[nrf fromlist] modules: hal_nordic: nrf_802154: enable constant latency

To ensure that the accesses to the radio peripheral are done with predictable timings, the constant latency must be enabled. The constant latency mode is enabled alongside the HFXO. Upstream PR #: 85883 Signed-off-by: Rafał Kuźnia <[email protected]>
nrfconnect · Feb 25, 2025 · 0b58ccd · 0b58ccd
1 parent 65d9b7d
commit 0b58ccd
Show file tree

Hide file tree

Showing 2 changed files with 21 additions and 0 deletions.
diff --git a/modules/hal_nordic/Kconfig b/modules/hal_nordic/Kconfig
@@ -36,6 +36,13 @@ menuconfig NRF_802154_RADIO_DRIVER
 
 if NRF_802154_RADIO_DRIVER
 
+config NRF_802154_CONSTLAT_CONTROL
+	def_bool y
+	depends on SOC_SERIES_NRF54LX && NRF_802154_SL_OPENSOURCE
+	select NRF_SYS_EVENT
+	help
+	  Allows the nRF 802.15.4 radio driver to manage the constant latency state.
+
 config NRF_802154_MULTIPROTOCOL_SUPPORT
 	bool
 	help

diff --git a/modules/hal_nordic/nrf_802154/sl_opensource/platform/nrf_802154_clock_zephyr.c b/modules/hal_nordic/nrf_802154/sl_opensource/platform/nrf_802154_clock_zephyr.c
@@ -12,6 +12,7 @@
 #include <compiler_abstraction.h>
 #include <zephyr/kernel.h>
 #include <zephyr/drivers/clock_control/nrf_clock_control.h>
+#include <nrf_sys_event.h>
 
 static bool hfclk_is_running;
 
@@ -52,6 +53,14 @@ void nrf_802154_clock_hfclk_start(void)
 
 	sys_notify_init_callback(&hfclk_cli.notify, hfclk_on_callback);
 
+	/*
+	 * todo: replace constlat request with PM policy API when
+	 * controlling the event latency becomes possible.
+	 */
+	if (IS_ENABLED(CONFIG_NRF_802154_CONSTLAT_CONTROL)) {
+		nrf_sys_event_request_global_constlat();
+	}
+
 	int ret = onoff_request(mgr, &hfclk_cli);
 	__ASSERT_NO_MSG(ret >= 0);
 	(void)ret;
@@ -67,6 +76,11 @@ void nrf_802154_clock_hfclk_stop(void)
 	int ret = onoff_cancel_or_release(mgr, &hfclk_cli);
 	__ASSERT_NO_MSG(ret >= 0);
 	(void)ret;
+
+	if (IS_ENABLED(CONFIG_NRF_802154_CONSTLAT_CONTROL)) {
+		nrf_sys_event_release_global_constlat();
+	}
+
 	hfclk_is_running = false;
 }