target/linux/generic/backport-5.4/762-net-ethernet-mediatek-Enable-GDM-GDMA_DROP_ALL-mode.patch

   1 From: MarkLee <Mark-MC.Lee@mediatek.com>
   2 Date: Wed, 13 Nov 2019 10:38:44 +0800
   3 Subject: [PATCH] net: ethernet: mediatek: Enable GDM GDMA_DROP_ALL mode
   4
   5 Enable GDM GDMA_DROP_ALL mode to drop all packet during the
   6 stop operation. This is recommended by the mt762x HW design
   7 to drop all packet from GMAC before stopping PDMA.
   8
   9 Signed-off-by: MarkLee <Mark-MC.Lee@mediatek.com>
  10 Signed-off-by: David S. Miller <davem@davemloft.net>
  11 ---
  12
  13 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  14 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c
  15 @@ -2331,6 +2331,8 @@ static int mtk_stop(struct net_device *d
  16         if (!refcount_dec_and_test(&eth->dma_refcnt))
  17                 return 0;
  18
  19 +       mtk_gdm_config(eth, MTK_GDMA_DROP_ALL);
  20 +
  21         mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
  22         mtk_rx_irq_disable(eth, MTK_RX_DONE_INT);
  23         napi_disable(&eth->tx_napi);
  24 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h
  25 +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h
  26 @@ -85,6 +85,7 @@
  27  #define MTK_GDMA_TCS_EN                BIT(21)
  28  #define MTK_GDMA_UCS_EN                BIT(20)
  29  #define MTK_GDMA_TO_PDMA       0x0
  30 +#define MTK_GDMA_DROP_ALL       0x7777
  31
  32  /* Unicast Filter MAC Address Register - Low */
  33  #define MTK_GDMA_MAC_ADRL(x)   (0x508 + (x * 0x1000))