Re: [PATCH v6 7/8] PCI: qcom: Fix the cfg for X1E80100 SoC

[Manivannan Sadhasivam]

On Fri, Oct 11, 2024 at 03:41:41AM -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 and it is

"...connected to SMMUv3, hence doesn't need config_sid() callback"

> recommended to disable ASPM L0s. Hence reuse cfg_sc8280xp for X1E80100.

"...and hardware team has recommended to disable L0s as it is broken in the
controller."

> 
> Fixes: 6d0c39324c5f ("PCI: qcom: Add X1E80100 PCIe support")
> Signed-off-by: Qiang Yu <quic_qianyu@xxxxxxxxxxx>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>

We need to backport this patch to stable to fix the L0s handling. But we don't
need the previous patch as even without that cfg_sc8280xp disables L0s.

- Mani

> ---
>  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
> 

-- 
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