fix(core): reintroduce touch controller initialization without power down/up in firmware, fix model R firmware initialization

core/.changelog.d/2130.changed

@@ -0,0 +1 @@
+Remove power-down power-up cycle from touch controller initialization in firmware

core/.changelog.d/2130.removed

@@ -1 +0,0 @@
-Don't initialize touch controller in firmware

core/embed/bootloader/main.c

@@ -250,8 +250,8 @@ int main(void) {
   random_delays_init();
   // display_init_seq();
 #if defined TREZOR_MODEL_T
-  touch_init();
   touch_power_on();
+  touch_init();
 #endif
 
 #if defined TREZOR_MODEL_R

core/embed/firmware/main.c

@@ -73,7 +73,7 @@ int main(void) {
 #endif
 
   // reinitialize HAL for Trezor One
-#if defined TREZOR_MODEL_1 || defined TREZOR_MODEL_R
+#if defined TREZOR_MODEL_1
   HAL_Init();
 #endif
 
@@ -85,9 +85,7 @@ int main(void) {
 
 #if !defined TREZOR_MODEL_1
   parse_boardloader_capabilities();
-#endif
 
-#if defined TREZOR_MODEL_T
 #if PRODUCTION
   check_and_replace_bootloader();
 #endif
@@ -98,7 +96,7 @@ int main(void) {
   // Init peripherals
   pendsv_init();
 
-#if defined TREZOR_MODEL_1 || defined TREZOR_MODEL_R
+#if defined TREZOR_MODEL_1
   display_init();
   button_init();
 #endif
@@ -110,15 +108,17 @@ int main(void) {
 #endif
 
 #if defined TREZOR_MODEL_T
+  touch_init();
   // display_init_seq();
   sdcard_init();
+  display_clear();
+#endif
 
+#if !defined TREZOR_MODEL_1
   // jump to unprivileged mode
   // http://infocenter.arm.com/help/topic/com.arm.doc.dui0552a/CHDBIBGJ.html
   __asm__ volatile("msr control, %0" ::"r"(0x1));
   __asm__ volatile("isb");
-
-  display_clear();
 #endif
 
 #ifdef USE_SECP256K1_ZKP

core/embed/trezorhal/touch.c

@@ -102,8 +102,6 @@ static void touch_active_pin_state(void) {
                    // 300ms, giving an extra 10ms
 }
 
-void touch_init(void) { touch_default_pin_state(); }
-
 void HAL_I2C_MspInit(I2C_HandleTypeDef *hi2c) {
   // enable I2C clock
   __HAL_RCC_I2C1_CLK_ENABLE();
@@ -200,18 +198,7 @@ static void _i2c_cycle(void) {
   HAL_Delay(10);
 }
 
-void touch_power_on(void) {
-  if (i2c_handle.Instance) {
-    return;
-  }
-
-  // turn on CTP circuitry
-  touch_active_pin_state();
-  HAL_Delay(50);
-
-  // I2C device interface configuration
-  _i2c_init();
-
+void touch_set_mode(void) {
   // set register 0xA4 G_MODE to interrupt polling mode (0x00). basically, CTPM
   // keeps this input line (to PC4) low while a finger is on the screen.
   uint8_t touch_panel_config[] = {0xA4, 0x00};
@@ -220,8 +207,18 @@ void touch_power_on(void) {
                                &i2c_handle, TOUCH_ADDRESS, touch_panel_config,
                                sizeof(touch_panel_config), 10)),
       NULL);
+}
 
-  touch_sensitivity(0x06);
+void touch_power_on(void) {
+  if (i2c_handle.Instance) {
+    return;
+  }
+
+  touch_default_pin_state();
+
+  // turn on CTP circuitry
+  touch_active_pin_state();
+  HAL_Delay(50);
 }
 
 void touch_power_off(void) {
@@ -231,6 +228,14 @@ void touch_power_off(void) {
   touch_default_pin_state();
 }
 
+void touch_init(void) {
+  // I2C device interface configuration
+  _i2c_init();
+
+  touch_set_mode();
+  touch_sensitivity(0x06);
+}
+
 void touch_sensitivity(uint8_t value) {
   // set panel threshold (TH_GROUP) - default value is 0x12
   uint8_t touch_panel_threshold[] = {0x80, value};