Port of a Linux commit d91dfe5054d4f2c424bd70ca34fc3328ee179f20 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 <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Acked-by: Joao Pinto <[email protected]> Acked-by: Roy Zang <[email protected]> Signed-off-by: Andrey Smirnov <[email protected]> --- drivers/pci/pcie-designware-host.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pcie-designware-host.c b/drivers/pci/pcie-designware-host.c index 9a9d4f9ae..27d574da6 100644 --- a/drivers/pci/pcie-designware-host.c +++ b/drivers/pci/pcie-designware-host.c @@ -388,8 +388,12 @@ void dw_pcie_setup_rc(struct pcie_port *pp) dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0); - /* Program correct class for RC */ + /* 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; -- 2.19.1 _______________________________________________ barebox mailing list [email protected] http://lists.infradead.org/mailman/listinfo/barebox
