WDMA_RING_TX(0) is required to set MTK_WED_WDMA_RING_TX for WED RX but on a non-DBDC MT7986 it is never setup because idx is 1. Setting MTK_WED_WDMA_RING_TX with WDMA_RING_TX(1) is not feasible because WED still tries to send through WDMA_RING_TX(0). This is verified with register dump. Fix this by calling mtk_wed_wdma_tx_ring_setup if wed is v2 and rx_ring[0] is not allocated and reset tx_wdma[0] if it's already allocated. Fixes: 4c5de09eb0d0 ("net: ethernet: mtk_wed: add configure wed wo support") Signed-off-by: Zhi-Jun You --- Changes in v3: - no change - Link to v2: https://lore.kernel.org/r/20260711112128.971-1-hujy652@gmail.com Changes in v2: - Address warm reset concern raised by AI review. - Return value concern is skipped until further comment from reviewers. - Added a comment to explain this special case. - Link to v1: https://lore.kernel.org/r/20260630144831.1109-1-hujy652@gmail.com --- drivers/net/ethernet/mediatek/mtk_wed.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/ethernet/mediatek/mtk_wed.c b/drivers/net/ethernet/mediatek/mtk_wed.c index 7d2775a97fa0..b48abad995d7 100644 --- a/drivers/net/ethernet/mediatek/mtk_wed.c +++ b/drivers/net/ethernet/mediatek/mtk_wed.c @@ -2334,6 +2334,13 @@ mtk_wed_start(struct mtk_wed_device *dev, u32 irq_mask) if (!dev->rx_wdma[i].desc) mtk_wed_wdma_rx_ring_setup(dev, i, 16, false); + /* + * non-DBDC MT7986 allocates only rx_ring[1] and tx_wdma[1] during setup + * but tx_wdma[0] is also needed for WED to function. + */ + if (mtk_wed_is_v2(dev->hw) && !dev->rx_ring[0].desc) + mtk_wed_wdma_tx_ring_setup(dev, 0, MTK_WED_WDMA_RING_SIZE, !!dev->tx_wdma[0].desc); + if (dev->wlan.hw_rro) { for (i = 0; i < MTK_WED_RX_PAGE_QUEUES; i++) { u32 addr = MTK_WED_RRO_MSDU_PG_CTRL0(i) + -- 2.47.3