From 08305fd8a0f30bc731915d8d695d795e0cdf4e5e Mon Sep 17 00:00:00 2001
From: vhaudiquet <vhaudiquet@localhost>
Date: Sun, 30 Aug 2026 11:18:57 +0200
Subject: [PATCH] WIP (temporary): add misc_init_r checkpoint band + backlight
 re-assert

---
 board/mediatek/mt8183/mt8183.c       | 20 +++++++++++++++-----
 configs/mt8183_kukui_krane_defconfig |  1 +
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/board/mediatek/mt8183/mt8183.c b/board/mediatek/mt8183/mt8183.c
index ae342e3ddcc..69941675cbc 100644
--- a/board/mediatek/mt8183/mt8183.c
+++ b/board/mediatek/mt8183/mt8183.c
@@ -5,12 +5,13 @@
  */
 
 /*
- * TEMPORARY bring-up diagnostics (krane Round 13) — do not upstream.
+ * TEMPORARY bring-up diagnostics (krane Round 15) — do not upstream.
  * Paint colored bands into the live depthcharge scanout as early-init
- * checkpoints: full green = wrapper (before U-Boot), orange top band =
- * board_early_init_f, blue bottom band = dram_init_banksize, red top
- * band = board_early_init_r. The last one reached localizes the crash;
- * a successful video probe clears the screen for the banner.
+ * checkpoints: magenta full screen = wrapper (before U-Boot), orange
+ * top band = board_early_init_f, blue bottom band = dram_init_banksize,
+ * red top band = board_early_init_r, yellow band = misc_init_r (after
+ * the banner stage). The last one reached localizes the crash; a
+ * successful video probe clears the screen for the banner.
  */
 #include <cpu_func.h>
 #include <fdtdec.h>
@@ -60,6 +61,15 @@ int board_early_init_r(void)
 	return 0;
 }
 
+int misc_init_r(void)
+{
+	diag_paint(300, 60, 0x00ffff00);	/* yellow */
+	/* re-assert the backlight in case a probed driver cleared it */
+	writel(0x800, (void __iomem *)0x10005114);
+	writel(0x10000, (void __iomem *)0x10005154);
+	return 0;
+}
+
 /* end TEMPORARY diagnostics */
 
 #include <dm.h>
diff --git a/configs/mt8183_kukui_krane_defconfig b/configs/mt8183_kukui_krane_defconfig
index f97389fc95b..815d133ecd5 100644
--- a/configs/mt8183_kukui_krane_defconfig
+++ b/configs/mt8183_kukui_krane_defconfig
@@ -37,6 +37,7 @@ CONFIG_HUSH_PARSER=y
 CONFIG_BOOTDELAY=-1
 CONFIG_BOARD_EARLY_INIT_F=y
 CONFIG_BOARD_EARLY_INIT_R=y
+CONFIG_MISC_INIT_R=y
 # CONFIG_CMD_XIMG is not set
 # CONFIG_CMD_EXPORTENV is not set
 # CONFIG_CMD_IMPORTENV is not set