. Apparently that backup version can have the default
network type revert to 2G only thus causing the symptoms reported
in b/5695729 where after taking an OTA 2G becomes the default.

By calling setCurrentPreferredNetworkType when the sim is ready we
can reset the the network type to 3G.

Note: I also tried calling setCurrentPreferredNetworkType in
EVENT_RADIO_AVAILABLE but that didn't work and we would see
the response to setPreferredNetworkType failing as the ril wasn't ready.

  RILJ    : setCurrentPreferredNetworkType: 0
  RILJ    : [0004]> REQUEST_SET_PREFERRED_NETWORK_TYPE : 0
  RILJ    : [0004]< REQUEST_SET_PREFERRED_NETWORK_TYPE error: com.android.internal.telephony.CommandException: RADIO_NOT_AVAILABLE


Bug: 5695729
Change-Id: Ibbd29cda0b201a8c08f4dcfa5cec211611e1d599

telephony/java/com/android/internal/telephony/BaseCommands.java

@@ -683,6 +683,13 @@ public abstract class BaseCommands implements CommandsInterface {
         mRilConnectedRegistrants.remove(h);
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void setCurrentPreferredNetworkType() {
+    }
+
     //***** Protected Methods
     /**
      * Store new RadioState and send notification based on the changes

telephony/java/com/android/internal/telephony/CommandsInterface.java

@@ -1310,6 +1310,12 @@ public interface CommandsInterface {
      */
     void queryAvailableBandMode (Message response);
 
+    /**
+     * Set the current preferred network type. This will be the last
+     * networkType that was passed to setPreferredNetworkType.
+     */
+    void setCurrentPreferredNetworkType();
+
     /**
      *  Requests to set the preferred network type for searching and registering
      * (CS/PS domain, RAT, and operation mode)

telephony/java/com/android/internal/telephony/RIL.java

@@ -1820,6 +1820,16 @@ public final class RIL extends BaseCommands implements CommandsInterface {
         send(rr);
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public void setCurrentPreferredNetworkType() {
+        if (RILJ_LOGD) riljLog("setCurrentPreferredNetworkType: " + mSetPreferredNetworkType);
+        setPreferredNetworkType(mSetPreferredNetworkType, null);
+    }
+    private int mSetPreferredNetworkType;
+
     /**
      * {@inheritDoc}
      */
@@ -1830,6 +1840,7 @@ public final class RIL extends BaseCommands implements CommandsInterface {
         rr.mp.writeInt(1);
         rr.mp.writeInt(networkType);
 
+        mSetPreferredNetworkType = networkType;
         mPreferredNetworkType = networkType;
 
         if (RILJ_LOGD) riljLog(rr.serialString() + "> " + requestToString(rr.mRequest)

telephony/java/com/android/internal/telephony/cdma/CdmaServiceStateTracker.java

@@ -257,6 +257,9 @@ public class CdmaServiceStateTracker extends ServiceStateTracker {
             break;
 
         case EVENT_RUIM_READY:
+            // TODO: Consider calling setCurrentPreferredNetworkType as we do in GsmSST.
+            // cm.setCurrentPreferredNetworkType();
+
             // The RUIM is now ready i.e if it was locked it has been
             // unlocked. At this stage, the radio is already powered on.
             isSubscriptionFromRuim = true;
@@ -277,6 +280,9 @@ public class CdmaServiceStateTracker extends ServiceStateTracker {
             break;
 
         case EVENT_NV_READY:
+            // TODO: Consider calling setCurrentPreferredNetworkType as we do in GsmSST.
+            // cm.setCurrentPreferredNetworkType();
+
             isSubscriptionFromRuim = false;
             // For Non-RUIM phones, the subscription information is stored in
             // Non Volatile. Here when Non-Volatile is ready, we can poll the CDMA

telephony/java/com/android/internal/telephony/gsm/GsmServiceStateTracker.java

@@ -270,6 +270,9 @@ final class GsmServiceStateTracker extends ServiceStateTracker {
                 break;
 
             case EVENT_SIM_READY:
+                // Set the network type, in case the radio does not restore it.
+                cm.setCurrentPreferredNetworkType();
+
                 // The SIM is now ready i.e if it was locked
                 // it has been unlocked. At this stage, the radio is already
                 // powered on.