diff --git a/boards/base/STM32F429i-Discovery/chibios/board_STM32LTDC.h b/boards/base/STM32F429i-Discovery/chibios/board_STM32LTDC.h
index 274f4890..a6e41f86 100644
--- a/boards/base/STM32F429i-Discovery/chibios/board_STM32LTDC.h
+++ b/boards/base/STM32F429i-Discovery/chibios/board_STM32LTDC.h
@@ -189,6 +189,7 @@ static void init_board(GDisplay *g) {
 	RCC->PLLSAICFGR = (STM32_PLLSAIN_VALUE << 6) | (STM32_PLLSAIR_VALUE << 28) | (STM32_PLLSAIQ_VALUE << 24);
 	RCC->DCKCFGR = (RCC->DCKCFGR & ~RCC_DCKCFGR_PLLSAIDIVR) | STM32_PLLSAIR_POST;
 	RCC->CR |= RCC_CR_PLLSAION;
+	while(!(RCC->CR & RCC_CR_PLLSAIRDY));			// wait for PLLSAI to lock
 
 	// Initialise the SDRAM
 	SDRAM_Init();
diff --git a/boards/base/STM32F439i-Eval/CubeHal/board_STM32LTDC.h b/boards/base/STM32F439i-Eval/CubeHal/board_STM32LTDC.h
index fd9a32ca..a2c99be6 100644
--- a/boards/base/STM32F439i-Eval/CubeHal/board_STM32LTDC.h
+++ b/boards/base/STM32F439i-Eval/CubeHal/board_STM32LTDC.h
@@ -89,6 +89,7 @@ static void configureLcdClock(void)
 		RCC->PLLSAICFGR = (LCD_PLLSAIN_VALUE << 6) | (LCD_PLLSAIR_VALUE << 28) | (LCD_PLLSAIQ_VALUE << 24);
 		RCC->DCKCFGR = (RCC->DCKCFGR & ~RCC_DCKCFGR_PLLSAIDIVR) | LCD_PLLSAIDIVR_VALUE;
 		RCC->CR |= RCC_CR_PLLSAION;
+		while(!(RCC->CR & RCC_CR_PLLSAIRDY));			// wait for PLLSAI to lock
 	#endif
 }
 
diff --git a/boards/base/STM32F469i-Discovery/CubeHAL/board_STM32LTDC.h b/boards/base/STM32F469i-Discovery/CubeHAL/board_STM32LTDC.h
index 00a66c21..87f70603 100644
--- a/boards/base/STM32F469i-Discovery/CubeHAL/board_STM32LTDC.h
+++ b/boards/base/STM32F469i-Discovery/CubeHAL/board_STM32LTDC.h
@@ -104,8 +104,9 @@ static GFXINLINE void init_board(GDisplay *g) {
   RCC->PLLSAICFGR = (STM32_PLLSAIN_VALUE << 6) | (STM32_PLLSAIR_VALUE << 28) | (STM32_PLLSAIQ_VALUE << 24);
   RCC->DCKCFGR = (RCC->DCKCFGR & ~RCC_DCKCFGR_PLLSAIDIVR) | STM32_PLLSAIR_POST;
   RCC->CR |= RCC_CR_PLLSAION;
+  while(!(RCC->CR & RCC_CR_PLLSAIRDY));			// wait for PLLSAI to lock
 #endif
-    
+
   __HAL_RCC_DSI_CLK_ENABLE();
 
   DSI_PLLInitTypeDef  dsiPllInit;
@@ -119,7 +120,7 @@ static GFXINLINE void init_board(GDisplay *g) {
   /* TXEscapeCkdiv = f(LaneByteClk)/15.62 = 4 -> 500MHz/4 = 25MHz datasheet says around 20MHz */
   dsiHandle.Init.TXEscapeCkdiv             = laneByteClk_kHz/15620;          // Low power clock relative to the laneByteClock
   dsiHandle.Init.NumberOfLanes             = DSI_TWO_DATA_LANES;             // Two data lines for the fastest transfer speed
-  
+
   /* Fill in the command mode struct. */
   dsiCmdMode.VirtualChannelID              = 0;                              // The first virtual channel
 
@@ -139,7 +140,7 @@ static GFXINLINE void init_board(GDisplay *g) {
   dsiCmdMode.VSyncPol               = DSI_VSYNC_FALLING;
   dsiCmdMode.AutomaticRefresh       = DSI_AR_ENABLE;               // Use the automatic refresh mode
   dsiCmdMode.TEAcknowledgeRequest   = DSI_TE_ACKNOWLEDGE_DISABLE;  // Not needed when using TE through GPIO
-  
+
   /* GPIO configuration. */
   GPIO_InitTypeDef  gpioInit;
   /* PH7  LCD_RESET */
@@ -149,14 +150,14 @@ static GFXINLINE void init_board(GDisplay *g) {
   gpioInit.Pull  = GPIO_NOPULL;
   gpioInit.Speed = GPIO_SPEED_HIGH;
   HAL_GPIO_Init(GPIOH, &gpioInit);
-  
+
   /* PJ2  DSIHOST_TE */
   __HAL_RCC_GPIOJ_CLK_ENABLE();
   gpioInit.Pin        = GPIO_PIN_2;
   gpioInit.Mode       = GPIO_MODE_AF_PP;
   gpioInit.Alternate  = GPIO_AF13_DSI;
   HAL_GPIO_Init(GPIOJ, &gpioInit);
-  
+
   /* PA3  LCD_BL_CTRL This pin is not physically connected. */
   __HAL_RCC_GPIOA_CLK_ENABLE();
   gpioInit.Pin        = GPIO_PIN_3;
@@ -177,7 +178,7 @@ static GFXINLINE void init_board(GDisplay *g) {
 
