[PATCH 2/4] wifi: rtw89: advertise Multi-RU OFDMA receive for 8922a per WFA cert

[Louis Kotze]

Wi-Fi Alliance Certificate WFA129313 (RTL8922AE, 2024-05-23, firmware
6102.24.109.0) attests "Multi-RU" as a certified Wi-Fi 7 feature for
this chip. The driver currently hard-zeroes the corresponding receive
cap bit in rtw89_init_eht_cap(), which prevents the AP from scheduling
Multi-RU OFDMA TBF (Trigger-Based Frame) payloads with sub-242-tone RU
allocations to this STA.

Set IEEE80211_EHT_PHY_CAP5_RX_LESS_242_TONE_RU_SUPP in phy_cap_info[5]
to match the certified silicon behaviour. The Tx-side bit
(CAP5_TX_LESS_242_TONE_RU_SUPP) remains zero since this driver is
STA-mode only and Tx of Multi-RU TBFs is an AP-mode capability.

Tested on RTL8922AU (USB variant, same MAC + RF as cert'd PCIe AE)
against TP-Link Deco BE63 mesh; STA associates and remains stable for
24h+ with no regression in single-RU traffic patterns or in EMLSR
multi-link assoc behavior introduced by the previous EML+R-TWT patch.

Link: https://api.cert.wi-fi.org/api/certificate/download/public?variantId=129706 [WFA cert WFA129313]
Signed-off-by: Louis Kotze <loukot@xxxxxxxxx>
---
 drivers/net/wireless/realtek/rtw89/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtw89/core.c b/drivers/net/wireless/realtek/rtw89/core.c
index 056639db1dfa..986deb2c1384 100644
--- a/drivers/net/wireless/realtek/rtw89/core.c
+++ b/drivers/net/wireless/realtek/rtw89/core.c
@@ -5598,7 +5598,8 @@ static void rtw89_init_eht_cap(struct rtw89_dev *rtwdev,
 
 	eht_cap_elem->phy_cap_info[5] =
 		u8_encode_bits(IEEE80211_EHT_PHY_CAP5_COMMON_NOMINAL_PKT_PAD_20US,
-			       IEEE80211_EHT_PHY_CAP5_COMMON_NOMINAL_PKT_PAD_MASK);
+			       IEEE80211_EHT_PHY_CAP5_COMMON_NOMINAL_PKT_PAD_MASK) |
+		IEEE80211_EHT_PHY_CAP5_RX_LESS_242_TONE_RU_SUPP;
 
 	eht_cap_elem->phy_cap_info[6] = 0;
 	eht_cap_elem->phy_cap_info[7] = 0;
-- 
2.54.0