linux-kernel - Re: [PATCH 3/3] arm64: dts: rockchip: drop max-link-speed = <2> in helios64 PCIe

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Message-ID: <a99f926c-e65f-8d0d-67bf-0dd4f9211970@manjaro.org>
Date: Sat, 15 Nov 2025 11:03:19 +0100
From: "Dragan Simic" <dsimic@...jaro.org>
To: "Geraldo Nascimento" <geraldogabriel@...il.com>
Cc: linux-rockchip@...ts.infradead.org, "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>, linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, "Krzysztof Kozlowski" <krzk+dt@...nel.org>, "Conor Dooley" <conor+dt@...nel.org>, "Johan Jonker" <jbx6244@...il.com>
Subject: Re: [PATCH 3/3] arm64: dts: rockchip: drop max-link-speed = <2> in 
 helios64 PCIe

On Saturday, November 15, 2025 10:55 CET, Geraldo Nascimento <geraldogabriel@...il.com> wrote:
> On Sat, Nov 15, 2025 at 10:42:40AM +0100, Dragan Simic wrote:
> > On Saturday, November 15, 2025 10:36 CET, "Dragan Simic" <dsimic@...jaro.org> wrote:
> > > On Saturday, November 15, 2025 10:10 CET, Geraldo Nascimento <geraldogabriel@...il.com> 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 <shawn.lin@...k-chips.com>
> > > > Signed-off-by: Geraldo Nascimento <geraldogabriel@...il.com>
> > > > ---
> > > >  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 <dsimic@...jaro.org>
> > > 
> > > 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!

Indeed, you're right.  It was obviously an -ENOCOFFEE on my part. :)