diff --git a/src/ap/ap_drv_ops.c b/src/ap/ap_drv_ops.c
index 2cc322308..b4123b812 100644
--- a/src/ap/ap_drv_ops.c
+++ b/src/ap/ap_drv_ops.c
@@ -721,6 +721,8 @@ int hostapd_drv_send_action(struct hostapd_data *hapd, unsigned int freq,
 
 int hostapd_start_dfs_cac(struct hostapd_data *hapd, int freq, int flags)
 {
+	struct hostapd_freq_params data;
+
 	if (!hapd->driver || !hapd->driver->start_dfs_cac)
 		return 0;
 
@@ -742,5 +744,11 @@ int hostapd_start_dfs_cac(struct hostapd_data *hapd, int freq, int flags)
 		return -1;
 	}
 
-	return hapd->driver->start_dfs_cac(hapd->drv_priv, freq);
+	if (hostapd_set_freq_params(&data, hapd->iconf->hw_mode, freq,
+				    hapd->iconf->channel,
+				    hapd->iconf->ieee80211n,
+				    0, 0, 0, 0, 0))
+		return -1;
+
+	return hapd->driver->start_dfs_cac(hapd->drv_priv, &data);
 }
diff --git a/src/drivers/driver.h b/src/drivers/driver.h
index ad62c477f..37e27ba51 100644
--- a/src/drivers/driver.h
+++ b/src/drivers/driver.h
@@ -2735,10 +2735,10 @@ struct wpa_driver_ops {
 	/**
 	 * start_dfs_cac - Listen for radar interference on the channel
 	 * @priv: Private driver interface data
-	 * @freq: Frequency (in MHz) of the channel
+	 * @freq: Channel parameters
 	 * Returns: 0 on success, -1 on failure
 	 */
-	int (*start_dfs_cac)(void *priv, int freq);
+	int (*start_dfs_cac)(void *priv, struct hostapd_freq_params *freq);
 
 	/**
 	 * stop_ap - Removes beacon from AP
diff --git a/src/drivers/driver_nl80211.c b/src/drivers/driver_nl80211.c
index df3df0997..8decec5a0 100644
--- a/src/drivers/driver_nl80211.c
+++ b/src/drivers/driver_nl80211.c
@@ -10330,14 +10330,18 @@ static int nl80211_set_p2p_powersave(void *priv, int legacy_ps, int opp_ps,
 }
 
 
-static int nl80211_start_radar_detection(void *priv, int freq)
+static int nl80211_start_radar_detection(void *priv,
+					 struct hostapd_freq_params *freq)
 {
 	struct i802_bss *bss = priv;
 	struct wpa_driver_nl80211_data *drv = bss->drv;
 	struct nl_msg *msg;
 	int ret;
 
-	wpa_printf(MSG_DEBUG, "nl80211: Start radar detection (CAC)");
+	wpa_printf(MSG_DEBUG, "nl80211: Start radar detection (CAC) %d MHz (ht_enabled=%d, vht_enabled=%d, bandwidth=%d MHz, cf1=%d MHz, cf2=%d MHz)",
+		   freq->freq, freq->ht_enabled, freq->vht_enabled,
+		   freq->bandwidth, freq->center_freq1, freq->center_freq2);
+
 	if (!(drv->capa.flags & WPA_DRIVER_FLAGS_RADAR)) {
 		wpa_printf(MSG_DEBUG, "nl80211: Driver does not support radar "
 			   "detection");
@@ -10350,10 +10354,53 @@ static int nl80211_start_radar_detection(void *priv, int freq)
 
 	nl80211_cmd(bss->drv, msg, 0, NL80211_CMD_RADAR_DETECT);
 	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, drv->ifindex);
-	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq);
+	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, freq->freq);
 
-	/* only HT20 is supported at this point */
-	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE, NL80211_CHAN_HT20);
+	if (freq->vht_enabled) {
+		switch (freq->bandwidth) {
+		case 20:
+			NLA_PUT_U32(msg, NL80211_ATTR_CHANNEL_WIDTH,
+				    NL80211_CHAN_WIDTH_20);
+			break;
+		case 40:
+			NLA_PUT_U32(msg, NL80211_ATTR_CHANNEL_WIDTH,
+				    NL80211_CHAN_WIDTH_40);
+			break;
+		case 80:
+			if (freq->center_freq2)
+				NLA_PUT_U32(msg, NL80211_ATTR_CHANNEL_WIDTH,
+					    NL80211_CHAN_WIDTH_80P80);
+			else
+				NLA_PUT_U32(msg, NL80211_ATTR_CHANNEL_WIDTH,
+					    NL80211_CHAN_WIDTH_80);
+			break;
+		case 160:
+			NLA_PUT_U32(msg, NL80211_ATTR_CHANNEL_WIDTH,
+				    NL80211_CHAN_WIDTH_160);
+			break;
+		default:
+			return -1;
+		}
+		NLA_PUT_U32(msg, NL80211_ATTR_CENTER_FREQ1, freq->center_freq1);
+		if (freq->center_freq2)
+			NLA_PUT_U32(msg, NL80211_ATTR_CENTER_FREQ2,
+				    freq->center_freq2);
+	} else if (freq->ht_enabled) {
+		switch (freq->sec_channel_offset) {
+		case -1:
+			NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE,
+				    NL80211_CHAN_HT40MINUS);
+			break;
+		case 1:
+			NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE,
+				    NL80211_CHAN_HT40PLUS);
+			break;
+		default:
+			NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_CHANNEL_TYPE,
+				    NL80211_CHAN_HT20);
+			break;
+		}
+	}
 
 	ret = send_and_recv_msgs(drv, msg, NULL, NULL);
 	if (ret == 0)