applications: nrf_desktop: Use high GD frequency on nRF54H20

In nRF Desktop application, the DVFS module running on the application
core selects clock control and enables automatic low GD frequency
request. Update IPC radio configuration to ensure high GD frequency,
which is required to ensure stability of the Bluetooth stack with
SoftDevice Link Layer.

Jira: NCSDK-31824

Signed-off-by: Marek Pieta <Marek.Pieta@nordicsemi.no>
Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>

applications/nrf_desktop/configuration/nrf54h20dk_nrf54h20_cpurad/images/ipc_radio/prj.conf

@@ -44,6 +44,9 @@ CONFIG_SPEED_OPTIMIZATIONS=y
 CONFIG_LTO=y
 CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
 
+# Bluetooth stack with SoftDevice Link Layer requires high frequency in GD to make L2 cache and MRAM run fast to avoid code execution delays.
+CONFIG_CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_REQ_LOW_FREQ=n
+
 ################################################################################
 # Debug logs
 

applications/nrf_desktop/configuration/nrf54h20dk_nrf54h20_cpurad/images/ipc_radio/prj_release.conf

@@ -41,6 +41,9 @@ CONFIG_SPEED_OPTIMIZATIONS=y
 CONFIG_LTO=y
 CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
 
+# Bluetooth stack with SoftDevice Link Layer requires high frequency in GD to make L2 cache and MRAM run fast to avoid code execution delays.
+CONFIG_CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_REQ_LOW_FREQ=n
+
 ################################################################################
 # Disable unused features
 

doc/nrf/releases_and_maturity/releases/release-notes-changelog.rst

@@ -246,6 +246,10 @@ nRF Desktop
     * Disabled Bluetooth long workqueue (:kconfig:option:`CONFIG_BT_LONG_WQ`).
     * Limited the number of key slots in the PSA Crypto core to 10 (:kconfig:option:`CONFIG_MBEDTLS_PSA_KEY_SLOT_COUNT`).
 
+  * Disabled :kconfig:option:`CONFIG_CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_REQ_LOW_FREQ` in the IPC radio image configuration for nRF54H20 SoC.
+    The :ref:`nrf_desktop_dvfs` running on the application core selects clock control and enables automatic low GD frequency request (:kconig:option:`CONFIG_CLOCK_CONTROL_NRF2_GLOBAL_HSFLL_REQ_LOW_FREQ`).
+    Bluetooth stack with SoftDevice Link Layer requires high frequency in GD to make L2 cache and MRAM run fast to avoid code execution delays.
+
 * Added:
 
   * System Power Management for the :ref:`zephyr:nrf54h20dk_nrf54h20` board target on the application and radio cores.