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PCI: dwc: Enable write permission for Class Code, Interrupt Pin updates 

dw_pcie_setup_rc() contains fixes to update the Class Code and Interrupt
Pin registers, but the fixes don't actually work because these registers
are read-only.

Enable write permission before updating the Class Code and Interrupt
Pin.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Joao Pinto <jpinto@synopsys.com>
Acked-by: Roy Zang <tie-fei.zang@freescale.com>
This commit is contained in:
Hou Zhiqiang 2017-08-28 18:53:00 +08:00 committed by Bjorn Helgaas
parent e44abfed6f
commit d91dfe5054
1 changed files with 6 additions and 0 deletions
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6
drivers/pci/dwc/pcie-designware-host.c
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@ -597,10 +597,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
dw_pcie_writel_dbi(pci, PCI_BASE_ADDRESS_1, 0x00000000);
/* setup interrupt pins */
dw_pcie_dbi_ro_wr_en(pci);
val = dw_pcie_readl_dbi(pci, PCI_INTERRUPT_LINE);
val &= 0xffff00ff;
val |= 0x00000100;
dw_pcie_writel_dbi(pci, PCI_INTERRUPT_LINE, val);
dw_pcie_dbi_ro_wr_dis(pci);
/* setup bus numbers */
val = dw_pcie_readl_dbi(pci, PCI_PRIMARY_BUS);
@ -637,8 +639,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
/* Enable write permission for the DBI read-only register */
dw_pcie_dbi_ro_wr_en(pci);
/* program correct class for RC */
dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
/* Better disable write permission right after the update */
dw_pcie_dbi_ro_wr_dis(pci);
dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
val |= PORT_LOGIC_SPEED_CHANGE;