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Mon, 17 Nov 2025 13:46:58 -0800 (PST) Received: from geday ([2804:7f2:800b:a807::dead:c001]) by smtp.gmail.com with ESMTPSA id 5614622812f47-4508a6df248sm4594480b6e.22.2025.11.17.13.46.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Nov 2025 13:46:57 -0800 (PST) Date: Mon, 17 Nov 2025 18:46:43 -0300 From: Geraldo Nascimento To: Shawn Lin , Lorenzo Pieralisi , Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= , Manivannan Sadhasivam , Rob Herring , Bjorn Helgaas , Heiko Stuebner , Krzysztof Kozlowski , Conor Dooley , Johan Jonker , Geraldo Nascimento , Dragan Simic Cc: linux-rockchip@lists.infradead.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v2 0/4] 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-20251117_134659_327922_3F3ADA85 X-CRM114-Status: GOOD ( 11.42 ) 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 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 --- 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