diff --git a/graphics/common/aidl/android/hardware/graphics/common/BufferUsage.aidl b/graphics/common/aidl/android/hardware/graphics/common/BufferUsage.aidl
index 12bc441..0d1a094 100644
--- a/graphics/common/aidl/android/hardware/graphics/common/BufferUsage.aidl
+++ b/graphics/common/aidl/android/hardware/graphics/common/BufferUsage.aidl
@@ -24,35 +24,47 @@
 @Backing(type="long")
 enum BufferUsage {
     /** bit 0-3 is an enum */
-    CPU_READ_MASK                      = 0xf,
+    CPU_READ_MASK = 0xf,
     /** buffer is never read by CPU */
-    CPU_READ_NEVER                     = 0,
+    CPU_READ_NEVER = 0,
     /** buffer is rarely read by CPU */
-    CPU_READ_RARELY                    = 2,
+    CPU_READ_RARELY = 2,
     /** buffer is often read by CPU */
-    CPU_READ_OFTEN                     = 3,
+    CPU_READ_OFTEN = 3,
 
     /** bit 4-7 is an enum */
-    CPU_WRITE_MASK                     = 0xf << 4,
+    CPU_WRITE_MASK = 0xf << 4,
     /** buffer is never written by CPU */
-    CPU_WRITE_NEVER                    = 0 << 4,
+    CPU_WRITE_NEVER = 0 << 4,
     /** buffer is rarely written by CPU */
-    CPU_WRITE_RARELY                   = 2 << 4,
+    CPU_WRITE_RARELY = 2 << 4,
     /** buffer is often written by CPU */
-    CPU_WRITE_OFTEN                    = 3 << 4,
+    CPU_WRITE_OFTEN = 3 << 4,
 
-    /** buffer is used as a GPU texture */
-    GPU_TEXTURE                        = 1 << 8,
+    /**
+     * Buffer may be used as a GPU texture
+     *
+     * Buffers allocated with this flag must be
+     * texturable both in EGL/GL & Vulkan via
+     * their respective external memory extensions
+     */
+    GPU_TEXTURE = 1 << 8,
 
-    /** buffer is used as a GPU render target */
-    GPU_RENDER_TARGET                  = 1 << 9,
+    /**
+     * Buffer may be used as a GPU render target
+     *
+     * Buffers allocated with this flag must be
+     * renderable both in EGL/GL & Vulkan via
+     * their respective external memory extensions
+     */
+    GPU_RENDER_TARGET = 1 << 9,
 
     /** bit 10 must be zero */
 
     /** buffer is used as a composer HAL overlay layer */
-    COMPOSER_OVERLAY                   = 1 << 11,
+    COMPOSER_OVERLAY = 1 << 11,
     /** buffer is used as a composer HAL client target */
-    COMPOSER_CLIENT_TARGET             = 1 << 12,
+    COMPOSER_CLIENT_TARGET = 1 << 12,
 
     /** bit 13 must be zero */
 
@@ -61,86 +73,86 @@
      * contents (or information derived from the contents) into unprotected
      * memory.
      */
-    PROTECTED                          = 1 << 14,
+    PROTECTED = 1 << 14,
 
     /** buffer is used as a hwcomposer HAL cursor layer */
-    COMPOSER_CURSOR                    = 1 << 15,
+    COMPOSER_CURSOR = 1 << 15,
 
     /** buffer is used as a video encoder input */
-    VIDEO_ENCODER                      = 1 << 16,
+    VIDEO_ENCODER = 1 << 16,
 
     /** buffer is used as a camera HAL output */
-    CAMERA_OUTPUT                      = 1 << 17,
+    CAMERA_OUTPUT = 1 << 17,
 
     /** buffer is used as a camera HAL input */
-    CAMERA_INPUT                       = 1 << 18,
+    CAMERA_INPUT = 1 << 18,
 
     /** bit 19 must be zero */
 
     /** buffer is used as a renderscript allocation */
-    RENDERSCRIPT                       = 1 << 20,
+    RENDERSCRIPT = 1 << 20,
 
     /** bit 21 must be zero */
 
     /** buffer is used as a video decoder output */
-    VIDEO_DECODER                      = 1 << 22,
+    VIDEO_DECODER = 1 << 22,
 
