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

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Message-ID: <176641067349.1648325.7613113925741792154.b4-ty@sntech.de>
Date: Mon, 22 Dec 2025 14:38:24 +0100
From: Heiko Stuebner <heiko@...ech.de>
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>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Johan Jonker <jbx6244@...il.com>,
	Dragan Simic <dsimic@...jaro.org>,
	Geraldo Nascimento <geraldogabriel@...il.com>
Cc: Heiko Stuebner <heiko@...ech.de>,
	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: Re: (subset) [PATCH v2 0/4] PCI: rockchip: 5.0 GT/s speed may be dangerous


On Mon, 17 Nov 2025 18:46:43 -0300, Geraldo Nascimento wrote:
> 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
> 
> [...]

Applied, thanks!

[3/4] arm64: dts: rockchip: remove dangerous max-link-speed from helios64
      commit: 0368e4afcf20f377c81fa77b1c7d0dee4a625a44
[4/4] arm64: dts: rockchip: remove redundant max-link-speed from nanopi-r4s
      commit: ce652c98a7bfa0b7c675ef5cd85c44c186db96af

Best regards,
-- 
Heiko Stuebner <heiko@...ech.de>