Add ro.vendor.build.dont_use_vabc to disable VABC OTA

This prop is owned by OEM, OEM can set this if they want to disable
VABC.

Test: m dist, make sure generated OTA has VABC disabled
Bug: 185400304

Change-Id: Iceb2fb1f399d38a51722352a86ddf68af05fa24e
Merged-In: Iceb2fb1f399d38a51722352a86ddf68af05fa24e

core/main.mk

@@ -313,6 +313,13 @@ ADDITIONAL_VENDOR_PROPERTIES += \
 endif
 endif
 
+# Set build prop. This prop is read by ota_from_target_files when generating OTA,
+# to decide if VABC should be disabled.
+ifeq ($(BOARD_DONT_USE_VABC_OTA),true)
+ADDITIONAL_VENDOR_PROPERTIES += \
+    ro.vendor.build.dont_use_vabc=true
+endif
+
 ADDITIONAL_VENDOR_PROPERTIES += \
     ro.vendor.build.security_patch=$(VENDOR_SECURITY_PATCH) \
     ro.product.board=$(TARGET_BOOTLOADER_BOARD_NAME) \

tools/releasetools/common.py

@@ -450,6 +450,13 @@ class BuildInfo(object):
         vendor_prop.GetProp("ro.virtual_ab.compression.enabled") == "true"
     return vabc_enabled
 
+  @property
+  def vendor_suppressed_vabc(self):
+    vendor_prop = self.info_dict.get("vendor.build.prop")
+    vabc_suppressed = vendor_prop and \
+        vendor_prop.GetProp("ro.vendor.build.dont_use_vabc")
+    return vabc_suppressed and vabc_suppressed.lower() == "true"
+
   @property
   def oem_props(self):
     return self._oem_props

tools/releasetools/ota_from_target_files.py

@@ -1063,6 +1063,7 @@ def GenerateAbOtaPackage(target_file, output_file, source_file=None):
     # serve I/O request when device boots. Therefore, disable VABC if source
     # build doesn't supports it.
     if not source_info.is_vabc or not target_info.is_vabc:
+      logger.info("Either source or target does not support VABC, disabling.")
       OPTIONS.disable_vabc = True
 
   else:
@@ -1071,6 +1072,9 @@ def GenerateAbOtaPackage(target_file, output_file, source_file=None):
     target_info = common.BuildInfo(OPTIONS.info_dict, OPTIONS.oem_dicts)
     source_info = None
 
+  if target_info.vendor_suppressed_vabc:
+    logger.info("Vendor suppressed VABC. Disabling")
+    OPTIONS.disable_vabc = True
   additional_args = []
 
   # Prepare custom images.