hwc: Add support for Secure display

- Identify secure display layer in the hwc_list
- Need to set both SECURE_OVERLAY and SECURE_DISPLAY flags for the secure
  display layer
- Disable idle timeout for secure display usecase, as GPU should not be
  accessing secure display layer

Change-Id: I555910db77c466b5e103b24b4f0ec7f47bb210a5

libhwcomposer/hwc_utils.cpp

@@ -710,6 +710,7 @@ void setListStats(hwc_context_t *ctx,
     ctx->listStats[dpy].isDisplayAnimating = false;
     ctx->listStats[dpy].roi = ovutils::Dim(0, 0,
                       (int)ctx->dpyAttr[dpy].xres, (int)ctx->dpyAttr[dpy].yres);
+    ctx->listStats[dpy].secureUI = false;
 
     optimizeLayerRects(ctx, list, dpy);
 
@@ -721,6 +722,9 @@ void setListStats(hwc_context_t *ctx,
         if (layer->flags & HWC_SCREENSHOT_ANIMATOR_LAYER) {
             ctx->listStats[dpy].isDisplayAnimating = true;
         }
+        if(isSecureDisplayBuffer(hnd)) {
+            ctx->listStats[dpy].secureUI = true;
+        }
 #endif
         // continue if number of app layers exceeds MAX_NUM_APP_LAYERS
         if(ctx->listStats[dpy].numAppLayers > MAX_NUM_APP_LAYERS)
@@ -1246,6 +1250,13 @@ void setMdpFlags(hwc_layer_1_t *layer,
         }
     }
 
+    if(isSecureDisplayBuffer(hnd)) {
+        // Secure display needs both SECURE_OVERLAY and SECURE_DISPLAY_OV
+        ovutils::setMdpFlags(mdpFlags,
+                             ovutils::OV_MDP_SECURE_OVERLAY_SESSION);
+        ovutils::setMdpFlags(mdpFlags,
+                             ovutils::OV_MDP_SECURE_DISPLAY_OVERLAY_SESSION);
+    }
     //No 90 component and no rot-downscale then flips done by MDP
     //If we use rot then it might as well do flips
     if(!(transform & HWC_TRANSFORM_ROT_90) && !rotDownscale) {