From 2ea36366ea036e3063ff553a2939c9cac17c6ac8 Mon Sep 17 00:00:00 2001
From: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
Date: Tue, 8 Aug 2023 19:21:41 +0800
Subject: [PATCH] hostapd: mtk: add back ht vht cap missing field before dfs
 channel fallback

hostapd_event_ch_switch would set / clear ht_capab and vht_capab, based
on the bandwidth of switched channel.
For example, vht bw 160 support field would be cleared if we switch to
non bw 160 channel.
This design works fine with NON-DFS channel switch.
However, for those DFS channels who require CAC, channel switch command
calls hostapd_switch_channel_fallback instead of hostapd_switch_channel.
This is simply restarting the interface not CHANNEL SWITCHING, so
hostapd will not receive any ch_switch event from kernel.
Therefore, the cleared field in vht_capab will not be set back to 1,
even if we channel switch to dfs channel bw 160.

Signed-off-by: StanleyYP Wang <StanleyYP.Wang@mediatek.com>
---
 src/ap/hostapd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/ap/hostapd.c b/src/ap/hostapd.c
index c2e0b13..4b7ebc5 100644
--- a/src/ap/hostapd.c
+++ b/src/ap/hostapd.c
@@ -4161,6 +4161,13 @@ hostapd_switch_channel_fallback(struct hostapd_iface *iface,
 		break;
 	}
 
+	if ((iface->current_mode->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET) &&
+	    freq_params->bandwidth > 20)
+		iface->conf->ht_capab |= HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET;
+	if ((iface->current_mode->vht_capab & VHT_CAP_SUPP_CHAN_WIDTH_160MHZ) &&
+	    freq_params->bandwidth == 160)
+		iface->conf->vht_capab |= VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
+
 	iface->freq = freq_params->freq;
 	iface->conf->channel = freq_params->channel;
 	iface->conf->secondary_channel = freq_params->sec_channel_offset;
-- 
2.18.0