add an option to turn off QSPI when sleep

ports/nrf/boards/makerdiary_m60_keyboard/mpconfigboard.h

@@ -30,9 +30,10 @@
 #define MICROPY_HW_BOARD_NAME       "Makerdiary M60 Keyboard"
 #define MICROPY_HW_MCU_NAME         "nRF52840"
 
-#define CP_RGB_STATUS_R             (&pin_P0_30)
-#define CP_RGB_STATUS_G             (&pin_P0_29)
-#define CP_RGB_STATUS_B             (&pin_P0_31)
+// RGB LEDs use PWM peripheral, avoid using them to save energy
+// #define CP_RGB_STATUS_R             (&pin_P0_30)
+// #define CP_RGB_STATUS_G             (&pin_P0_29)
+// #define CP_RGB_STATUS_B             (&pin_P0_31)
 
 #define MICROPY_QSPI_DATA0                NRF_GPIO_PIN_MAP(1, 10)
 #define MICROPY_QSPI_DATA1                NRF_GPIO_PIN_MAP(1, 14)

ports/nrf/supervisor/port.c

@@ -65,6 +65,10 @@
 #include "common-hal/audiopwmio/PWMAudioOut.h"
 #endif
 
+#if defined(MICROPY_QSPI_CS)
+extern void qspi_disable(void);
+#endif
+
 static void power_warning_handler(void) {
     reset_into_safe_mode(BROWNOUT);
 }
@@ -295,6 +299,10 @@ void port_interrupt_after_ticks(uint32_t ticks) {
 }
 
 void port_sleep_until_interrupt(void) {
+#if defined(MICROPY_QSPI_CS)
+    qspi_disable();
+#endif
+
     // Clear the FPU interrupt because it can prevent us from sleeping.
     if (NVIC_GetPendingIRQ(FPU_IRQn)) {
         __set_FPSCR(__get_FPSCR()  & ~(0x9f));

ports/nrf/supervisor/qspi_flash.c

@@ -38,7 +38,44 @@
 #include "supervisor/shared/external_flash/common_commands.h"
 #include "supervisor/shared/external_flash/qspi_flash.h"
 
+// When USB is disconnected, disable QSPI in sleep mode to save energy
+void qspi_disable(void)
+{
+    // If VBUS is detected, no need to disable QSPI
+    if (NRF_QSPI->ENABLE && !(NRF_POWER->USBREGSTATUS & POWER_USBREGSTATUS_VBUSDETECT_Msk)) {
+        // Keep CS high when QSPI is diabled
+        nrf_gpio_cfg_output(MICROPY_QSPI_CS);
+        nrf_gpio_pin_write(MICROPY_QSPI_CS, 1);
+
+        // Workaround to disable QSPI according to nRF52840 Revision 1 Errata V1.4 - 3.8
+        NRF_QSPI->TASKS_DEACTIVATE = 1;
+        *(volatile uint32_t *)0x40029054 = 1;
+        NRF_QSPI->ENABLE = 0;
+    }
+}
+
+void qspi_enable(void)
+{
+    if (NRF_QSPI->ENABLE) {
+        return;
+    }
+
+    nrf_qspi_enable(NRF_QSPI);
+
+    nrf_qspi_event_clear(NRF_QSPI, NRF_QSPI_EVENT_READY);
+    nrf_qspi_task_trigger(NRF_QSPI, NRF_QSPI_TASK_ACTIVATE);
+
+    uint32_t remaining_attempts = 100;
+    do {
+        if (nrf_qspi_event_check(NRF_QSPI, NRF_QSPI_EVENT_READY)) {
+            break;
+        }
+        NRFX_DELAY_US(10);
+    } while (--remaining_attempts);
+}
+
 bool spi_flash_command(uint8_t command) {
+    qspi_enable();
     nrf_qspi_cinstr_conf_t cinstr_cfg = {
         .opcode = command,
         .length = 1,
@@ -51,6 +88,7 @@ bool spi_flash_command(uint8_t command) {
 }
 
 bool spi_flash_read_command(uint8_t command, uint8_t* response, uint32_t length) {
+    qspi_enable();
     nrf_qspi_cinstr_conf_t cinstr_cfg = {
         .opcode = command,
         .length = length + 1,
@@ -64,6 +102,7 @@ bool spi_flash_read_command(uint8_t command, uint8_t* response, uint32_t length)
 }
 
 bool spi_flash_write_command(uint8_t command, uint8_t* data, uint32_t length) {
+    qspi_enable();
     nrf_qspi_cinstr_conf_t cinstr_cfg = {
         .opcode = command,
         .length = length + 1,
@@ -76,20 +115,23 @@ bool spi_flash_write_command(uint8_t command, uint8_t* data, uint32_t length) {
 }
 
 bool spi_flash_sector_command(uint8_t command, uint32_t address) {
+    qspi_enable();
     if (command != CMD_SECTOR_ERASE) {
         return false;
     }
     return nrfx_qspi_erase(NRF_QSPI_ERASE_LEN_4KB, address) == NRFX_SUCCESS;
 }
 
 bool spi_flash_write_data(uint32_t address, uint8_t* data, uint32_t length) {
+    qspi_enable();
     // TODO: In theory, this also needs to handle unaligned data and
     // non-multiple-of-4 length.  (in practice, I don't think the fat layer
     // generates such writes)
     return nrfx_qspi_write(data, length, address) == NRFX_SUCCESS;
 }
 
 bool spi_flash_read_data(uint32_t address, uint8_t* data, uint32_t length) {
+    qspi_enable();
     int misaligned = ((intptr_t)data) & 3;
     // If the data is misaligned, we need to read 4 bytes
     // into an aligned buffer, and then copy 1, 2, or 3 bytes from the aligned