From a1d6921a833c7d85170cb54145bfcf98d7f11283 Mon Sep 17 00:00:00 2001
From: Shayne Chen <shayne.chen@mediatek.com>
Date: Tue, 29 Mar 2022 16:06:30 +0800
Subject: [PATCH] cfg80211: mtk: extend CAC time for weather radar channels

Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
---
 include/net/cfg80211.h | 1 +
 net/wireless/chan.c    | 7 +++++++
 net/wireless/nl80211.c | 3 +++
 3 files changed, 11 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 98a2971..28c0a5f 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -149,6 +149,7 @@ enum ieee80211_channel_flags {
 	(IEEE80211_CHAN_NO_HT40PLUS | IEEE80211_CHAN_NO_HT40MINUS)
 
 #define IEEE80211_DFS_MIN_CAC_TIME_MS		60000
+#define IEEE80211_DFS_WEATHER_MIN_CAC_TIME_MS	600000
 #define IEEE80211_DFS_MIN_NOP_TIME_MS		(30 * 60 * 1000)
 
 /**
diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index d5ed976..62f0169 100644
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -931,6 +931,13 @@ static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy,
 		if (!(c->flags & IEEE80211_CHAN_RADAR))
 			continue;
 
+		/* weather radar in ETSI */
+		if (reg_get_dfs_region(wiphy) == NL80211_DFS_ETSI &&
+		    freq >= MHZ_TO_KHZ(5600) && freq <= MHZ_TO_KHZ(5640) &&
+		    dfs_cac_ms < IEEE80211_DFS_WEATHER_MIN_CAC_TIME_MS &&
+		    c->dfs_state == NL80211_DFS_USABLE)
+			dfs_cac_ms = IEEE80211_DFS_WEATHER_MIN_CAC_TIME_MS;
+
 		if (c->dfs_cac_ms > dfs_cac_ms)
 			dfs_cac_ms = c->dfs_cac_ms;
 	}
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f3b2fc4..215a603 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -9817,6 +9817,9 @@ static int nl80211_start_radar_detection(struct sk_buff *skb,
 	if (WARN_ON(!cac_time_ms))
 		cac_time_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
 
+	pr_info("%s: region = %u, center freq1 = %u, center freq2 = %u, cac time ms = %u\n",
+		__func__, dfs_region, chandef.center_freq1, chandef.center_freq2, cac_time_ms);
+
 	err = rdev_start_radar_detection(rdev, dev, &chandef, cac_time_ms);
 	if (!err) {
 		wdev->links[0].ap.chandef = chandef;
-- 
2.18.0