linux-kernel - [PATCH] Revert "wifi: ath12k: Enable REO queue lookup table feature on QCN9274 hw2.0"

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Message-ID: <20251208103152.236840-1-os@dev.tdt.de>
Date: Mon,  8 Dec 2025 11:31:52 +0100
From: Oliver Sedlbauer <os@....tdt.de>
To: stable@...r.kernel.org
Cc: quic_rajkbhag@...cinc.com, Oliver Sedlbauer <os@....tdt.de>,
	Kalle Valo <kvalo@...nel.org>, Jeff Johnson <jjohnson@...nel.org>,
	Sasha Levin <sashal@...nel.org>,
	Vasanthakumar Thiagarajan <vasanthakumar.thiagarajan@....qualcomm.com>,
	linux-wireless@...r.kernel.org, ath12k@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] Revert "wifi: ath12k: Enable REO queue lookup table feature on QCN9274 hw2.0"

This reverts commit 3b5e5185881edf4ee5a1af575e3aedac4a38a764.

The REO queue lookup table feature was enabled in 6.12.y due to an
upstream backport, but it causes severe RX performance degradation on
QCN9274 hw2.0 devices.

With this feature enabled, the vast majority of received packets are
dropped, reducing throughput drastically and making the device nearly
unusable.

Reverting this change restores full RX performance.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.5-01651-QCAHKSWPL_SILICONZ-1

Fixes: 3b5e5185881e ("wifi: ath12k: Enable REO queue lookup table feature on QCN9274 hw2.0")
Signed-off-by: Oliver Sedlbauer <os@....tdt.de>
---
Note:
This commit reverts a backport that was not a fix. The backported change
breaks previously working behavior on QCN9274 hw2.0 devices and should
not have been applied to the 6.12.y stable kernel.

 drivers/net/wireless/ath/ath12k/hw.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/ath12k/hw.c b/drivers/net/wireless/ath/ath12k/hw.c
index 057ef2d282b2..e3eb22bb9e1c 100644
--- a/drivers/net/wireless/ath/ath12k/hw.c
+++ b/drivers/net/wireless/ath/ath12k/hw.c
@@ -1084,7 +1084,7 @@ static const struct ath12k_hw_params ath12k_hw_params[] = {
 		.download_calib = true,
 		.supports_suspend = false,
 		.tcl_ring_retry = true,
-		.reoq_lut_support = true,
+		.reoq_lut_support = false,
 		.supports_shadow_regs = false,
 
 		.num_tcl_banks = 48,
-- 
2.39.5