[PATCH] Revert "PCI: tegra: Use PCI_CONF1_EXT_ADDRESS() macro"

[Jon Hunter <jonathanh@nvidia.com>]

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@nvidia.com>
---
 drivers/pci/controller/pci-tegra.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

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