[PATCH v5 00/14] Fix and improve the Rockchip endpoint driver

[Damien Le Moal]

This patch series fix the PCI address mapping handling of the Rockchip
PCI endpoint driver, refactor some of its code, improves link training
and adds handling of the PERST# signal.

This series is organized as follows:
 - Patch 1 fixes the rockchip ATU programming
 - Patch 2, 3 and 4 introduce small code improvments
 - Patch 5 implements the .align_addr() operation to make the RK3399
   endpoint controller driver fully functional with the new
   pci_epc_mem_map() function
 - Patch 6 uses the new align_addr operation function to fix the ATU
   programming for MSI IRQ data mapping
 - Patch 7, 8, 9 and 10 refactor the driver code to make it more
   readable
 - Patch 11 introduces the .stop() endpoint controller operation to
   correctly disable the endpopint controller after use
 - Patch 12 improves link training
 - Patch 13 implements handling of the #PERST signal
 - Patch 14 adds a DT overlay file to enable EP mode and define the
   PERST# GPIO (reset-gpios) property.

These patches were tested using a Pine Rockpro64 board used as an
endpoint with the test endpoint function driver and a prototype nvme
endpoint function driver.

Changes from v4:
 - Added patch 6
 - Added comments to patch 12 and 13 to clarify link training handling
   and PERST# GPIO use.
 - Added patch 14

Changes from v3:
 - Addressed Mani's comments (see mailing list for details).
 - Removed old patch 11 (dt-binding changes) and instead use in patch 12
   the already defined reset_gpios property.
 - Added patch 6
 - Added review tags

Changes from v2:
 - Split the patch series
 - Corrected patch 11 to add the missing "maxItem"

Changes from v1:
 - Changed pci_epc_check_func() to pci_epc_function_is_valid() in patch
   1.
 - Removed patch "PCI: endpoint: Improve pci_epc_mem_alloc_addr()"
   (former patch 2 of v1)
 - Various typos cleanups all over. Also fixed some blank space
   indentation.
 - Added review tags

Damien Le Moal (14):
  PCI: rockchip-ep: Fix address translation unit programming
  PCI: rockchip-ep: Use a macro to define EP controller .align feature
  PCI: rockchip-ep: Improve rockchip_pcie_ep_unmap_addr()
  PCI: rockchip-ep: Improve rockchip_pcie_ep_map_addr()
  PCI: rockchip-ep: Implement the pci_epc_ops::align_addr() operation
  PCI: rockchip-ep: Fix MSI IRQ data mapping
  PCI: rockchip-ep: Rename rockchip_pcie_parse_ep_dt()
  PCI: rockchip-ep: Refactor rockchip_pcie_ep_probe() memory allocations
  PCI: rockchip-ep: Refactor rockchip_pcie_ep_probe() MSI-X hiding
  PCI: rockchip-ep: Refactor endpoint link training enable
  PCI: rockship-ep: Implement the pci_epc_ops::stop_link() operation
  PCI: rockchip-ep: Improve link training
  PCI: rockchip-ep: Handle PERST# signal in endpoint mode
  arm64: dts: rockchip: Add rockpro64 overlay for PCIe endpoint mode

 arch/arm64/boot/dts/rockchip/Makefile         |   1 +
 .../rockchip/rk3399-rockpro64-pcie-ep.dtso    |  20 +
 drivers/pci/controller/pcie-rockchip-ep.c     | 432 ++++++++++++++----
 drivers/pci/controller/pcie-rockchip-host.c   |   4 +-
 drivers/pci/controller/pcie-rockchip.c        |  21 +-
 drivers/pci/controller/pcie-rockchip.h        |  24 +-
 6 files changed, 406 insertions(+), 96 deletions(-)
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3399-rockpro64-pcie-ep.dtso

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2.47.0