From 0b9d2e3ac9421e1b76d1be003951f9c9f3826e66 Mon Sep 17 00:00:00 2001
From: tychovrahe <brunam@seznam.cz>
Date: Fri, 31 Jan 2025 12:25:49 +0100
Subject: [PATCH] feat(core): lazy initialize display driver in boardloader

[no changelog]
---
 core/embed/projects/boardloader/main.c      | 5 +++++
 core/embed/projects/boardloader/sd_update.c | 6 ++++++
 2 files changed, 11 insertions(+)

diff --git a/core/embed/projects/boardloader/main.c b/core/embed/projects/boardloader/main.c
index a64583ee21..b696b8cadf 100644
--- a/core/embed/projects/boardloader/main.c
+++ b/core/embed/projects/boardloader/main.c
@@ -85,7 +85,12 @@ static void drivers_init(void) {
 #ifdef USE_HASH_PROCESSOR
   hash_processor_init();
 #endif
+#ifndef FIXED_HW_DEINIT
+  // only skip this if deinit was fixed,
+  // as some old bootloaders rely on display being initialized
+  // (skipping alows faster boot time so generally a good idea)
   display_init(DISPLAY_RESET_CONTENT);
+#endif
 }
 
 static void drivers_deinit(void) {
diff --git a/core/embed/projects/boardloader/sd_update.c b/core/embed/projects/boardloader/sd_update.c
index fa5bd11fa7..8837cb553b 100644
--- a/core/embed/projects/boardloader/sd_update.c
+++ b/core/embed/projects/boardloader/sd_update.c
@@ -160,7 +160,13 @@ void sd_update_check_and_update(const uint8_t *const *keys, uint8_t key_m,
   }
 
   if (check_sdcard(keys, key_m, key_n) != 0) {
+#ifdef FIXED_HW_DEINIT
+    display_init(DISPLAY_RESET_CONTENT);
+#endif
     copy_sdcard(keys, key_m, key_n);
+#ifdef FIXED_HW_DEINIT
+    display_deinit(DISPLAY_RETAIN_CONTENT);
+#endif
     reboot_or_halt_after_rsod();
   }
 }