Working LCD_USE_DMA_FSMC (#19522)

Marlin/src/HAL/STM32F1/tft/tft_fsmc.cpp

   uint8_t cs = FSMC_CS_PIN, rs = FSMC_RS_PIN;
   uint32_t controllerAddress;
 
+  #if PIN_EXISTS(TFT_BACKLIGHT)
+    OUT_WRITE(TFT_BACKLIGHT_PIN, DISABLED(DELAYED_BACKLIGHT_INIT));
+  #endif
+
+  #if ENABLED(LCD_USE_DMA_FSMC)
+    dma_init(FSMC_DMA_DEV);
+    dma_disable(FSMC_DMA_DEV, FSMC_DMA_CHANNEL);
+    dma_set_priority(FSMC_DMA_DEV, FSMC_DMA_CHANNEL, DMA_PRIORITY_MEDIUM);
+  #endif
+
   #if PIN_EXISTS(TFT_RESET)
     OUT_WRITE(TFT_RESET_PIN, HIGH);
     delay(100);

Marlin/src/pins/stm32f1/pins_LONGER3D_LK.h

 #define FSMC_CS_PIN                         PD7   // pin 88 = FSMC_NE1
 #define FSMC_RS_PIN                         PD11  // pin 58 A16 Register. Only one address needed
 
-//#define LCD_USE_DMA_FSMC                        // Use DMA transfers to send data to the TFT (broken)
+#define LCD_USE_DMA_FSMC                          // Use DMA transfers to send data to the TFT
 #define FSMC_DMA_DEV                        DMA2
 #define FSMC_DMA_CHANNEL                 DMA_CH5