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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>