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net: mediatek: add next data pointer coherency protection 

The QDMA engine can fail to update the register pointing to the next TX
descriptor if this bit does not get set in the QDMA configuration register.
Not setting this bit can result in invalid values inside the TX rings
registers which will causes TX stalls.

Signed-off-by: John Crispin <john@phrozen.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Crispin 2016-06-10 13:28:02 +02:00 committed by David S. Miller
parent 94321a9fc9
commit 6675086d04
2 changed files with 2 additions and 1 deletions
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2
drivers/net/ethernet/mediatek/mtk_eth_soc.c
View File

@ -1282,7 +1282,7 @@ static int mtk_start_dma(struct mtk_eth *eth)
mtk_w32(eth,
MTK_TX_WB_DDONE | MTK_RX_DMA_EN | MTK_TX_DMA_EN |
MTK_RX_2B_OFFSET | MTK_DMA_SIZE_16DWORDS |
MTK_RX_BT_32DWORDS,
MTK_RX_BT_32DWORDS | MTK_NDP_CO_PRO,
MTK_QDMA_GLO_CFG);
return 0;

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

@ -91,6 +91,7 @@
#define MTK_QDMA_GLO_CFG 0x1A04
#define MTK_RX_2B_OFFSET BIT(31)
#define MTK_RX_BT_32DWORDS (3 << 11)
#define MTK_NDP_CO_PRO BIT(10)
#define MTK_TX_WB_DDONE BIT(6)
#define MTK_DMA_SIZE_16DWORDS (2 << 4)
#define MTK_RX_DMA_BUSY BIT(3)