[PATCH 4.14 35/41] PCI: designware-ep: Read-only registers need DBI_RO_WR_EN to be writable

[Greg Kroah-Hartman]

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Niklas Cassel <niklas.cassel@xxxxxxxx>

commit 1cab826b30c6275d479a6ab1dea1067e15dbec62 upstream.

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.

Tested-by: Gustavo Pimentel <gustavo.pimentel@xxxxxxxxxxxx>
Signed-off-by: Niklas Cassel <niklas.cassel@xxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Acked-by: Joao Pinto <jpinto@xxxxxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/pci/dwc/pcie-designware-ep.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- 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
 	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(struc
 	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(struc
 	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
 	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;
 }
@@ -217,7 +223,9 @@ static int dw_pcie_ep_set_msi(struct pci
 	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;
 }