From ab9d7dd583230f161c15e2645c07ee72a6a813af Mon Sep 17 00:00:00 2001
From: Platinplayer23 <pascalsuthe@googlemail.com>
Date: Mon, 27 Oct 2025 21:54:19 +0100
Subject: [PATCH] =?UTF-8?q?Fix=20TS101=20PD=20negotiation=20regression=20(?=
 =?UTF-8?q?v2.22=20=E2=86=92=20v2.23)?=
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Add special build rule for policy_engine.cpp to use -O1 optimization
instead of -Os. This prevents aggressive compiler optimizations that
disrupt timing-critical I2C communication with the FUSB302 PD controller.

Root cause: Compiler update in commit 849d1f7d (Alpine 3.16 GCC 11.x
to Alpine 3.19+ GCC 14.x) introduced aggressive optimizations.

Fixes boot loops on TS101 when connected to USB-C power sources that
worked with v2.22 but fail with v2.23+.

Tested on TS101 with 100W USB-C power bank.
---
 source/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/source/Makefile b/source/Makefile
index d97b10cd3..2201d171c 100644
--- a/source/Makefile
+++ b/source/Makefile
@@ -538,6 +538,11 @@ $(OUT_OBJS): $(OUTPUT_DIR)/%.o: %.c Makefile
 	@test -d $(@D) || mkdir -p $(@D)
 	@$(CC) -c $(CFLAGS) $< -o $@
 
+
+# Special rule for policy_engine.cpp - use O1 optimization
+$(OUTPUT_DIR)/Core/Drivers/usb-pd/src/policy_engine.o: Core/Drivers/usb-pd/src/policy_engine.cpp Makefile
+	@test -d $(@D) || mkdir -p $(@D)
+	@$(CPP) -c -O1 $(filter-out -Os -O3 -O2,$(CXXFLAGS)) $< -o $@
 $(OUTPUT_DIR)/%.o: %.cpp Makefile
 	@test -d $(@D) || mkdir -p $(@D)
 	@$(CPP) -c $(CXXFLAGS) $< -o $@