   /* Initialize the DSI peripheral. */
   HAL_DSI_Init(&dsiHandle, &dsiPllInit);
-  
+
   DSI_PHY_TimerTypeDef  PhyTimings;
   /* Configure DSI PHY HS2LP and LP2HS timings. Datasheet says 95ns max */
   PhyTimings.ClockLaneHS2LPTime   = 35;
@@ -189,8 +190,8 @@ static GFXINLINE void init_board(GDisplay *g) {
   HAL_DSI_ConfigPhyTimer(&dsiHandle, &PhyTimings);
 
   /* Configure adapted command mode. */
-  HAL_DSI_ConfigAdaptedCommandMode(&dsiHandle, &dsiCmdMode);  
-  
+  HAL_DSI_ConfigAdaptedCommandMode(&dsiHandle, &dsiCmdMode);
+
   /* Hardware reset LCD */
   reset_lcd(g);
 
@@ -230,7 +231,7 @@ static GFXINLINE void post_init_board(GDisplay* g)
 {
   (void)g;
   DSI_LPCmdTypeDef dsiAPBCmd;
-  
+
   /* Enable the DSI host and wrapper after the LTDC initialization
   To avoid any synchronization issue, the DSI shall be started after enabling the LTDC */
   HAL_DSI_Start(&dsiHandle);
@@ -249,7 +250,7 @@ static GFXINLINE void post_init_board(GDisplay* g)
   dsiAPBCmd.LPDcsShortReadNoP     = DSI_LP_DSR0P_ENABLE;
   dsiAPBCmd.LPDcsLongWrite        = DSI_LP_DLW_ENABLE;
   HAL_DSI_ConfigCommand(&dsiHandle, &dsiAPBCmd);
-  
+
   /* Configure the LCD. */
 #ifdef GDISP_PIXELFORMAT_RGB565
   OTM8009A_Init(OTM8009A_FORMAT_RBG565, 1);
@@ -259,7 +260,7 @@ static GFXINLINE void post_init_board(GDisplay* g)
 
   /* Enable the tearing effect line. */
   HAL_DSI_ShortWrite(&dsiHandle, 0, DSI_DCS_SHORT_PKT_WRITE_P1, DSI_SET_TEAR_ON, 0);  // Only V-Blanking info
-  
+
   /* Disable the APB command mode again to go into adapted command mode. (going into high speed mode) */
   dsiAPBCmd.LPGenShortWriteNoP    = DSI_LP_GSW0P_DISABLE;
   dsiAPBCmd.LPGenShortWriteOneP   = DSI_LP_GSW1P_DISABLE;
@@ -273,7 +274,7 @@ static GFXINLINE void post_init_board(GDisplay* g)
   dsiAPBCmd.LPDcsShortReadNoP     = DSI_LP_DSR0P_DISABLE;
   dsiAPBCmd.LPDcsLongWrite        = DSI_LP_DLW_DISABLE;
   HAL_DSI_ConfigCommand(&dsiHandle, &dsiAPBCmd);
-    
+
   HAL_DSI_Refresh(&dsiHandle);
 }
 
diff --git a/boards/base/STM32F746-Discovery/board_STM32LTDC.h b/boards/base/STM32F746-Discovery/board_STM32LTDC.h
index 8ad0dfa4..55a322b6 100644
--- a/boards/base/STM32F746-Discovery/board_STM32LTDC.h
+++ b/boards/base/STM32F746-Discovery/board_STM32LTDC.h
@@ -450,6 +450,7 @@ static GFXINLINE void init_board(GDisplay *g) {
 			RCC->PLLSAICFGR = ((STM32_PLLSAIP_VALUE/2-1)<<16) | (STM32_PLLSAIN_VALUE << 6) | (STM32_PLLSAIR_VALUE << 28) | (STM32_PLLSAIQ_VALUE << 24);
 			RCC->DCKCFGR1 = (RCC->DCKCFGR1 & ~RCC_DCKCFGR1_PLLSAIDIVR) | STM32_PLLSAIR_POST;
 			RCC->CR |= RCC_CR_PLLSAION;
+			while(!(RCC->CR & RCC_CR_PLLSAIRDY));			// wait for PLLSAI to lock
 	#endif
 
 	// Initialise the SDRAM