Re: [PATCH v5 3/3] PCI: qcom: Implement shutdown() callback

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 9/5/26 2:48 AM, Krishna Chaitanya Chundru wrote:
> From: Manivannan Sadhasivam <mani@kernel.org>
> 
> PCIe host controllers should bring the link down cleanly before system
> shutdown/reboot proceeds to remove power/clocks from the controller.
> Without this, the link may still be up and endpoints still have
> transactions in flight when power/clocks are cut, which can trip SMMU
> translation faults or NoC protocol errors.

[...]

> +static void qcom_pcie_shutdown(struct platform_device *pdev)
> +{
> +	const struct qcom_pcie_cfg *pcie_cfg = of_device_get_match_data(&pdev->dev);
> +	struct qcom_pcie *pcie;
> +
> +	if (pcie_cfg && pcie_cfg->firmware_managed) {
> +		/*
> +		 * Firmware owns the link teardown and clock/PHY shutdown in
> +		 * this mode; Linux only owns the chained MSI IRQ(s), which
> +		 * still need to be masked off before shutdown proceeds.
> +		 */
> +		struct dw_pcie *pci = platform_get_drvdata(pdev);
> +
> +		if (pci->pp.use_imsi_rx)
> +			dw_pcie_free_msi(&pci->pp);
> +		return;
> +	}
> +
> +	pcie = platform_get_drvdata(pdev);
> +	if (pcie) {
> +		if (pcie->pci->pp.use_imsi_rx)
> +			dw_pcie_free_msi(&pcie->pci->pp);
> +
> +		if (pcie->global_irq)
> +			disable_irq(pcie->global_irq);
> +
> +		pcie->pci->pp.force_d3cold = true;
> +		dw_pcie_suspend_noirq(pcie->pci);
> +	}
> +

if (!pcie)
	return/warn (should it be possible?)

if (pci->pp.use_imsi_rx)
	dw_pcie_free_msi(&pci->pp);

/* abc xyz */
if (firwmare_managed)
	return;

will save you indentation and de-duplicate the free_msi() call

Konrad