git.openwrt.org Git - openwrt/staging/xback.git/blob

   1 From: Rex Lu <rex.lu@mediatek.com>
   2 Date: Thu, 9 Oct 2025 08:29:34 +0200
   3 Subject: [PATCH] net: mtk: wed: add dma mask limitation and GFP_DMA32 for
   4  device with more than 4GB DRAM
   5
   6 Limit tx/rx buffer address to 32-bit address space for board with more
   7 than 4GB DRAM.
   8
   9 Fixes: 804775dfc2885 ("net: ethernet: mtk_eth_soc: add support for Wireless Ethernet Dispatch (WED)")
  10 Fixes: 6757d345dd7db ("net: ethernet: mtk_wed: introduce hw_rro support for MT7988")
  11 Tested-by: Daniel Pawlik <pawlik.dan@gmail.com>
  12 Tested-by: Matteo Croce <teknoraver@meta.com>
  13 Signed-off-by: Rex Lu <rex.lu@mediatek.com>
  14 Co-developed-by: Lorenzo Bianconi <lorenzo@kernel.org>
  15 Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
  16 Reviewed-by: Simon Horman <horms@kernel.org>
  17 Signed-off-by: David S. Miller <davem@davemloft.net>
  18 ---
  19
  20 --- a/drivers/net/ethernet/mediatek/mtk_wed.c
  21 +++ b/drivers/net/ethernet/mediatek/mtk_wed.c
  22 @@ -677,7 +677,7 @@ mtk_wed_tx_buffer_alloc(struct mtk_wed_d
  23                 void *buf;
  24                 int s;
  25
  26 -               page = __dev_alloc_page(GFP_KERNEL);
  27 +               page = __dev_alloc_page(GFP_KERNEL | GFP_DMA32);
  28                 if (!page)
  29                         return -ENOMEM;
  30
  31 @@ -800,7 +800,7 @@ mtk_wed_hwrro_buffer_alloc(struct mtk_we
  32                 struct page *page;
  33                 int s;
  34
  35 -               page = __dev_alloc_page(GFP_KERNEL);
  36 +               page = __dev_alloc_page(GFP_KERNEL | GFP_DMA32);
  37                 if (!page)
  38                         return -ENOMEM;
  39
  40 @@ -2438,6 +2438,10 @@ mtk_wed_attach(struct mtk_wed_device *de
  41         dev->version = hw->version;
  42         dev->hw->pcie_base = mtk_wed_get_pcie_base(dev);
  43
  44 +       ret = dma_set_mask_and_coherent(hw->dev, DMA_BIT_MASK(32));
  45 +       if (ret)
  46 +               goto out;
  47 +
  48         if (hw->eth->dma_dev == hw->eth->dev &&
  49             of_dma_is_coherent(hw->eth->dev->of_node))
  50                 mtk_eth_set_dma_device(hw->eth, hw->dev);