On Sat, Sep 23, 2017 at 11:48 AM, Thierry Reding
<thierry.reding@xxxxxxxxx> wrote:
> The Tegra PCI host controller can generate configuration space accesses
> with byte, word and dword granularity for devices. Only root ports can't
> have their configuration space accessed in this way.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> ---
> drivers/pci/host/pci-tegra.c | 24 ++++++++++++++++++++++--
> 1 file changed, 22 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
> index 9c40da54f88a..e8e1ddbaabc9 100644
> --- a/drivers/pci/host/pci-tegra.c
> +++ b/drivers/pci/host/pci-tegra.c
> @@ -491,12 +491,32 @@ static void __iomem *tegra_pcie_map_bus(struct pci_bus *bus,
> return addr;
> }
>
> +static int tegra_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
> + int where, int size, u32 *value)
> +{
> + if (bus->number == 0)
> + return pci_generic_config_read32(bus, devfn, where, size,
> + value);
> +
> + return pci_generic_config_read(bus, devfn, where, size, value);
Since T20, T30 and T124 had issues with 8-bit and 16-bit end point
config accesses, generic accessors should be used only for T210
> +}
> +
> +static int tegra_pcie_config_write(struct pci_bus *bus, unsigned int devfn,
> + int where, int size, u32 value)
> +{
> + if (bus->number == 0)
> + return pci_generic_config_write32(bus, devfn, where, size,
> + value);
> +
> + return pci_generic_config_write(bus, devfn, where, size, value);
same as above.
> +}
> +
> static struct pci_ops tegra_pcie_ops = {
> .add_bus = tegra_pcie_add_bus,
> .remove_bus = tegra_pcie_remove_bus,
> .map_bus = tegra_pcie_map_bus,
> - .read = pci_generic_config_read32,
> - .write = pci_generic_config_write32,
> + .read = tegra_pcie_config_read,
> + .write = tegra_pcie_config_write,
> };
>
> static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
> --
> 2.14.1
>
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