Suspend to low power mode on T3W1

core/Makefile

@@ -307,7 +307,7 @@ build_reflash: ## build reflash firmware + reflash image
 	dd if=build/bootloader/bootloader.bin of=$(REFLASH_BUILD_DIR)/sdimage.bin bs=1 seek=49152
 
 build_kernel: ## build kernel image
-	$(SCONS) PYOPT=1 $(KERNEL_BUILD_DIR)/kernel.bin
+	$(SCONS) $(KERNEL_BUILD_DIR)/kernel.bin
 
 build_firmware: templates build_cross build_kernel ## build firmware with frozen modules
 	$(SCONS) $(FIRMWARE_BUILD_DIR)/firmware.bin

core/embed/gfx/bitblt/dma2d_bitblt.h

@@ -25,6 +25,9 @@
 // Initializes DMA2D peripheral
 void dma2d_init(void);
 
+// Deinitializes DMA2D peripheral
+void dma2d_deinit(void);
+
 // Waits until any pending DMA2D operation is finished
 void dma2d_wait(void);
 

core/embed/gfx/bitblt/gfx_bitblt.c

@@ -25,6 +25,12 @@ void gfx_bitblt_init(void) {
 #endif
 }
 
+void gfx_bitblt_deinit(void) {
+#if defined(USE_DMA2D) && !defined(TREZOR_EMULATOR)
+  dma2d_deinit();
+#endif
+}
+
 void gfx_bitblt_wait(void) {
 #if defined(USE_DMA2D) && !defined(TREZOR_EMULATOR)
   dma2d_wait();

core/embed/gfx/bitblt/stm32/dma2d_bitblt.c

@@ -40,7 +40,19 @@ static inline bool dma2d_accessible(const void* ptr) {
 #endif
 }
 
-void dma2d_init(void) { __HAL_RCC_DMA2D_CLK_ENABLE(); }
+void dma2d_init(void) {
+  __HAL_RCC_DMA2D_FORCE_RESET();
+  __HAL_RCC_DMA2D_RELEASE_RESET();
+
+  __HAL_RCC_DMA2D_CLK_ENABLE();
+}
+
+void dma2d_deinit(void) {
+  __HAL_RCC_DMA2D_CLK_DISABLE();
+
+  __HAL_RCC_DMA2D_FORCE_RESET();
+  __HAL_RCC_DMA2D_RELEASE_RESET();
+}
 
 void dma2d_wait(void) {
   while (HAL_DMA2D_PollForTransfer(&dma2d_handle, 10) != HAL_OK)

core/embed/gfx/inc/gfx/gfx_bitblt.h

@@ -78,6 +78,9 @@ typedef struct {
 // Initializes bitblt operations
 void gfx_bitblt_init(void);
 
+// Deinitializes bitblt operations
+void gfx_bitblt_deinit(void);
+
 // If the bitblt operation is asynchronous, waits until it's finished
 void gfx_bitblt_wait(void);
 

core/embed/io/button/inc/io/button.h

@@ -49,6 +49,9 @@ typedef enum {
 // Returns true in case of success, false otherwise
 bool button_init(void);
 
+// Deinitializes button driver
+void button_deinit(void);
+
 #endif  // KERNEL_MODE
 
 // Get the last button event

core/embed/io/button/stm32/button.c

@@ -22,6 +22,7 @@
 
 #include <io/button.h>
 #include <sys/irq.h>
+#include <sys/mpu.h>
 
 #ifdef USE_POWERCTL
 #include <sys/wakeup_flags.h>
@@ -103,6 +104,12 @@ bool button_init(void) {
   return true;
 }
 
+void button_deinit(void) {
+#ifdef BTN_EXIT_INTERRUPT_HANDLER
+  NVIC_DisableIRQ(BTN_EXTI_INTERRUPT_NUM);
+#endif
+}
+
 uint32_t button_get_event(void) {
   button_driver_t *drv = &g_button_driver;
 
@@ -182,6 +189,9 @@ bool button_is_down(button_t button) {
 
 #ifdef BTN_EXTI_INTERRUPT_HANDLER
 void BTN_EXTI_INTERRUPT_HANDLER(void) {
+  IRQ_LOG_ENTER();
+  mpu_mode_t mpu_mode = mpu_reconfig(MPU_MODE_DEFAULT);
+
   // button_driver_t *drv = &g_button_driver;
 
   // Clear the EXTI line pending bit
@@ -191,6 +201,9 @@ void BTN_EXTI_INTERRUPT_HANDLER(void) {
   // Inform the powerctl module about button press
   wakeup_flags_set(WAKEUP_FLAG_BUTTON);
 #endif
+
+  mpu_restore(mpu_mode);
+  IRQ_LOG_EXIT();
 }
 #endif
 

core/embed/io/display/backlight/stm32/backlight_pwm.c

@@ -68,11 +68,9 @@ void backlight_pwm_init(backlight_action_t action) {
     }
   }
 
-  // Enable peripheral clocks
+  // Initialize PWM GPIO
   BACKLIGHT_PWM_PORT_CLK_EN();
-  BACKLIGHT_PWM_TIM_CLK_EN();
 
-  // Initialize PWM GPIO
   GPIO_InitTypeDef GPIO_InitStructure = {0};
   GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
   GPIO_InitStructure.Pull = GPIO_NOPULL;
@@ -82,6 +80,9 @@ void backlight_pwm_init(backlight_action_t action) {
   HAL_GPIO_Init(BACKLIGHT_PWM_PORT, &GPIO_InitStructure);
 
   // Initialize PWM timer
+  BACKLIGHT_PWM_TIM_FORCE_RESET();
+  BACKLIGHT_PWM_TIM_RELEASE_RESET();
+  BACKLIGHT_PWM_TIM_CLK_EN();
 
   uint32_t tmpcr1 = 0;
 
@@ -220,8 +221,19 @@ void backlight_pwm_deinit(backlight_action_t action) {
 
 #else
   if (action == BACKLIGHT_RESET) {
-    // TODO: reset TIMER and GPIO
-    BACKLIGHT_PWM_TIM->BACKLIGHT_PWM_TIM_CCR = 0;
+    // Deinitialize PWM GPIO
+    GPIO_InitTypeDef GPIO_InitStructure = {0};
+    GPIO_InitStructure.Mode = GPIO_MODE_ANALOG;
+    GPIO_InitStructure.Pull = GPIO_NOPULL;
+    GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStructure.Pin = BACKLIGHT_PWM_PIN;
+    HAL_GPIO_Init(BACKLIGHT_PWM_PORT, &GPIO_InitStructure);
+
+    // Deinitialize PWM timer
+    BACKLIGHT_PWM_TIM_FORCE_RESET();
+    BACKLIGHT_PWM_TIM_RELEASE_RESET();
+    BACKLIGHT_PWM_TIM_CLK_DIS();
+
   } else {  // action == BACKLIGHT_RETAIN
     BACKLIGHT_PWM_TIM->BACKLIGHT_PWM_TIM_CCR =
         (LED_PWM_TIM_PERIOD * drv->current_level) / 255;

core/embed/io/display/inc/io/display.h

@@ -59,7 +59,9 @@ typedef enum {
 //
 // If `mode` is `DISPLAY_RETAIN_CONTENT`, ensure the driver was previously
 // initialized and `display_deinit(DISPLAY_RETAIN_CONTENT)` was called.
-void display_init(display_content_mode_t mode);
+//
+// Returns `true` if the initialization was successful.
+bool display_init(display_content_mode_t mode);
 
 // Deinitializes the display controller.
 //