Merge branch 'pci/controller/rockchip'

- Fix address translation unit programming (Damien Le Moal)

- Define ROCKCHIP_PCIE_AT_SIZE_ALIGN to replace magic 256 endpoint .align
  value (Damien Le Moal)

- When unmapping an endpoint window, compute the region index instead of
  searching for it, and verify that the address was mapped (Damien Le Moal)

- When mapping an endpoint window, verify that the address hasn't been
  mapped already (Damien Le Moal)

- Implement pci_epc_ops.align_addr() for rockchip-ep (Damien Le Moal)

- Fix MSI IRQ data mapping to observe the alignment constraint, which fixes
  intermittent page faults in memcpy_toio() and memcpy_fromio() (Damien Le
  Moal)

- Rename rockchip_pcie_parse_ep_dt() to rockchip_pcie_ep_get_resources()
  for consistency with similar DT interfaces (Damien Le Moal)

- Factor out memory allocations to tidy rockchip_pcie_ep_probe() (Damien Le
  Moal)

- Factor out MSI-X quirk to tidy rockchip_pcie_ep_probe() (Damien Le Moal)

- Skip the unnecessary link train in rockchip_pcie_ep_probe() and only in
  the endpoint start operation (Damien Le Moal)

- Implement pci_epc_ops.stop_link() to disable link training and controller
  configuration (Damien Le Moal)

- Attempt link training at 5 GT/s when both partners support it (Damien Le
  Moal)

- Add a handler for PERST# signal so we can detect host resets and start
  link training when exiting reset (Damien Le Moal)

* pci/controller/rockchip:
  PCI: rockchip-ep: Handle PERST# signal in EP mode
  PCI: rockchip-ep: Improve link training
  PCI: rockship-ep: Implement the pci_epc_ops::stop_link() operation
  PCI: rockchip-ep: Refactor endpoint link training enable
  PCI: rockchip-ep: Refactor rockchip_pcie_ep_probe() MSI-X hiding
  PCI: rockchip-ep: Refactor rockchip_pcie_ep_probe() memory allocations
  PCI: rockchip-ep: Rename rockchip_pcie_parse_ep_dt()
  PCI: rockchip-ep: Fix MSI IRQ data mapping
  PCI: rockchip-ep: Implement the pci_epc_ops::align_addr() operation
  PCI: rockchip-ep: Improve rockchip_pcie_ep_map_addr()
  PCI: rockchip-ep: Improve rockchip_pcie_ep_unmap_addr()
  PCI: rockchip-ep: Use a macro to define EP controller .align feature
  PCI: rockchip-ep: Fix address translation unit programming