mt76: mt7915: introduce mt7915_set_radar_background routine

Introduce mt7915_mcu_rdd_background_enable and
mt7915_mcu_background_chain_ctrl routines to configure rx dfs dedicated chain.
This is a preliminary patch to add zero-wait dfs support performing CAC
detection on rdd2.

Tested-by: Owen Peng <owen.peng@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 93 insertions, 0 deletions

diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
index 66f8daf3168c..dddefeebc7dd 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7915/mcu.c
@@ -2629,6 +2629,99 @@ int mt7915_mcu_set_radar_th(struct mt7915_dev *dev, int index,
 				 sizeof(req), true);
 }
 
+static int
+mt7915_mcu_background_chain_ctrl(struct mt7915_phy *phy,
+				 struct cfg80211_chan_def *chandef,
+				 int cmd)
+{
+	struct mt7915_dev *dev = phy->dev;
+	struct mt76_phy *mphy = phy->mt76;
+	struct ieee80211_channel *chan = mphy->chandef.chan;
+	int freq = mphy->chandef.center_freq1;
+	struct mt7915_mcu_background_chain_ctrl req = {
+		.monitor_scan_type = 2, /* simple rx */
+	};
+
+	if (!chandef && cmd != CH_SWITCH_BACKGROUND_SCAN_STOP)
+		return -EINVAL;
+
+	if (!cfg80211_chandef_valid(&mphy->chandef))
+		return -EINVAL;
+
+	switch (cmd) {
+	case CH_SWITCH_BACKGROUND_SCAN_START: {
+		req.chan = chan->hw_value;
+		req.central_chan = ieee80211_frequency_to_channel(freq);
+		req.bw = mt76_connac_chan_bw(&mphy->chandef);
+		req.monitor_chan = chandef->chan->hw_value;
+		req.monitor_central_chan =
+			ieee80211_frequency_to_channel(chandef->center_freq1);
+		req.monitor_bw = mt76_connac_chan_bw(chandef);
+		req.band_idx = phy != &dev->phy;
+		req.scan_mode = 1;
+		break;
+	}
+	case CH_SWITCH_BACKGROUND_SCAN_RUNNING:
+		req.monitor_chan = chandef->chan->hw_value;
+		req.monitor_central_chan =
+			ieee80211_frequency_to_channel(chandef->center_freq1);
+		req.band_idx = phy != &dev->phy;
+		req.scan_mode = 2;
+		break;
+	case CH_SWITCH_BACKGROUND_SCAN_STOP:
+		req.chan = chan->hw_value;
+		req.central_chan = ieee80211_frequency_to_channel(freq);
+		req.bw = mt76_connac_chan_bw(&mphy->chandef);
+		req.tx_stream = hweight8(mphy->antenna_mask);
+		req.rx_stream = mphy->antenna_mask;
+		break;
+	default:
+		return -EINVAL;
+	}
+	req.band = chandef ? chandef->chan->band == NL80211_BAND_5GHZ : 1;
+
+	return mt76_mcu_send_msg(&dev->mt76, MCU_EXT_CMD(OFFCH_SCAN_CTRL),
+				 &req, sizeof(req), false);
+}
+
+int mt7915_mcu_rdd_background_enable(struct mt7915_phy *phy,
+				     struct cfg80211_chan_def *chandef)
+{
+	struct mt7915_dev *dev = phy->dev;
+	int err, region;
+
+	if (!chandef) { /* disable offchain */
+		err = mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_STOP, MT_RX_SEL2,
+					      0, 0);
+		if (err)
+			return err;
+
+		return mt7915_mcu_background_chain_ctrl(phy, NULL,
+				CH_SWITCH_BACKGROUND_SCAN_STOP);
+	}
+
+	err = mt7915_mcu_background_chain_ctrl(phy, chandef,
+					       CH_SWITCH_BACKGROUND_SCAN_START);
+	if (err)
+		return err;
+
+	switch (dev->mt76.region) {
+	case NL80211_DFS_ETSI:
+		region = 0;
+		break;
+	case NL80211_DFS_JP:
+		region = 2;
+		break;
+	case NL80211_DFS_FCC:
+	default:
+		region = 1;
+		break;
+	}
+
+	return mt76_connac_mcu_rdd_cmd(&dev->mt76, RDD_START, MT_RX_SEL2,
+				       0, region);
+}
+
 int mt7915_mcu_set_chan_info(struct mt7915_phy *phy, int cmd)
 {
 	struct mt7915_dev *dev = phy->dev;