Black screen patch for some HiSilicon devices (FBIOPAN_DISPLAY)

Change-Id: Ib114dcc7b48219142602a2fbc256e2a0258b26e0

minuitwrp/Android.mk

@@ -137,6 +137,9 @@ endif
 ifeq ($(TW_SCREEN_BLANK_ON_BOOT), true)
     LOCAL_CFLAGS += -DTW_SCREEN_BLANK_ON_BOOT
 endif
+ifeq ($(TW_FBIOPAN), true)
+    LOCAL_CFLAGS += -DTW_FBIOPAN
+endif
 
 ifeq ($(BOARD_HAS_FLIPPED_SCREEN), true)
 LOCAL_CFLAGS += -DBOARD_HAS_FLIPPED_SCREEN

minuitwrp/graphics_fbdev.cpp

@@ -103,6 +103,12 @@ static void set_displayed_framebuffer(unsigned n)
     vi.bits_per_pixel = gr_framebuffer[0].pixel_bytes * 8;
     if (ioctl(fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
         perror("active fb swap failed");
+#ifdef TW_FBIOPAN
+    } else {
+        if (ioctl(fb_fd, FBIOPAN_DISPLAY, &vi) < 0) {
+            perror("pan failed");
+        }
+#endif
     }
     displayed_buffer = n;
 }