drivers: wifi: Option for Qos NULL frame based power save

[SHEL-2947] Provides an option to use Qos null frame based power save.
When set, RPU uses QoS null frames to retrieve buffered frames from the AP,
otherwise, it initially uses PS-POLL frames.

Signed-off-by: Ajay Parida <[email protected]>

drivers/wifi/nrf700x/Kconfig

@@ -403,3 +403,9 @@ config NRF_WIFI_AP_DEAD_DETECT_TIMEOUT
 	help
 		The number of seconds after which AP is declared dead if no beacons
 		are received from the AP. Used to detect AP silently going down e.g., power off.
+
+config NRF_WIFI_PS_DATA_RETRIEVAL_MODE
+	bool "Use only QoS null frame to retrieve buffered data from AP."
+	help
+	    By default RPU uses both QoS null frame and PS-Poll to retrieve buffered frames from the AP.
+	    Enable it to use only QoS null frames for retrieving buffered frames from the AP.

drivers/wifi/nrf700x/osal/fw_if/umac_if/src/cmd.c

@@ -193,6 +193,8 @@ enum nrf_wifi_status umac_cmd_init(struct nrf_wifi_fmac_dev_ctx *fmac_dev_ctx,
 		umac_cmd_data->disable_beamforming = 1;
 	}
 
+	umac_cmd_data->nullframe_pwrsave = IS_ENABLED(CONFIG_NRF_WIFI_PS_DATA_RETRIEVAL_MODE);
+
 	 status = nrf_wifi_hal_ctrl_cmd_send(fmac_dev_ctx->hal_dev_ctx,
 					    umac_cmd,
 					    (sizeof(*umac_cmd) + len));