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From: MarkLee <Mark-MC.Lee@mediatek.com>
Date: Wed, 13 Nov 2019 10:38:44 +0800
Subject: [PATCH] net: ethernet: mediatek: Enable GDM GDMA_DROP_ALL mode
Enable GDM GDMA_DROP_ALL mode to drop all packet during the
stop operation. This is recommended by the mt762x HW design
to drop all packet from GMAC before stopping PDMA.
Signed-off-by: MarkLee <Mark-MC.Lee@mediatek.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
@@ -2310,6 +2310,8 @@ static int mtk_stop(struct net_device *d
if (!refcount_dec_and_test(ð->dma_refcnt))
return 0;
+ mtk_gdm_config(eth, MTK_GDMA_DROP_ALL);
+
mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
napi_disable(ð->tx_napi);
--- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
+++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
@@ -85,6 +85,7 @@
#define MTK_GDMA_TCS_EN BIT(21)
#define MTK_GDMA_UCS_EN BIT(20)
#define MTK_GDMA_TO_PDMA 0x0
+#define MTK_GDMA_DROP_ALL 0x7777
/* Unicast Filter MAC Address Register - Low */
#define MTK_GDMA_MAC_ADRL(x) (0x508 + (x * 0x1000))
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