linux-kernel - Re: [PATCH v5 3/3] PCI: qcom-ep: Add ICC bandwidth voting support

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Date:   Wed, 28 Jun 2023 07:51:23 +0530
From:   Krishna Chaitanya Chundru <quic_krichai@...cinc.com>
To:     Pavan Kondeti <quic_pkondeti@...cinc.com>
CC:     <manivannan.sadhasivam@...aro.org>, <helgaas@...nel.org>,
        <linux-pci@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_vbadigan@...cinc.com>,
        <quic_nitegupt@...cinc.com>, <quic_skananth@...cinc.com>,
        <quic_ramkri@...cinc.com>, <krzysztof.kozlowski@...aro.org>,
        "Manivannan Sadhasivam" <mani@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v5 3/3] PCI: qcom-ep: Add ICC bandwidth voting support


On 6/27/2023 12:05 PM, Pavan Kondeti wrote:
> On Tue, Jun 27, 2023 at 06:31:31AM +0530, Krishna chaitanya chundru wrote:
>> +static void qcom_pcie_ep_icc_update(struct qcom_pcie_ep *pcie_ep)
>> +{
>> +	struct dw_pcie *pci = &pcie_ep->pci;
>> +	u32 offset, status, bw;
>> +	int speed, width;
>> +	int ret;
>> +
>> +	if (!pcie_ep->icc_mem)
>> +		return;
>> +
> Is this check needed? interconnect is added as required property and
> probe is failed if interconnect get fails. qcom_pcie_enable_resources()
> which gets called before enabling this interrupt is assuming that
> interconnect available.
>
>
>> +	offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
>> +	status = readw(pci->dbi_base + offset + PCI_EXP_LNKSTA);
>> +
>> +	speed = FIELD_GET(PCI_EXP_LNKSTA_CLS, status);
>> +	width = FIELD_GET(PCI_EXP_LNKSTA_NLW, status);
>> +
>> +	switch (speed) {
>> +	case 1:
>> +		bw = MBps_to_icc(PCIE_GEN1_BW_MBPS);
>> +		break;
>> +	case 2:
>> +		bw = MBps_to_icc(PCIE_GEN2_BW_MBPS);
>> +		break;
>> +	case 3:
>> +		bw = MBps_to_icc(PCIE_GEN3_BW_MBPS);
>> +		break;
>> +	default:
>> +		dev_warn(pci->dev, "using default GEN4 bandwidth\n");
>> +		fallthrough;
>> +	case 4:
>> +		bw = MBps_to_icc(PCIE_GEN4_BW_MBPS);
>> +		break;
>> +	}
>> +
>> +	ret = icc_set_bw(pcie_ep->icc_mem, 0, width * bw);
>> +	if (ret) {
>> +		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
>> +			ret);
>> +	}
> Are you not seeing the below warning from checkpatch?
>
> WARNING: braces {} are not necessary for single statement blocks

checkpatch is not giving warnings for this.

I removed the braces.

-KC

>> +}
>> +
>>   static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep)
>>   {
>>   	int ret;
>> +	struct dw_pcie *pci = &pcie_ep->pci;
>>   
>>   	ret = clk_bulk_prepare_enable(pcie_ep->num_clks, pcie_ep->clks);
>>   	if (ret)
>> @@ -277,6 +331,20 @@ static int qcom_pcie_enable_resources(struct qcom_pcie_ep *pcie_ep)
>>   	if (ret)
>>   		goto err_phy_exit;
>>   
>> +	/*
>> +	 * Some Qualcomm platforms require interconnect bandwidth constraints
>> +	 * to be set before enabling interconnect clocks.
>> +	 *
>> +	 * Set an initial peak bandwidth corresponding to single-lane Gen 1
>> +	 * for the pcie-mem path.
>> +	 */
>> +	ret = icc_set_bw(pcie_ep->icc_mem, 0, MBps_to_icc(PCIE_GEN1_BW_MBPS));
>> +	if (ret) {
>> +		dev_err(pci->dev, "failed to set interconnect bandwidth: %d\n",
>> +			ret);
>> +		goto err_phy_exit;
>> +	}
>> +
>>   	return 0;
> Thanks,
> Pavan