linux-kernel - Re: [PATCH v4 3/5] PCI: qcom: Disable ASPM L0s for sc8280xp, sa8540p and sa8295p

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Message-ID: <5o5vbnxfsiokjf2ahrppr26oyuqhwhdos3374r3zpexunhc5j7@yquaupvfywbz>
Date: Sun, 17 Mar 2024 20:24:06 -0500
From: Bjorn Andersson <andersson@...nel.org>
To: Johan Hovold <johan+linaro@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, 
	Konrad Dybcio <konrad.dybcio@...aro.org>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kw@...ux.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v4 3/5] PCI: qcom: Disable ASPM L0s for sc8280xp, sa8540p
 and sa8295p

On Wed, Mar 06, 2024 at 10:56:49AM +0100, Johan Hovold wrote:
> Commit 9f4f3dfad8cf ("PCI: qcom: Enable ASPM for platforms supporting
> 1.9.0 ops") started enabling ASPM unconditionally when the hardware
> claims to support it. This triggers Correctable Errors for some PCIe
> devices on machines like the Lenovo ThinkPad X13s when L0s is enabled,
> which could indicate an incomplete driver ASPM implementation or that
> the hardware does in fact not support L0s.
> 
> This has now been confirmed by Qualcomm to be the case for sc8280xp and
> its derivate platforms (e.g. sa8540p and sa8295p). Specifically, the PHY
> configuration used on these platforms is not correctly tuned for L0s and
> there is currently no updated configuration available.
> 
> Add a new flag to the driver configuration data and use it to disable
> ASPM L0s on sc8280xp, sa8540p and sa8295p for now.
> 
> Note that only the 1.9.0 ops enable ASPM currently.
> 
> Fixes: 9f4f3dfad8cf ("PCI: qcom: Enable ASPM for platforms supporting 1.9.0 ops")
> Cc: stable@...r.kernel.org      # 6.7
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>

Reviewed-by: Bjorn Andersson <andersson@...nel.org>

Regards,
Bjorn