linux-kernel - [PATCH ath-next 9/9] wifi: ath12k: support 2 channels for single pdev device

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Message-ID: <20250402-ath12k-wcn7850-mlo-support-v1-9-bad47cf00704@quicinc.com>
Date: Wed, 2 Apr 2025 10:45:48 +0800
From: Baochen Qiang <quic_bqiang@...cinc.com>
To: Johannes Berg <johannes@...solutions.net>,
        Jeff Johnson
	<jjohnson@...nel.org>
CC: <linux-wireless@...r.kernel.org>, <ath12k@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Baochen Qiang <quic_bqiang@...cinc.com>
Subject: [PATCH ath-next 9/9] wifi: ath12k: support 2 channels for single
 pdev device

For single pdev device, radio number of a device is forced as 1 in
ath12k_wmi_ext_soc_hal_reg_caps_parse(). This leads to ah->num_radio == 1
and then in ath12k_mac_setup_iface_combinations() we report to
mac/cfg80211 that only 1 channel is supported. In MLO case, it finally
results in failing to bring up the second link as it is in another
channel.

Change num_different_channels to 2 to allow a second link. Since DFS on
multiple channels are not supported yet, remove radar_detect_widths.

For now WCN7850 is the only single pdev device, so others should not be
affected.

Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
Tested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00284-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1
Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00209-QCAHKSWPL_SILICONZ-1

Signed-off-by: Baochen Qiang <quic_bqiang@...cinc.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index d1695432168bb3db054f0c65797a2d32413034ad..353f6341e1b96e533bdae5fa5697949b72f00921 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -10915,13 +10915,18 @@ ath12k_mac_setup_radio_iface_comb(struct ath12k *ar,
 	comb[0].limits = limits;
 	comb[0].n_limits = n_limits;
 	comb[0].max_interfaces = max_interfaces;
-	comb[0].num_different_channels = 1;
 	comb[0].beacon_int_infra_match = true;
 	comb[0].beacon_int_min_gcd = 100;
-	comb[0].radar_detect_widths = BIT(NL80211_CHAN_WIDTH_20_NOHT) |
-					BIT(NL80211_CHAN_WIDTH_20) |
-					BIT(NL80211_CHAN_WIDTH_40) |
-					BIT(NL80211_CHAN_WIDTH_80);
+
+	if (ar->ab->hw_params->single_pdev_only) {
+		comb[0].num_different_channels = 2;
+	} else {
+		comb[0].num_different_channels = 1;
+		comb[0].radar_detect_widths = BIT(NL80211_CHAN_WIDTH_20_NOHT) |
+						BIT(NL80211_CHAN_WIDTH_20) |
+						BIT(NL80211_CHAN_WIDTH_40) |
+						BIT(NL80211_CHAN_WIDTH_80);
+	}
 
 	return 0;
 }

-- 
2.25.1