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

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Message-ID: <3f454d6f-b40e-49e5-89eb-b77bcca35043@quicinc.com>
Date: Wed, 25 Sep 2024 11:44:51 +0800
From: Qiang Yu <quic_qianyu@...cinc.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
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 9/24/2024 9:50 PM, Manivannan Sadhasivam wrote:
> 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."
Never mind, thanks for your suggestions. Will update the commit msg in next
version.

Thanks,
Qiang Yu
>
> - 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
>>