From 5d5abd863e8758447eb7e68baff022df1332b3cf Mon Sep 17 00:00:00 2001
From: Michael Bestas <mkbestas@lineageos.org>
Date: Sat, 23 Mar 2019 17:28:22 +0200
Subject: recovery: Blank screen on init

* Fixes touch on some devices like chiron/sagit

* Some other devices (e.g. most MTK) need this because their kernel driver
  implementations do not perform as expected (initial unblank is only
  happening when altering the panel brightness x -> 0 -> y). In regular
  Android, that "unblanking" is done on boot when the lights HAL loads and
  sets the initial brightness.

Change-Id: I2fffac508d09d07355a7a7f087805b0dceb5f97e
---
 Android.mk    | 4 ++++
 screen_ui.cpp | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/Android.mk b/Android.mk
index 5b3a2578..173f0b16 100644
--- a/Android.mk
+++ b/Android.mk
@@ -148,6 +148,10 @@ else
 LOCAL_CFLAGS += -DRECOVERY_UI_VR_STEREO_OFFSET=0
 endif
 
+ifeq ($(TARGET_RECOVERY_UI_BLANK_UNBLANK_ON_INIT),true)
+LOCAL_CFLAGS += -DRECOVERY_UI_BLANK_UNBLANK_ON_INIT
+endif
+
 ifneq ($(TARGET_RECOVERY_BACKLIGHT_PATH),)
 LOCAL_CFLAGS += -DBACKLIGHT_PATH=\"$(TARGET_RECOVERY_BACKLIGHT_PATH)\"
 else
diff --git a/screen_ui.cpp b/screen_ui.cpp
index d763343b..4fd11831 100644
--- a/screen_ui.cpp
+++ b/screen_ui.cpp
@@ -873,6 +873,11 @@ bool ScreenRecoveryUI::Init(const std::string& locale) {
     return false;
   }
 
+#ifdef RECOVERY_UI_BLANK_UNBLANK_ON_INIT
+  gr_fb_blank(true);
+  gr_fb_blank(false);
+#endif
+
   // Are we portrait or landscape?
   layout_ = (gr_fb_width() > gr_fb_height()) ? LANDSCAPE : PORTRAIT;
   // Are we the large variant of our base layout?
-- 
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