linux-kernel - Re: [PATCH 0/2] PCI/ASPM: Avoid L0s and L1 on Sophgo 2042/2044 PCIe Root Ports

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Message-ID: <aVOygptfKzyKsZf2@inochi.infowork>
Date: Tue, 30 Dec 2025 19:08:06 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Manivannan Sadhasivam <mani@...nel.org>, 
	Inochi Amaoto <inochiama@...il.com>
Cc: Bjorn Helgaas <helgaas@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Chen Wang <unicorn_wang@...look.com>, 
	Han Gao <rabenda.cn@...il.com>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Yixun Lan <dlan@...too.org>, Longbin Li <looong.bin@...il.com>
Subject: Re: [PATCH 0/2] PCI/ASPM: Avoid L0s and L1 on Sophgo 2042/2044 PCIe
 Root Ports

On Tue, Dec 30, 2025 at 03:38:11PM +0530, Manivannan Sadhasivam wrote:
> On Tue, Dec 30, 2025 at 05:45:39PM +0800, Inochi Amaoto wrote:
> > On Fri, Dec 26, 2025 at 10:30:31AM -0600, Bjorn Helgaas wrote:
> > > On Thu, Dec 25, 2025 at 06:05:27PM +0800, Inochi Amaoto wrote:
> > > > Since commit f3ac2ff14834 ("PCI/ASPM: Enable all ClockPM and ASPM
> > > > states for devicetree platforms") force enable ASPM on all device tree
> > > > platform, the SG2042/SG2044 PCIe Root Ports breaks as it advertises L0s
> > > > and L1 capabilities without supporting it.
> > > > 
> > > > Override the L0s and L1 Support advertised in Link Capabilities by the
> > > > SG2042/SG2044 Root Ports so we don't try to enable those states.
> > > > 
> > > > Inochi Amaoto (2):
> > > >   PCI/ASPM: Avoid L0s and L1 on Sophgo 2042 PCIe [1f1c:2042] Root Ports
> > > >   PCI/ASPM: Avoid L0s and L1 on Sophgo 2044 PCIe [1f1c:2044] Root Ports
> > > > 
> > > >  drivers/pci/quirks.c    | 2 ++
> > > >  include/linux/pci_ids.h | 2 ++
> > > >  2 files changed, 4 insertions(+)
> > > 
> > > 1) Can somebody at Sophgo confirm that this is a hardware erratum?  I
> > > just want to make rule out some kind of OS bug in configuring L0s/L1.
> > > 
> > 
> > Hi Bjorn,
> > 
> > I have asked for the Sophgo staff, and they already confirmed this 
> > hardware errata.
> > 
> 
> Okay. If the hardware (Root Port) doesn't support L0s and L1, you should disable
> the capability in the sophgo controller driver instead. You can use this as a
> reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/pci/controller/dwc/pcie-qcom.c#n331
> 
> Quirks is mostly meant for PCI endpoint devices (sometimes Root Ports also if
> there is no host controller driver).
> 
> - Mani
> 

Good to know, I will switch to quirks, thanks.

Regards,
Inochi