[PATCH v5 03/18] PCI: designware-ep: Read-only registers need DBI_RO_WR_EN to be writable

[Niklas Cassel]

Certain registers that pcie-designware-ep tries to write to are read-only
registers. However, these registers can become read/write if we first
enable the DBI_RO_WR_EN bit. Set/unset the DBI_RO_WR_EN bit before/after
writing these registers.

Signed-off-by: Niklas Cassel <niklas.cas...@axis.com>
---
 drivers/pci/dwc/pcie-designware-ep.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/pci/dwc/pcie-designware-ep.c 
b/drivers/pci/dwc/pcie-designware-ep.c
index c92ab87fd660..3fb34be99715 100644
--- a/drivers/pci/dwc/pcie-designware-ep.c
+++ b/drivers/pci/dwc/pcie-designware-ep.c
@@ -35,8 +35,10 @@ static void dw_pcie_ep_reset_bar(struct dw_pcie *pci, enum 
pci_barno bar)
        u32 reg;
 
        reg = PCI_BASE_ADDRESS_0 + (4 * bar);
+       dw_pcie_dbi_ro_wr_en(pci);
        dw_pcie_writel_dbi2(pci, reg, 0x0);
        dw_pcie_writel_dbi(pci, reg, 0x0);
+       dw_pcie_dbi_ro_wr_dis(pci);
 }
 
 static int dw_pcie_ep_write_header(struct pci_epc *epc,
@@ -45,6 +47,7 @@ static int dw_pcie_ep_write_header(struct pci_epc *epc,
        struct dw_pcie_ep *ep = epc_get_drvdata(epc);
        struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 
+       dw_pcie_dbi_ro_wr_en(pci);
        dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, hdr->vendorid);
        dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, hdr->deviceid);
        dw_pcie_writeb_dbi(pci, PCI_REVISION_ID, hdr->revid);
@@ -58,6 +61,7 @@ static int dw_pcie_ep_write_header(struct pci_epc *epc,
        dw_pcie_writew_dbi(pci, PCI_SUBSYSTEM_ID, hdr->subsys_id);
        dw_pcie_writeb_dbi(pci, PCI_INTERRUPT_PIN,
                           hdr->interrupt_pin);
+       dw_pcie_dbi_ro_wr_dis(pci);
 
        return 0;
 }
@@ -142,8 +146,10 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, enum 
pci_barno bar,
        if (ret)
                return ret;
 
+       dw_pcie_dbi_ro_wr_en(pci);
        dw_pcie_writel_dbi2(pci, reg, size - 1);
        dw_pcie_writel_dbi(pci, reg, flags);
+       dw_pcie_dbi_ro_wr_dis(pci);
 
        return 0;
 }
@@ -223,7 +229,9 @@ static int dw_pcie_ep_set_msi(struct pci_epc *epc, u8 
encode_int)
        val = dw_pcie_readw_dbi(pci, MSI_MESSAGE_CONTROL);
        val &= ~MSI_CAP_MMC_MASK;
        val |= (encode_int << MSI_CAP_MMC_SHIFT) & MSI_CAP_MMC_MASK;
+       dw_pcie_dbi_ro_wr_en(pci);
        dw_pcie_writew_dbi(pci, MSI_MESSAGE_CONTROL, val);
+       dw_pcie_dbi_ro_wr_dis(pci);
 
        return 0;
 }
-- 
2.14.2