linux-kernel - Re: [PATCH v4 5/6] PCI: qcom: Add support for X1E80100 SoC

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Message-ID: <20240924135021.ybpyoahlpuvedma5@thinkpad>
Date: Tue, 24 Sep 2024 15:50:21 +0200
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Qiang Yu <quic_qianyu@...cinc.com>
Cc: 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
Subject: Re: [PATCH v4 5/6] PCI: qcom: Add support for X1E80100 SoC

On Tue, Sep 24, 2024 at 03:14:43AM -0700, Qiang Yu wrote:
> X1E80100 has PCIe ports that support up to Gen4 x8 based on hardware IP
> version 1.38.0.
> 
> Currently the ops_1_9_0 which is being used for X1E80100 has config_sid
> callback to config BDF to SID table. However, this callback is not
> required for X1E80100 because it has smmuv3 support and BDF to SID table
> will be not present.
> 
> Hence add support for X1E80100 by introducing a new ops and cfg structures
> that don't require the config_sid callback. This could be reused by the
> future platforms based on SMMUv3.
> 

Oops... I completely overlooked that you are not adding the SoC support but
fixing the existing one :( Sorry for suggesting a commit message that changed
the context.

For this, you can have something like:

"PCI: qcom: Fix the ops for X1E80100 SoC

X1E80100 SoC is based on SMMUv3, hence it doesn't need the BDF2SID mapping
present in the existing cfg_1_9_0 ops. This is fixed by introducing new ops
'ops_1_38_0' and cfg 'cfg_1_38_0' structures. These are exactly same as the
1_9_0 ones, but they don't have the 'config_sid()' callback that handles the
BDF2SID mapping in the hardware. These new structures could also be used by the
future SoCs making use of SMMUv3."

- Mani

> Signed-off-by: Qiang Yu <quic_qianyu@...cinc.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 88a98be930e3..56ba8bc72f78 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1367,6 +1367,16 @@ static const struct qcom_pcie_ops ops_2_9_0 = {
>  	.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
>  };
>  
> +/* Qcom IP rev.: 1.38.0 */
> +static const struct qcom_pcie_ops ops_1_38_0 = {
> +	.get_resources = qcom_pcie_get_resources_2_7_0,
> +	.init = qcom_pcie_init_2_7_0,
> +	.post_init = qcom_pcie_post_init_2_7_0,
> +	.host_post_init = qcom_pcie_host_post_init_2_7_0,
> +	.deinit = qcom_pcie_deinit_2_7_0,
> +	.ltssm_enable = qcom_pcie_2_3_2_ltssm_enable,
> +};
> +
>  static const struct qcom_pcie_cfg cfg_1_0_0 = {
>  	.ops = &ops_1_0_0,
>  };
> @@ -1409,6 +1419,10 @@ static const struct qcom_pcie_cfg cfg_sc8280xp = {
>  	.no_l0s = true,
>  };
>  
> +static const struct qcom_pcie_cfg cfg_1_38_0 = {
> +	.ops = &ops_1_38_0,
> +};
> +
>  static const struct dw_pcie_ops dw_pcie_ops = {
>  	.link_up = qcom_pcie_link_up,
>  	.start_link = qcom_pcie_start_link,
> @@ -1837,7 +1851,7 @@ 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_1_38_0 },
>  	{ }
>  };
>  
> -- 
> 2.34.1
> 

-- 
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