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rp2: Selectively leave the USB clocks enabled in light sleep. #15111

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merged 1 commit into from
Jun 3, 2024
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rp2: Selectively leave the USB clocks enabled in light sleep. #15111

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24 changes: 21 additions & 3 deletions ports/rp2/modmachine.c
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,7 @@
// extmod/modmachine.c via MICROPY_PY_MACHINE_INCLUDEFILE.

#include "py/mphal.h"
#include "mp_usbd.h"
#include "modmachine.h"
#include "uart.h"
#include "hardware/clocks.h"
Expand Down Expand Up @@ -134,8 +135,17 @@ static void mp_machine_lightsleep(size_t n_args, const mp_obj_t *args) {
return;
}
#endif
// Disable USB and ADC clocks.
clock_stop(clk_usb);

#if MICROPY_HW_ENABLE_USBDEV
// Only disable the USB clock if a USB host has not configured the device
bool disable_usb = !tud_mounted();
#else
bool disable_usb = true;
#endif
if (disable_usb) {
clock_stop(clk_usb);
}

clock_stop(clk_adc);

// CLK_REF = XOSC
Expand All @@ -152,7 +162,9 @@ static void mp_machine_lightsleep(size_t n_args, const mp_obj_t *args) {

// Disable PLLs.
pll_deinit(pll_sys);
pll_deinit(pll_usb);
if (disable_usb) {
pll_deinit(pll_usb);
}

// Disable ROSC.
rosc_hw->ctrl = ROSC_CTRL_ENABLE_VALUE_DISABLE << ROSC_CTRL_ENABLE_LSB;
Expand Down Expand Up @@ -181,6 +193,12 @@ static void mp_machine_lightsleep(size_t n_args, const mp_obj_t *args) {
// TODO: Use RTC alarm to wake.
clocks_hw->sleep_en1 = 0;
}

if (!disable_usb) {
clocks_hw->sleep_en0 |= CLOCKS_SLEEP_EN0_CLK_SYS_PLL_USB_BITS;
clocks_hw->sleep_en1 |= CLOCKS_SLEEP_EN1_CLK_USB_USBCTRL_BITS;
}

scb_hw->scr |= M0PLUS_SCR_SLEEPDEEP_BITS;
__wfi();
scb_hw->scr &= ~M0PLUS_SCR_SLEEPDEEP_BITS;
Expand Down
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