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All platforms using Rockchip use a common clock for the Root Port and the slot connected to it. Indicate this by setting the Slot Clock Configuration (PCI_EXP_LNKSTA_SLC) bit in the Root Port's Link Status. Per the Implementation Note in the spec (PCIe r3.1, sec 7.8.7), if the downstream component also sets PCI_EXP_LNKSTA_SLC, software may set the Common Clock Configuration (PCI_EXP_LNKCTL_CCC) bits on both ends of the Link. This is done by pcie_aspm_configure_common_clock(). Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Cc: Brian Norris <briannorris@chromium.org> Cc: jeffy.chen <jeffy.chen@rock-chips.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.