hwc: Set HPD once at boot up

- HPD has to be set only once during boot up.
- This also helps in use case where HPD is turned off
  (on purpose)through by adb shell for power testing
  and on suspend/resume, it gets re-enabled.

Change-Id: I7bf6fdd08e719432029c5d6e5756685d36cdca43

libhwcomposer/hwc.cpp

@@ -475,10 +475,11 @@ static int hwc_setPowerMode(struct hwc_composer_device_1* dev, int dpy,
                 return -errno;
             }
 
-            if(mode == HWC_POWER_MODE_NORMAL) {
+            if(mode == HWC_POWER_MODE_NORMAL && !ctx->mHPDEnabled) {
                 // Enable HPD here, as during bootup POWER_MODE_NORMAL is set
                 // when SF is completely initialized
                 ctx->mHDMIDisplay->setHPD(1);
+                ctx->mHPDEnabled = true;
             }
 
             ctx->dpyAttr[dpy].isActive = not(mode == HWC_POWER_MODE_OFF);

libhwcomposer/hwc_utils.cpp

@@ -413,6 +413,7 @@ void initContext(hwc_context_t *ctx)
     }
 
     memset(&(ctx->mPtorInfo), 0, sizeof(ctx->mPtorInfo));
+    ctx->mHPDEnabled = false;
     ALOGI("Initializing Qualcomm Hardware Composer");
     ALOGI("MDP version: %d", ctx->mMDP.version);
 }

libhwcomposer/hwc_utils.h

@@ -644,6 +644,8 @@ struct hwc_context_t {
     bool mBWCEnabled;
     // Provides a way for OEM's to disable setting dynfps via metadata.
     bool mUseMetaDataRefreshRate;
+   // Stores the hpd enabled status- avoids re-enabling HDP on suspend resume.
+    bool mHPDEnabled;
 };
 
 namespace qhwc {