[PATCH v4 00/12] Fix and improve the Rockchip endpoint driver

[Damien Le Moal <dlemoal@kernel.org>]

This patch series fix the PCI address mapping handling of the Rockchip
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 .get_mem_map() operation to make the RK3399
   endpoint controller driver fully functional with the new
   pci_epc_mem_map() function
 - Patch 6, 7, 8 and 9 refactor the driver code to make it more readable
 - Patch 10 introduces the .stop() endpoint controller operation to
   correctly disable the endpopint controller after use
 - Patch 11 improves link training
 - Patch 12 implements handling of the #PERST signal

This patch series depends on the PCI endpoint core patches from the
V5 series "Improve PCI memory mapping API". The 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 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 (12):
  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::get_mem_map() operation
  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

 drivers/pci/controller/pcie-rockchip-ep.c   | 408 ++++++++++++++++----
 drivers/pci/controller/pcie-rockchip-host.c |   4 +-
 drivers/pci/controller/pcie-rockchip.c      |  21 +-
 drivers/pci/controller/pcie-rockchip.h      |  24 +-
 4 files changed, 370 insertions(+), 87 deletions(-)

-- 
2.47.0