recipes-wifi/linux-mt76/files/patches/2003-wifi-mt76-mt7915-wed-find-rx-token-by-physical-addre.patch

From 457cb9380e3c1f875991bf551db68e638d4be95d Mon Sep 17 00:00:00 2001
From: Sujuan Chen <sujuan.chen@mediatek.com>
Date: Fri, 25 Nov 2022 14:32:35 +0800
Subject: [PATCH 2003/2009] wifi: mt76: mt7915: wed: find rx token by physical
 address

The token id in RxDMAD may be incorrect when it is not the last frame due to
WED HW bug. Lookup correct token id by physical address in sdp0.

Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
---
 dma.c | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

diff --git a/dma.c b/dma.c
index fc92e39..3047f8b 100644
--- a/dma.c
+++ b/dma.c
@@ -403,9 +403,32 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
 
 	if (mt76_queue_is_wed_rx(q)) {
 		u32 buf1 = le32_to_cpu(desc->buf1);
+		u32 id, find = 0;
 		u32 token = FIELD_GET(MT_DMA_CTL_TOKEN, buf1);
-		struct mt76_txwi_cache *t = mt76_rx_token_release(dev, token);
+		struct mt76_txwi_cache *t;
+
+		if (*more) {
+			spin_lock_bh(&dev->rx_token_lock);
+
+			idr_for_each_entry(&dev->rx_token, t, id) {
+				if (t->dma_addr == le32_to_cpu(desc->buf0)) {
+					find = 1;
+					token = id;
+
+					/* Write correct id back to DMA*/
+					u32p_replace_bits(&buf1, id,
+							  MT_DMA_CTL_TOKEN);
+					WRITE_ONCE(desc->buf1, cpu_to_le32(buf1));
+					break;
+				}
+			}
+
+			spin_unlock_bh(&dev->rx_token_lock);
+			if (!find)
+				return NULL;
+		}
 
+		t = mt76_rx_token_release(dev, token);
 		if (!t)
 			return NULL;
 
-- 
2.18.0