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drivers: uart: Enable rx byte counting timer only in active power state

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Nrfx_uarte uses a hardware timer/counter to count received bytes.
Keeping this timer enabled increases power consumption for some SoCs.

This change disables the timer when an inactive power state is set.

Signed-off-by: Audun Korneliussen <audun.korneliussen@nordicsemi.no>
This commit is contained in:
Audun Korneliussen 2020-01-14 15:34:34 +01:00 • committed by Ioannis Glaropoulos
commit a68ef65bc4
1 changed files with 6 additions and 0 deletions
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6
drivers/serial/uart_nrfx_uarte.c
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@ -1266,6 +1266,9 @@ static void uarte_nrfx_set_power_state(struct device *dev, u32_t new_state)
uarte_nrfx_pins_enable(dev, true);
nrf_uarte_enable(uarte);
#ifdef CONFIG_UART_ASYNC_API
if (hw_rx_counting_enabled(get_dev_data(dev))) {
nrfx_timer_enable(&get_dev_config(dev)->timer);
}
if (get_dev_data(dev)->async) {
return;
}
@ -1287,6 +1290,9 @@ static void uarte_nrfx_set_power_state(struct device *dev, u32_t new_state)
* only sent after each RX if async UART API is used.
*/
#ifdef CONFIG_UART_ASYNC_API
if (hw_rx_counting_enabled(get_dev_data(dev))) {
nrfx_timer_disable(&get_dev_config(dev)->timer);
}
if (get_dev_data(dev)->async) {
nrf_uarte_disable(uarte);
uarte_nrfx_pins_enable(dev, false);