PCI: layerscape: Fix MSG TLP drop setting
Some kinds of Layerscape PCIe controllers will forward the received message TLPs to system application address space, which could corrupt system memory or lead to a system hang. Enable MSG_DROP to fix this issue. Signed-off-by: Minghuan Lian <Minghuan.Lian@nxp.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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@ -77,6 +77,16 @@ static void ls_pcie_fix_class(struct ls_pcie *pcie)
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iowrite16(PCI_CLASS_BRIDGE_PCI, pcie->dbi + PCI_CLASS_DEVICE);
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}
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/* Drop MSG TLP except for Vendor MSG */
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static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
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{
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u32 val;
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val = ioread32(pcie->dbi + PCIE_STRFMR1);
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val &= 0xDFFFFFFF;
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iowrite32(val, pcie->dbi + PCIE_STRFMR1);
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}
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static int ls1021_pcie_link_up(struct pcie_port *pp)
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{
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u32 state;
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@ -97,7 +107,7 @@ static int ls1021_pcie_link_up(struct pcie_port *pp)
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static void ls1021_pcie_host_init(struct pcie_port *pp)
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{
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struct ls_pcie *pcie = to_ls_pcie(pp);
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u32 val, index[2];
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u32 index[2];
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pcie->scfg = syscon_regmap_lookup_by_phandle(pp->dev->of_node,
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"fsl,pcie-scfg");
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@ -116,13 +126,7 @@ static void ls1021_pcie_host_init(struct pcie_port *pp)
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dw_pcie_setup_rc(pp);
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/*
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* LS1021A Workaround for internal TKT228622
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* to fix the INTx hang issue
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*/
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val = ioread32(pcie->dbi + PCIE_STRFMR1);
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val &= 0xffff;
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iowrite32(val, pcie->dbi + PCIE_STRFMR1);
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ls_pcie_drop_msg_tlp(pcie);
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}
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static int ls_pcie_link_up(struct pcie_port *pp)
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@ -147,6 +151,7 @@ static void ls_pcie_host_init(struct pcie_port *pp)
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iowrite32(1, pcie->dbi + PCIE_DBI_RO_WR_EN);
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ls_pcie_fix_class(pcie);
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ls_pcie_clear_multifunction(pcie);
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ls_pcie_drop_msg_tlp(pcie);
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iowrite32(0, pcie->dbi + PCIE_DBI_RO_WR_EN);
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}
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