On Mon, Oct 17, 2022 at 09:40:06AM +0100, Jon Hunter wrote:
> This reverts commit 8bb7ff12a91429eb76e093b517ae810b146448fe.
>
> Commit 8bb7ff12a914 ("PCI: tegra: Use PCI_CONF1_EXT_ADDRESS() macro")
> updated the Tegra PCI driver to use the macro PCI_CONF1_EXT_ADDRESS()
> instead of a local function in the Tegra PCI driver. This is breaking
> PCI for some Tegra platforms because, when calculating the offset value,
> the mask applied to the lower 8-bits changed from 0xff to 0xfc. For now,
> fix this by reverting this commit.
>
> Fixes: 8bb7ff12a914 ("PCI: tegra: Use PCI_CONF1_EXT_ADDRESS() macro")
> Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
> ---
> drivers/pci/controller/pci-tegra.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
Acked-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
Bjorn,
can we send it upstream for one of the upcoming -rcX please ?
Thanks,
Lorenzo
> diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
> index 24478ae5a345..8e323e93be91 100644
> --- a/drivers/pci/controller/pci-tegra.c
> +++ b/drivers/pci/controller/pci-tegra.c
> @@ -415,6 +415,13 @@ static inline u32 pads_readl(struct tegra_pcie *pcie, unsigned long offset)
> * address (access to which generates correct config transaction) falls in
> * this 4 KiB region.
> */
> +static unsigned int tegra_pcie_conf_offset(u8 bus, unsigned int devfn,
> + unsigned int where)
> +{
> + return ((where & 0xf00) << 16) | (bus << 16) | (PCI_SLOT(devfn) << 11) |
> + (PCI_FUNC(devfn) << 8) | (where & 0xff);
> +}
> +
> static void __iomem *tegra_pcie_map_bus(struct pci_bus *bus,
> unsigned int devfn,
> int where)
> @@ -436,9 +443,7 @@ static void __iomem *tegra_pcie_map_bus(struct pci_bus *bus,
> unsigned int offset;
> u32 base;
>
> - offset = PCI_CONF1_EXT_ADDRESS(bus->number, PCI_SLOT(devfn),
> - PCI_FUNC(devfn), where) &
> - ~PCI_CONF1_ENABLE;
> + offset = tegra_pcie_conf_offset(bus->number, devfn, where);
>
> /* move 4 KiB window to offset within the FPCI region */
> base = 0xfe100000 + ((offset & ~(SZ_4K - 1)) >> 8);
> --
> 2.25.1
>
