linux-kernel - [PATCH v2 0/4] PCI: rockchip: 5.0 GT/s speed may be dangerous

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Message-ID: <cover.1763415705.git.geraldogabriel@gmail.com>
Date: Mon, 17 Nov 2025 18:46:43 -0300
From: Geraldo Nascimento <geraldogabriel@...il.com>
To: Shawn Lin <shawn.lin@...k-chips.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kwilczynski@...nel.org>,
	Manivannan Sadhasivam <mani@...nel.org>,
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Johan Jonker <jbx6244@...il.com>,
	Geraldo Nascimento <geraldogabriel@...il.com>,
	Dragan Simic <dsimic@...jaro.org>
Cc: linux-rockchip@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: [PATCH v2 0/4] PCI: rockchip: 5.0 GT/s speed may be dangerous

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 cover the remaining corner-cases where the default would lead
to 5.0 GT/s operation as well as add a comment to Root Complex driver
core, documenting this danger. Furthermore, remove redundant
declaration of max-link-speed from rk3399-nanopi-r4s.dtsi

Signed-off-by: Geraldo Nascimento <geraldogabriel@...il.com>

---

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/

Geraldo Nascimento (4):
  PCI: rockchip: limit RK3399 to 2.5 GT/s to prevent damage
  PCI: rockchip-host: comment danger of 5.0 GT/s speed
  arm64: dts: rockchip: remove dangerous max-link-speed from helios64
  arm64: dts: rockchip: remove redundant max-link-speed from nanopi-r4s

 arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts |  1 -
 arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dtsi    |  1 -
 drivers/pci/controller/pcie-rockchip-host.c            |  3 +++
 drivers/pci/controller/pcie-rockchip.c                 | 10 ++++++++--
 4 files changed, 11 insertions(+), 4 deletions(-)

-- 
2.49.0