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net: ethernet: mtk_wed: increase WED v2 WDMA RESV_BUFF to 0x80

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Change WDMA RESV_BUFF from 0x40 to 0x80 to avoid CDM TX FIFO overflow.
Without this patch mt7986 and mt7981 may have WDMA TX hang issue. This
patch was pulled from mtk-openwrt-feeds GPL open source project.

Link: 07c87502e8
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/OSZPR01MB779537889255E2F606E47EABBCA52@OSZPR01MB7795.jpnprd01.prod.outlook.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Shiji Yang 2026-08-19 21:07:07 +08:00 committed by Jakub Kicinski
parent 7cbfb18094
commit c0ef04232f
2 changed files with 6 additions and 0 deletions
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5
drivers/net/ethernet/mediatek/mtk_wed.c
View File

@ -2071,6 +2071,11 @@ mtk_wed_dma_enable(struct mtk_wed_device *dev)
wdma_set(dev, MTK_WDMA_GLO_CFG, MTK_WDMA_GLO_CFG_TX_DMA_EN);
}
if (mtk_wed_is_v2(dev->hw))
wdma_m32(dev, MTK_WDMA_GLO_CFG,
MTK_WDMA_GLO_CFG_RESV_BUFF,
FIELD_PREP(MTK_WDMA_GLO_CFG_RESV_BUFF, 0x80));
wed_set(dev, MTK_WED_GLO_CFG,
MTK_WED_GLO_CFG_TX_DMA_EN |
MTK_WED_GLO_CFG_RX_DMA_EN);

1
drivers/net/ethernet/mediatek/mtk_wed_regs.h
View File

@ -433,6 +433,7 @@ struct mtk_wdma_desc {
#define MTK_WDMA_GLO_CFG_TX_DMA_BUSY BIT(1)
#define MTK_WDMA_GLO_CFG_RX_DMA_EN BIT(2)
#define MTK_WDMA_GLO_CFG_RX_DMA_BUSY BIT(3)
#define MTK_WDMA_GLO_CFG_RESV_BUFF GENMASK(23, 16)
#define MTK_WDMA_GLO_CFG_RX_INFO3_PRERES BIT(26)
#define MTK_WDMA_GLO_CFG_RX_INFO2_PRERES BIT(27)
#define MTK_WDMA_GLO_CFG_RX_INFO1_PRERES BIT(28)