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Sat, 15 Nov 2025 01:56:02 -0800 (PST) Date: Sat, 15 Nov 2025 06:55:55 -0300 From: Geraldo Nascimento To: Dragan Simic Cc: linux-rockchip@lists.infradead.org, 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 Subject: Re: [PATCH 3/3] arm64: dts: rockchip: drop max-link-speed = <2> in helios64 PCIe Message-ID: References: <53332edec449b84d8a962f2b5995667766359772.1763197368.git.geraldogabriel@gmail.com> <3f13841d-030b-0202-61be-412c0ab9df6b@manjaro.org> <7d300769-9803-9c0c-60bb-4a724619d8e0@manjaro.org> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7d300769-9803-9c0c-60bb-4a724619d8e0@manjaro.org> On Sat, Nov 15, 2025 at 10:42:40AM +0100, Dragan Simic wrote: > On Saturday, November 15, 2025 10:36 CET, "Dragan Simic" wrote: > > On Saturday, November 15, 2025 10:10 CET, Geraldo Nascimento wrote: > > > Shawn Lin from Rockchip strongly discourages attempts to use their > > > RK3399 PCIe core at 5.0 GT/s speed, citing concerns about catastrophic > > > failures that may happen. Even if the odds are low, drop from last user > > > of this property for the RK3399 platform, helios64. > > > > > > Fixes: 755fff528b1b ("arm64: dts: rockchip: add variables for pcie completion to helios64") > > > Link: https://lore.kernel.org/all/ffd05070-9879-4468-94e3-b88968b4c21b@rock-chips.com/ > > > Reported-by: Shawn Lin > > > Signed-off-by: Geraldo Nascimento > > > --- > > > arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts | 1 - > > > 1 file changed, 1 deletion(-) > > > > > > diff --git a/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts b/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts > > > index e7d4a2f9a95e..78a7775c3b22 100644 > > > --- a/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts > > > +++ b/arch/arm64/boot/dts/rockchip/rk3399-kobol-helios64.dts > > > @@ -424,7 +424,6 @@ &pcie_phy { > > > > > > &pcie0 { > > > ep-gpios = <&gpio2 RK_PD4 GPIO_ACTIVE_HIGH>; > > > - max-link-speed = <2>; > > > num-lanes = <2>; > > > pinctrl-names = "default"; > > > status = "okay"; > > > > Looking good to me, this rounds up the prevention of issues > > coming from buggy PCIe Gen2 on RK3399. > > > > Please feel free to include > > > > Reviewed-by: Dragan Simic > > > > Though, could you, please, add patch 4/3 to this series, which > > would remove the redundant parameter "max-link-speed = <1>" from > > rk3399-nanopi-r4s.dtsi? > > Sorry, I forgot to note that the patch summary would read a bit > better if it were reworded like this: > > arm64: dts: rockchip: Remove redundant max-link-speed from helios64 board dts > No, I think: arm64: dts: rockchip: Remove dangerous max-link-speed from helios64 board dts Is more accurately described. With focus on the dangerous, we're not liable. Redudant max-link-speed only for nanopi-r4s include definitions I think! Thanks, Geraldo Nascimento