[v2,0/3] PCI: endpoint: Add endpoint restart management support

Message

Kunihiko Hayashi Jan. 24, 2021, 3:09 p.m. UTC

Add new functions to manage recovery of configuration for endpoint controller
and restart the controller when asserting bus-reset from root complex (RC).

This feature is only available if bus-reset (PERST#) line is physically
routed between RC and endpoint, and the signal from RC also resets
the endpoint controller.

This series is only for UniPhier PCIe endpoint controller at this point.

Changes since v1:
- Update the patches to rebase onto the latest tree 

Kunihiko Hayashi (3):
  PCI: endpoint: Add 'started' to pci_epc to set whether the controller
    is started
  PCI: endpoint: Add endpoint restart management
  PCI: uniphier-ep: Add EPC restart management support

 drivers/pci/controller/dwc/Kconfig            |   1 +
 drivers/pci/controller/dwc/pcie-uniphier-ep.c |  44 +++++++++-
 drivers/pci/endpoint/Kconfig                  |   9 ++
 drivers/pci/endpoint/Makefile                 |   1 +
 drivers/pci/endpoint/pci-epc-core.c           |   2 +
 drivers/pci/endpoint/pci-epc-restart.c        | 114 ++++++++++++++++++++++++++
 include/linux/pci-epc.h                       |  22 +++++
 7 files changed, 192 insertions(+), 1 deletion(-)
 create mode 100644 drivers/pci/endpoint/pci-epc-restart.c