linux-kernel - Re: [PATCH v7 3/7] PCI: qcom: Add ICC bandwidth vote for CPU to PCIe path

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Date: Sat, 24 Feb 2024 01:02:03 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Krishna chaitanya chundru <quic_krichai@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
 Rob Herring <robh+dt@...nel.org>, Johan Hovold <johan+linaro@...nel.org>,
 Brian Masney <bmasney@...hat.com>, Georgi Djakov <djakov@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 vireshk@...nel.org, quic_vbadigan@...cinc.com, quic_skananth@...cinc.com,
 quic_nitegupt@...cinc.com, quic_parass@...cinc.com,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v7 3/7] PCI: qcom: Add ICC bandwidth vote for CPU to PCIe
 path

On 23.02.2024 15:48, Krishna chaitanya chundru wrote:
> To access PCIe registers, PCIe BAR space, config space the CPU-PCIe
> ICC(interconnect consumers) path should be voted otherwise it may
> lead to NoC(Network on chip) timeout. We are surviving because of
> other driver vote for this path.
> As there is less access on this path compared to PCIe to mem path
> add minimum vote i.e 1KBps bandwidth always.
> 
> In suspend remove the disable this path after register space access
> is done.
> 
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Krishna chaitanya chundru <quic_krichai@...cinc.com>
> ---

[...]

>  
> +	/* Remove cpu path vote after all the register access is done */
> +	ret = icc_disable(pcie->icc_cpu);
> +	if (ret) {
> +		dev_err(dev, "failed to disable icc path of cpu-pcie: %d\n", ret);
> +		if (pcie->suspended) {
> +			qcom_pcie_host_init(&pcie->pci->pp);
> +			pcie->suspended = false;
> +		}
> +		qcom_pcie_icc_opp_update(pcie);

This doesn't compile (you rename it in patch 6, this is patch 3)

Konrad