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Sat, 15 Nov 2025 01:10:09 -0800 (PST) Received: from geday ([2804:7f2:800b:a07a::dead:c001]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-11b06088604sm20965645c88.7.2025.11.15.01.10.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 15 Nov 2025 01:10:08 -0800 (PST) Date: Sat, 15 Nov 2025 06:10:01 -0300 From: Geraldo Nascimento To: linux-rockchip@lists.infradead.org Cc: Shawn Lin , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Bjorn Helgaas , Heiko Stuebner , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Krzysztof Kozlowski , Conor Dooley , Johan Jonker , Geraldo Nascimento , Dragan Simic Subject: [PATCH 0/3] PCI: rockchip: 5.0 GT/s speed may be dangerous Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20251115_011010_665152_459EF41E X-CRM114-Status: UNSURE ( 9.48 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In recent interactions with Shawn Lin from Rockchip it came to my attention there's an unknown errata regarding 5.0 GT/s operational speed of their PCIe core. According to Shawn there's grave danger 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. Geraldo Nascimento (3): PCI: rockchip: warn of danger of 5.0 GT/s speeds PCI: rockchip-host: comment danger of 5.0 GT/s speed arm64: dts: rockchip: drop max-link-speed = <2> in helios64 PCIe arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts | 1 - drivers/pci/controller/pcie-rockchip-host.c | 5 +++++ drivers/pci/controller/pcie-rockchip.c | 8 ++++++-- 3 files changed, 11 insertions(+), 3 deletions(-) -- 2.49.0