[nrf noup] boards: nordic: Turn off MRAM suspend for NRF54H20 DK

Turn off suspending MRAM for NRF54H20 DK
This change is required so sections of code
depending on critical timings will not have unacceptable latency.

Signed-off-by: Jan Zyczkowski <[email protected]>

boards/nordic/nrf54h20dk/CMakeLists.txt

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+if(CONFIG_NRFS_MRAM_SERVICE_ENABLED)
+  zephyr_library_sources(board.c)
+endif()

boards/nordic/nrf54h20dk/board.c

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/init.h>
+
+#define MODULE mram_suspend_off
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(MODULE);
+
+#include <services/nrfs_mram.h>
+#include <nrfs_backend_ipc_service.h>
+
+#define MRAM_SUSPEND_OFF_INIT_PRIO 90
+
+void mram_latency_handler(nrfs_mram_latency_evt_t const *p_evt, void *context)
+{
+	switch (p_evt->type) {
+	case NRFS_MRAM_LATENCY_REQ_APPLIED:
+		LOG_INF("MRAM latency handler: response received");
+		break;
+	case NRFS_MRAM_LATENCY_REQ_REJECTED:
+		LOG_ERR("MRAM latency handler - request rejected!");
+		break;
+	default:
+		LOG_ERR("MRAM latency handler - unexpected event: 0x%x", p_evt->type);
+		break;
+	}
+}
+
+static int turn_off_suspend_mram(void)
+{
+	/* Turn off mram automatic suspend as it causes delays in time depended code sections. */
+
+	nrfs_err_t err = NRFS_SUCCESS;
+
+	/* Wait for ipc initialization */
+	nrfs_backend_wait_for_connection(K_FOREVER);
+
+	err = nrfs_mram_init(mram_latency_handler);
+	if (err != NRFS_SUCCESS) {
+		LOG_ERR("MRAM service init failed: %d", err);
+	} else {
+		LOG_INF("MRAM service initialized");
+	}
+
+	LOG_INF("MRAM: set latency: NOT ALLOWED");
+	err = nrfs_mram_set_latency(MRAM_LATENCY_NOT_ALLOWED, NULL);
+	if (err) {
+		LOG_ERR("MRAM: set latency failed (%d)", err);
+	}
+
+	return err;
+}
+
+SYS_INIT(turn_off_suspend_mram, APPLICATION, MRAM_SUSPEND_OFF_INIT_PRIO);

modules/hal_nordic/nrfs/Kconfig

@@ -72,6 +72,7 @@ config NRFS_RESET_SERVICE_ENABLED
 config NRFS_MRAM_SERVICE_ENABLED
 	bool "MRAM latency service"
 	depends on NRFS_HAS_MRAM_SERVICE
+	default y
 
 config NRFS_TEMP_SERVICE_ENABLED
 	bool "Temperature service"