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

From 79d00e5e7ff7653dc6839551f33a5b36d6291169 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 2003/2014] 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 100d2af..185c6f1 100644
--- a/dma.c
+++ b/dma.c
@@ -444,9 +444,32 @@ mt76_dma_get_buf(struct mt76_dev *dev, struct mt76_queue *q, int idx,
 	mt76_dma_should_drop_buf(drop, ctrl, buf1, desc_info);
 
 	if (mt76_queue_is_wed_rx(q)) {
+		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