Re: [PATCH v2 0/2] PCI: cadence: Add LTSSM debugfs

[Hans Zhang]

Hi,

Sorry for the noise. The patch was sent in error. Re-sent.

Best regards,
Hans


On 3/21/26 11:28, Hans Zhang wrote:
> Hi,
>
> This series adds debugfs support to the Cadence PCIe controller driver,
> allowing users to read the current LTSSM state of the link for debugging
> purposes.
>
> Patch 1 introduces a new flag 'is_hpa' in the cdns_pcie structure to
> distinguish HPA (High Performance Architecture IP) platforms, which
> have a different register layout for LTSSM status.
>
> Patch 2 implements the debugfs file "ltssm_status" under a per-device
> directory. It reads the LTSSM state from the appropriate hardware register
> based on the 'is_hpa' flag and displays both a descriptive string and the
> raw value.
>
> ---
> Changes for v2:
> - s/DW_PCIE_LTSSM_NAME/CDNS_PCIE_LTSSM_NAME/
> - S/January 2026/March 2026/
> - EXPORT_SYMBOL_GPL(cdns_pcie_debugfs_init); // Resolve the following error issues.
>    >> ERROR: modpost: "cdns_pcie_debugfs_init" [drivers/pci/controller/cadence/pcie-cadence-host-mod.ko] undefined!
>    >> ERROR: modpost: "cdns_pcie_debugfs_init" [drivers/pci/controller/cadence/pcie-cadence-ep-mod.ko] undefined!
>
> v1:
> https://patchwork.kernel.org/project/linux-pci/cover/20260315155514.127255-1-18255117159@xxxxxxx/
> ---
>
> Hans Zhang (2):
>    PCI: cadence: Add HPA architecture flag
>    PCI: cadence: Add debugfs property to provide LTSSM status of the PCIe
>      link
>
>   Documentation/ABI/testing/debugfs-cdns-pcie   |   5 +
>   drivers/pci/controller/cadence/Kconfig        |   9 +
>   drivers/pci/controller/cadence/Makefile       |   1 +
>   drivers/pci/controller/cadence/pci-sky1.c     |   1 +
>   .../controller/cadence/pcie-cadence-debugfs.c | 214 ++++++++++++++++++
>   .../pci/controller/cadence/pcie-cadence-ep.c  |   2 +
>   .../cadence/pcie-cadence-host-hpa.c           |   8 +-
>   .../controller/cadence/pcie-cadence-host.c    |   8 +-
>   drivers/pci/controller/cadence/pcie-cadence.h | 147 ++++++++++++
>   9 files changed, 393 insertions(+), 2 deletions(-)
>   create mode 100644 Documentation/ABI/testing/debugfs-cdns-pcie
>   create mode 100644 drivers/pci/controller/cadence/pcie-cadence-debugfs.c
>
>
> base-commit: 1c9982b4961334c1edb0745a04cabd34bc2de675