qtnfmac: add support for scan dwell time configuration

Firmware supports scan dwell time tuning for various types of scans.
Enable support for this feature:
- advertise capability to configure channel dwell time to host
- pass scan dwell parameters to wireless card in scan request
Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@quantenna.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/quantenna/qtnfmac/cfg80211.c

@@ -1101,6 +1101,10 @@ int qtnf_wiphy_register(struct qtnf_hw_info *hw_info, struct qtnf_wmac *mac)
 	if (hw_info->hw_capab & QLINK_HW_CAPAB_DFS_OFFLOAD)
 		wiphy_ext_feature_set(wiphy, NL80211_EXT_FEATURE_DFS_OFFLOAD);
 
+	if (hw_info->hw_capab & QLINK_HW_CAPAB_SCAN_DWELL)
+		wiphy_ext_feature_set(wiphy,
+				      NL80211_EXT_FEATURE_SET_SCAN_DWELL);
+
 	wiphy->probe_resp_offload = NL80211_PROBE_RESP_OFFLOAD_SUPPORT_WPS |
 				    NL80211_PROBE_RESP_OFFLOAD_SUPPORT_WPS2;
 

drivers/net/wireless/quantenna/qtnfmac/commands.c

@@ -2203,6 +2203,15 @@ int qtnf_cmd_send_scan(struct qtnf_wmac *mac)
 		qtnf_cmd_skb_put_tlv_tag(cmd_skb, QTN_TLV_ID_SCAN_FLUSH);
 	}
 
+	if (scan_req->duration) {
+		pr_debug("MAC%u: %s scan duration %u\n", mac->macid,
+			 scan_req->duration_mandatory ? "mandatory" : "max",
+			 scan_req->duration);
+
+		qtnf_cmd_skb_put_tlv_u16(cmd_skb, QTN_TLV_ID_SCAN_DWELL,
+					 scan_req->duration);
+	}
+
 	ret = qtnf_cmd_send(mac->bus, cmd_skb);
 	if (ret)
 		goto out;

drivers/net/wireless/quantenna/qtnfmac/qlink.h

@@ -80,6 +80,7 @@ enum qlink_hw_capab {
 	QLINK_HW_CAPAB_SCAN_RANDOM_MAC_ADDR	= BIT(3),
 	QLINK_HW_CAPAB_PWR_MGMT			= BIT(4),
 	QLINK_HW_CAPAB_OBSS_SCAN		= BIT(5),
+	QLINK_HW_CAPAB_SCAN_DWELL		= BIT(6),
 };
 
 enum qlink_iface_type {
@@ -1152,6 +1153,7 @@ enum qlink_tlv_id {
 	QTN_TLV_ID_WOWLAN_CAPAB		= 0x0410,
 	QTN_TLV_ID_WOWLAN_PATTERN	= 0x0411,
 	QTN_TLV_ID_SCAN_FLUSH		= 0x0412,
+	QTN_TLV_ID_SCAN_DWELL		= 0x0413,
 };
 
 struct qlink_tlv_hdr {