     /** buffer is used as a sensor direct report output */
-    SENSOR_DIRECT_DATA                 = 1 << 23,
+    SENSOR_DIRECT_DATA = 1 << 23,
 
     /**
      * buffer is used as as an OpenGL shader storage or uniform
      * buffer object
      */
-    GPU_DATA_BUFFER                    = 1 << 24,
+    GPU_DATA_BUFFER = 1 << 24,
 
     /** buffer is used as a cube map texture */
-    GPU_CUBE_MAP                       = 1 << 25,
+    GPU_CUBE_MAP = 1 << 25,
 
     /** buffer contains a complete mipmap hierarchy */
-    GPU_MIPMAP_COMPLETE                = 1 << 26,
+    GPU_MIPMAP_COMPLETE = 1 << 26,
 
     /**
      * Buffer is used as input for HEIC encoder.
      */
-    HW_IMAGE_ENCODER                   = 1 << 27,
+    HW_IMAGE_ENCODER = 1 << 27,
 
     /* Bits 28-31 are reserved for vendor usage */
 
     /**
-    * Buffer is used for front-buffer rendering.
-    *
-    * To satisfy an allocation with this usage, the resulting buffer
-    * must operate as equivalent to shared memory for all targets.
-    *
-    * For CPU_USAGE_* other than NEVER, this means the buffer must
-    * "lock in place". The buffers must be directly accessible via mapping.
-    *
-    * For GPU_RENDER_TARGET the buffer must behave equivalent to a
-    * single-buffered EGL surface. For example glFlush must perform
-    * a flush, same as if the default framebuffer was single-buffered.
-    *
-    * For COMPOSER_* the HWC must not perform any caching for this buffer
-    * when submitted for composition. HWCs do not need to do any form
-    * of auto-refresh, and they are allowed to cache composition results between
-    * presents from SF (such as for panel self-refresh), but for any given
-    * present the buffer must be composited from even if it otherwise appears
-    * to be the same as a previous composition.
-    *
-    * If the GPU & HWC supports EGL_SINGLE_BUFFER, then it is recommended that
-    * FRONT_BUFFER usage is supported for the same formats as supported by
-    * EGL_SINGLE_BUFFER. In particular, it is recommended that the following
-    * combination is supported when possible:
-    *    Format = RGBA_8888
-    *    Usage = FRONT_BUFFER | GPU_RENDER_TARGET | COMPOSER_OVERLAY
-    *
-    */
-    FRONT_BUFFER                       = 1L << 32,
+     * Buffer is used for front-buffer rendering.
+     *
+     * To satisfy an allocation with this usage, the resulting buffer
+     * must operate as equivalent to shared memory for all targets.
+     *
+     * For CPU_USAGE_* other than NEVER, this means the buffer must
+     * "lock in place". The buffers must be directly accessible via mapping.
+     *
+     * For GPU_RENDER_TARGET the buffer must behave equivalent to a
+     * single-buffered EGL surface. For example glFlush must perform
+     * a flush, same as if the default framebuffer was single-buffered.
+     *
+     * For COMPOSER_* the HWC must not perform any caching for this buffer
+     * when submitted for composition. HWCs do not need to do any form
+     * of auto-refresh, and they are allowed to cache composition results between
+     * presents from SF (such as for panel self-refresh), but for any given
+     * present the buffer must be composited from even if it otherwise appears
+     * to be the same as a previous composition.
+     *
+     * If the GPU & HWC supports EGL_SINGLE_BUFFER, then it is recommended that
+     * FRONT_BUFFER usage is supported for the same formats as supported by
+     * EGL_SINGLE_BUFFER. In particular, it is recommended that the following
+     * combination is supported when possible:
+     *    Format = RGBA_8888
+     *    Usage = FRONT_BUFFER | GPU_RENDER_TARGET | COMPOSER_OVERLAY
+     *
+     */
+    FRONT_BUFFER = 1L << 32,
 
     /** bits 28-31 are reserved for vendor extensions */
-    VENDOR_MASK                        = 0xf << 28,
+    VENDOR_MASK = 0xf << 28,
 
     /** bits 33-47 must be zero and are reserved for future versions */
     /** bits 48-63 are reserved for vendor extensions */
-    VENDOR_MASK_HI                     = (1L * 0xffff) << 48,
+    VENDOR_MASK_HI = (1L * 0xffff) << 48,
 }