wifi: mt76: mt7915: update mpdu density capability

Set mpdu density to 2 usec for non-mt7915 Wi-Fi 6 generation chipsets
to align to the hardware capability which improves the throughput.
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/init.c

@@ -390,8 +390,12 @@ mt7915_init_wiphy(struct mt7915_phy *phy)
 		phy->mt76->sband_2g.sband.ht_cap.cap |=
 			IEEE80211_HT_CAP_LDPC_CODING |
 			IEEE80211_HT_CAP_MAX_AMSDU;
-		phy->mt76->sband_2g.sband.ht_cap.ampdu_density =
-			IEEE80211_HT_MPDU_DENSITY_4;
+		if (is_mt7915(&dev->mt76))
+			phy->mt76->sband_2g.sband.ht_cap.ampdu_density =
+				IEEE80211_HT_MPDU_DENSITY_4;
+		else
+			phy->mt76->sband_2g.sband.ht_cap.ampdu_density =
+				IEEE80211_HT_MPDU_DENSITY_2;
 	}
 
 	if (phy->mt76->cap.has_5ghz) {
@@ -401,10 +405,11 @@ mt7915_init_wiphy(struct mt7915_phy *phy)
 		phy->mt76->sband_5g.sband.ht_cap.cap |=
 			IEEE80211_HT_CAP_LDPC_CODING |
 			IEEE80211_HT_CAP_MAX_AMSDU;
-		phy->mt76->sband_5g.sband.ht_cap.ampdu_density =
-			IEEE80211_HT_MPDU_DENSITY_4;
 
 		if (is_mt7915(&dev->mt76)) {
+			phy->mt76->sband_5g.sband.ht_cap.ampdu_density =
+				IEEE80211_HT_MPDU_DENSITY_4;
+
 			vht_cap->cap |=
 				IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_7991 |
 				IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;
@@ -414,6 +419,9 @@ mt7915_init_wiphy(struct mt7915_phy *phy)
 					IEEE80211_VHT_CAP_SHORT_GI_160 |
 					FIELD_PREP(IEEE80211_VHT_CAP_EXT_NSS_BW_MASK, 1);
 		} else {
+			phy->mt76->sband_5g.sband.ht_cap.ampdu_density =
+				IEEE80211_HT_MPDU_DENSITY_2;
+
 			vht_cap->cap |=
 				IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
 				IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK;