[PATCH net v6 1/4] net: ethernet: mtk_wed: skip ring reset in wdma_tx_ring_setup for WED v3

[Zhi-Jun You]

Currently WED v3 tx wdma ring, ring reset happens in a separate code
block unconditionally.

Moreover, v3 has double the size of wdma_desc and has different init
values. mtk_wed_ring_reset doens't deal with that and would corrupt the
wdma_desc.

Fix this by skipping mtk_wed_ring_reset in mtk_wdma_tx_ring_setup for
WED v3.

Fixes: e2f64db13aa1 ("net: ethernet: mtk_wed: introduce WED support for MT7988")
Reported-by: Sashiko <sashiko-bot at kernel.org>
Link: https://sashiko.dev/#/patchset/20260711112128.971-1-hujy652@gmail.com?part=1
Signed-off-by: Zhi-Jun You <hujy652 at gmail.com>
---
 drivers/net/ethernet/mediatek/mtk_wed.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c
index 53d3b7e00e1c..d55042ccaff1 100644
--- a/drivers/net/ethernet/mediatek/mtk_wed.c
+++ b/drivers/net/ethernet/mediatek/mtk_wed.c
@@ -1938,7 +1938,7 @@ mtk_wed_wdma_tx_ring_setup(struct mtk_wed_device *dev, int idx, int size,
 	wdma_w32(dev, MTK_WDMA_RING_TX(idx) + MTK_WED_RING_OFS_CPU_IDX, 0);
 	wdma_w32(dev, MTK_WDMA_RING_TX(idx) + MTK_WED_RING_OFS_DMA_IDX, 0);
 
-	if (reset)
+	if (!mtk_wed_is_v3_or_greater(dev->hw) && reset)
 		mtk_wed_ring_reset(wdma, MTK_WED_WDMA_RING_SIZE, true);
 
 	if (!idx)  {

-- 
2.55.0