0316b05311
The ar724x pci driver expects the PCIe controller to be brought out of reset by the bootloader. At least the AVM Fritz 300E bootloader doesn't take care of releasing the different PCIe controller related resets which causes an endless hang as soon as either the PCIE Reset register (0x180f0018) or the PCI Application Control register (0x180f0000) is read from. Do the full "PCIE Root Complex Initialization Sequence" if the PCIe host controller is still in reset during probing. The QCA u-boot sleeps 10ms after the PCIE Application Control bit is set to ready. It has been shown that 10ms might not be enough time if PCIe should be used right after setting the bit. During my tests it took up to 20ms till the link was up. Giving the link up to 100ms should work for all cases. Signed-off-by: Mathias Kresin <dev@kresin.me> Signed-off-by: John Crispin <john@phrozen.org> Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/19916/ Cc: James Hogan <jhogan@kernel.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.