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* [PATCH 0/2] Subject: [PATCH 0/2] PCI: cadence: Add LTSSM debugfs
@ 2026-03-15 15:55 Hans Zhang
  2026-03-15 15:55 ` [PATCH 1/2] PCI: cadence: Add HPA architecture flag Hans Zhang
  2026-03-15 15:55 ` [PATCH 2/2] PCI: cadence: Add debugfs property to provide LTSSM status of the PCIe link Hans Zhang
  0 siblings, 2 replies; 6+ messages in thread
From: Hans Zhang @ 2026-03-15 15:55 UTC (permalink / raw)
  To: bhelgaas, lpieralisi, kwilczynski, mani, hans.zhang
  Cc: robh, linux-pci, linux-kernel, Hans Zhang

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.

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 | 211 ++++++++++++++++++
 .../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, 390 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
-- 
2.34.1


^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2026-03-17 15:35 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-03-15 15:55 [PATCH 0/2] Subject: [PATCH 0/2] PCI: cadence: Add LTSSM debugfs Hans Zhang
2026-03-15 15:55 ` [PATCH 1/2] PCI: cadence: Add HPA architecture flag Hans Zhang
2026-03-15 15:55 ` [PATCH 2/2] PCI: cadence: Add debugfs property to provide LTSSM status of the PCIe link Hans Zhang
2026-03-16 17:07   ` kernel test robot
2026-03-17  6:31   ` Shawn Lin
2026-03-17 15:34     ` Hans Zhang

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