Dragan Simic already had warned me of potential issues with 5.0 GT/s
speed operation in Rockchip PCIe. However, in recent interactions
with Shawn Lin from Rockchip it came to my attention there's grave
danger in the unknown errata regarding 5.0 GT/s operational speed
of their PCIe core. Even if the odds are low, to contain any damage,
let's prevent 5.0 GT/s operation as well as add a comment to
Root Complex driver core, documenting this danger of data loss or
worse.

---

Changes in v3:
- Clarify warning message even though Rockchip won't disclose details
- Drop DT changes as they were applied as subset by Heiko
- Link to v2: https://lore.kernel.org/all/cover.1763415705.git.geraldogabriel@gmail.com/ (local)

Changes in v2:
- hard limit to 2.5 GT/s, not just warn
- add Reported-by: and Reviewed-by: Dragan Simic
- remove redundant declaration of max-link-speed from helios64 dts
- fix Link: of helios64 patch
- simplify RC mode comment
- Link to v1: https://lore.kernel.org/all/aRhR79u5BPtRRFw3@geday/ (local)

---

Geraldo Nascimento (2):
  PCI: rockchip: limit RK3399 to 2.5 GT/s to avoid data loss
  PCI: rockchip-host: comment danger of 5.0 GT/s speed

 drivers/pci/controller/pcie-rockchip-host.c |  4 ++++
 drivers/pci/controller/pcie-rockchip.c      | 10 ++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

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2.52.0