linux-kernel - Re: [PATCH v7 6/7] PCI: qcom: Disable ASPM L0s and remove BDF2SID mapping config for X1E80100 SoC

Open Source and information security mailing list archives

Message-ID: <ZxJvxvxlHuQ9Zze5@hu-bjorande-lv.qualcomm.com>
Date: Fri, 18 Oct 2024 07:25:10 -0700
From: Bjorn Andersson <bjorn.andersson@....qualcomm.com>
To: Qiang Yu <quic_qianyu@...cinc.com>
Cc: manivannan.sadhasivam@...aro.org, vkoul@...nel.org, kishon@...nel.org,
        robh@...nel.org, andersson@...nel.org, konradybcio@...nel.org,
        krzk+dt@...nel.org, conor+dt@...nel.org, mturquette@...libre.com,
        sboyd@...nel.org, abel.vesa@...aro.org, quic_msarkar@...cinc.com,
        quic_devipriy@...cinc.com, dmitry.baryshkov@...aro.org, kw@...ux.com,
        lpieralisi@...nel.org, neil.armstrong@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        johan+linaro@...nel.org, stable@...r.kernel.org
Subject: Re: [PATCH v7 6/7] PCI: qcom: Disable ASPM L0s and remove BDF2SID
 mapping config for X1E80100 SoC

On Wed, Oct 16, 2024 at 08:04:11PM -0700, Qiang Yu wrote:
> Currently, the cfg_1_9_0 which is being used for X1E80100 has config_sid
> callback in its ops and doesn't disable ASPM L0s. However, as same as
> SC8280X, PCIe controllers on X1E80100 are connected to SMMUv3, hence don't

Would be nice to document the connection between SMMUv3 and "don't need
config_sid()" is because we don't have support for the SMMUv3.

> need config_sid() callback and hardware team has recommended to disable
> L0s as it is broken in the controller. Hence reuse cfg_sc8280xp for

I expect that config_sid() and "disable L0s" are two separate issues.
I'm fine with you solving both in a single commit, but I'd prefer the
two subjects to be covered in at least two separate sentences.

Regards,
Bjorn

> X1E80100.
> 
> Fixes: 6d0c39324c5f ("PCI: qcom: Add X1E80100 PCIe support")
> Cc: stable@...r.kernel.org
> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 468bd4242e61..c533e6024ba2 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1847,7 +1847,7 @@ static const struct of_device_id qcom_pcie_match[] = {
>  	{ .compatible = "qcom,pcie-sm8450-pcie0", .data = &cfg_1_9_0 },
>  	{ .compatible = "qcom,pcie-sm8450-pcie1", .data = &cfg_1_9_0 },
>  	{ .compatible = "qcom,pcie-sm8550", .data = &cfg_1_9_0 },
> -	{ .compatible = "qcom,pcie-x1e80100", .data = &cfg_1_9_0 },
> +	{ .compatible = "qcom,pcie-x1e80100", .data = &cfg_sc8280xp },
>  	{ }
>  };
>  
> -- 
> 2.34.1
> 
> 
> -- 
> linux-phy mailing list
> linux-phy@...ts.infradead.org
> https://lists.infradead.org/mailman/listinfo/linux-phy

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives