HWC: Disable SGX force usage if protected layer is detected.

Fixes b/5475085

In secure playback mode, SGX does not have access to protected buffers and a
forced SGX usage results in an invalid frame to be rendered and displayed. This
patch disables SGX force usage if any of the layers is protected.

Change-Id: I188cf1639050687a96df42b310c12875fec383f7
Signed-off-by: Sunita Nadampalli <sunitan@ti.com>
Signed-off-by: Iliyan Malchev <malchev@google.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/hwc/hwc.c b/hwc/hwc.c
index f4386d3..f13f53b 100644
--- a/hwc/hwc.c
+++ b/hwc/hwc.c
@@ -222,6 +222,13 @@ static int scaled(hwc_layer_t *layer)
     return WIDTH(layer->displayFrame) != w || HEIGHT(layer->displayFrame) != h;
 }
 
+static int isprotected(hwc_layer_t *layer)
+{
+    IMG_native_handle_t *handle = (IMG_native_handle_t *)layer->handle;
+
+    return (handle->usage & GRALLOC_USAGE_PROTECTED);
+}
+
 static int sync_id = 0;
 
 #define is_BLENDED(blending) ((blending) != HWC_BLENDING_NONE)
@@ -944,6 +951,12 @@ static int omap4_hwc_prepare(struct hwc_composer_device *dev, hwc_layer_list_t*
                 num.dockable++;
 
             num.mem += mem1d(handle);
+
+           /* Check if any of the layers are protected.
+           * if so, disable the SGX force usage
+           */
+            if (hwc_dev->force_sgx && isprotected(layer))
+                hwc_dev->force_sgx = 0;
         }
     }