On Thursday 27 November 2014 09:54:09 Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> Commit 0b0b0893d49b ("of/pci: Fix the conversion of IO ranges into IO
> resources") changed how I/O resources are parsed from DT. Rather than
> containing the physical address of the I/O region, the addresses will
> now be in I/O address space.
>
> On Tegra the union of all ranges is used to expose a top-level memory-
> mapped resource for the PCI host bridge. This helps to make /proc/iomem
> more readable.
>
> Combining both of the above, the union would now include the I/O space
> region. This causes a regression on Tegra20, where the physical base
> address of the PCIe controller (and therefore of the union) is located
> at physical address 0x80000000. Since I/O space starts at 0, the union
> will now include all of system RAM which starts at 0x00000000.
>
> This commit fixes this by keeping two copies of the I/O range: one that
> represents the range in the CPU's physical address space, the other for
> the range in the I/O address space. This allows the translation setup
> within the driver to reuse the physical addresses. The code registering
> the I/O region with the PCI core uses both ranges to establish the
> mapping.
>
> Fixes: 0b0b0893d49b ("of/pci: Fix the conversion of IO ranges into IO resources")
> Reported-by: Marc Zyngier <marc.zyngier@xxxxxxx>
> Suggested-by: Arnd Bergmann <arnd@xxxxxxxx>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
Reviewed-by: Arnd Bergmann <arnd@xxxxxxxx>
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