applications: nrf_desktop: Disable UDC DWC2 DMA on nRF54H20 DK

The DMA support is experimental, disabling the feature improves USB HID
stability. Since nRF Desktop uses only small HID reports (report size is
smaller than 64 bytes), the DMA doesn't improve performance.

Jira: NCSDK-29547

Signed-off-by: Marek Pieta <[email protected]>

Author: MarekPieta

applications/nrf_desktop/configuration/nrf54h20dk_nrf54h20_cpuapp/prj.conf

@@ -90,6 +90,10 @@ CONFIG_LED=y
 # PWM not supported on this target, using GPIO instead.
 CONFIG_LED_GPIO=y
 
+# The UDC DWC2 DMA support is experimental. Disable the feature to improve USB stability. Since nRF
+# Desktop uses only small HID reports (size < 64 bytes), the DMA doesn't improve performance.
+CONFIG_UDC_DWC2_DMA=n
+
 CONFIG_BT_MAX_PAIRED=2
 CONFIG_BT_ID_MAX=3
 

applications/nrf_desktop/configuration/nrf54h20dk_nrf54h20_cpuapp/prj_dongle.conf

@@ -75,6 +75,10 @@ CONFIG_LED=y
 # PWM not supported on this target, using GPIO instead.
 CONFIG_LED_GPIO=y
 
+# The UDC DWC2 DMA support is experimental. Disable the feature to improve USB stability. Since nRF
+# Desktop uses only small HID reports (size < 64 bytes), the DMA doesn't improve performance.
+CONFIG_UDC_DWC2_DMA=n
+
 CONFIG_BT_PRIVACY=y
 
 CONFIG_BT_BUF_ACL_TX_SIZE=35

applications/nrf_desktop/configuration/nrf54h20dk_nrf54h20_cpuapp/prj_release.conf

@@ -84,6 +84,10 @@ CONFIG_LED=y
 # PWM not supported on this target, using GPIO instead.
 CONFIG_LED_GPIO=y
 
+# The UDC DWC2 DMA support is experimental. Disable the feature to improve USB stability. Since nRF
+# Desktop uses only small HID reports (size < 64 bytes), the DMA doesn't improve performance.
+CONFIG_UDC_DWC2_DMA=n
+
 CONFIG_BT_MAX_PAIRED=2
 CONFIG_BT_ID_MAX=3
 

applications/nrf_desktop/configuration/nrf54h20dk_nrf54h20_cpuapp/prj_release_dongle.conf

@@ -74,6 +74,10 @@ CONFIG_LED=y
 # PWM not supported on this target, using GPIO instead.
 CONFIG_LED_GPIO=y
 
+# The UDC DWC2 DMA support is experimental. Disable the feature to improve USB stability. Since nRF
+# Desktop uses only small HID reports (size < 64 bytes), the DMA doesn't improve performance.
+CONFIG_UDC_DWC2_DMA=n
+
 CONFIG_BT_PRIVACY=y
 
 CONFIG_BT_BUF_ACL_TX_SIZE=35