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Function 'mt7621_pci_parse_request_of_pci_ranges' is using 'of_pci_range_to_resource' to get both mem and io resources. Internally this function calls to 'pci_address_to_pio' which returns -1 if io space address is an address > IO_SPACE_LIMIT which is 0xFFFF for mips. This mt7621 soc has io space in physical address 0x1e160000. In order to fix this, overwrite invalid io 0xffffffff with properly values from the device tree and set mapped address of this resource as io port base memory address calling 'set_io_port_base' function. There is also need to properly setup resource limits and io and memory windows with properly parsed values instead of set them as 'no limit' which it is wrong. For any reason I don't really know legacy driver sets up mem window as 0xFFFFFFFF and any other value seems to does not work as expected, so set up also here with same values. Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com> Link: https://lore.kernel.org/r/20200318094445.19669-1-sergio.paracuellos@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.