From 3ac64db2aeded3bca12e8744a74794f6c981c791 Mon Sep 17 00:00:00 2001
From: Andrivet <sebastien@andrivet.com>
Date: Thu, 22 Jan 2026 17:41:28 +0100
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Fix=20TFT=20LVGL=20UI=20+=20Y-DI?=
 =?UTF-8?q?R=20conflict=20(#28291)?=
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Fixes #22967
---
 Marlin/src/HAL/STM32/MarlinSPI.cpp |  8 ++++++--
 Marlin/src/HAL/STM32/MarlinSPI.h   | 15 ++++++++++++---
 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/Marlin/src/HAL/STM32/MarlinSPI.cpp b/Marlin/src/HAL/STM32/MarlinSPI.cpp
index f7c603d77e..d109c65619 100644
--- a/Marlin/src/HAL/STM32/MarlinSPI.cpp
+++ b/Marlin/src/HAL/STM32/MarlinSPI.cpp
@@ -39,12 +39,16 @@ static void spi_init(spi_t *obj, uint32_t speed, spi_mode_e mode, uint8_t msb, u
 
 void MarlinSPI::setClockDivider(uint8_t _div) {
   _speed = spi_getClkFreq(&_spi);// / _div;
-  _clockDivider = _div;
+  if (_clockDivider != _div) {
+    _clockDivider = _div;
+    _mustInit = true;
+  }
 }
 
 void MarlinSPI::begin(void) {
-  //TODO: only call spi_init if any parameter changed!!
+  if (!_mustInit) return;
   spi_init(&_spi, _speed, _dataMode, _bitOrder, _dataSize);
+  _mustInit = false;
 }
 
 void MarlinSPI::setupDma(SPI_HandleTypeDef &_spiHandle, DMA_HandleTypeDef &_dmaHandle, uint32_t direction, bool minc) {
diff --git a/Marlin/src/HAL/STM32/MarlinSPI.h b/Marlin/src/HAL/STM32/MarlinSPI.h
index fbd3585ff4..1c106de364 100644
--- a/Marlin/src/HAL/STM32/MarlinSPI.h
+++ b/Marlin/src/HAL/STM32/MarlinSPI.h
@@ -76,15 +76,23 @@ public:
   /* These methods are deprecated and kept for compatibility.
    * Use SPISettings with SPI.beginTransaction() to configure SPI parameters.
    */
-  void setBitOrder(BitOrder _order) { _bitOrder = _order; }
+  void setBitOrder(BitOrder order) {
+    if (_bitOrder == order) return;
+    _bitOrder = order;
+    _mustInit = true;
+  }
 
-  void setDataMode(uint8_t _mode) {
-    switch (_mode) {
+  void setDataMode(uint8_t mode) {
+    auto previous_mode = _dataMode;
+    switch (mode) {
       case SPI_MODE0: _dataMode = SPI_MODE_0; break;
       case SPI_MODE1: _dataMode = SPI_MODE_1; break;
       case SPI_MODE2: _dataMode = SPI_MODE_2; break;
       case SPI_MODE3: _dataMode = SPI_MODE_3; break;
+      default: return;
     }
+    if (previous_mode != _dataMode)
+      _mustInit = true;
   }
 
   void setClockDivider(uint8_t _div);
@@ -104,4 +112,5 @@ private:
   pin_t _misoPin;
   pin_t _sckPin;
   pin_t _ssPin;
+  bool _mustInit = true;
 };