[PATCH 3/3] ARM: footbridge: restore allocation of CSR I/O resource

[Arnd Bergmann]

On Fri, Mar 26, 2021 at 1:18 PM Russell King <rmk+kernel at armlinux.org.uk> wrote:
>
> Commit 8ef6e6201b2 ("ARM: footbridge: use fixed PCI i/o mapping") made
> two changes: it contains what it says in the summary line, but it also
> removes the CSR I/O allocation, which effectively means the DC21285
> responds to I/O accesses at address 0..0x7f, which overlap Southbridge
> ISA resources on the same PCI bus.
>
> This commit fixes it, but depends on the previous two commits removing
> the bus level PCI I/O resource:
>   ARM: footbridge: avoid using separate PCI I/O bus resource
>   ARM: pci: make bus I/O resources optional
>
> Fixes: 8ef6e6201b2 ("ARM: footbridge: use fixed PCI i/o mapping")
> Signed-off-by: Russell King <rmk+kernel at armlinux.org.uk>

Reviewed-by: Arnd Bergmann <arnd at arndb.de>

This fix is needed regardless of which way the first patch fixes the
bus resource.

        Arnd