linux-kernel - Re: [PATCH v1 1/2] PCI: dw-rockchip: Add remove callback for resource cleanup

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Message-ID: <4fe0ccf9-8866-443a-8083-4a2af7035ee6@rock-chips.com>
Date: Tue, 28 Oct 2025 08:26:05 +0800
From: Shawn Lin <shawn.lin@...k-chips.com>
To: Anand Moon <linux.amoon@...il.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Heiko Stuebner <heiko@...ech.de>,
 Niklas Cassel <cassel@...nel.org>, Hans Zhang <18255117159@....com>,
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>,
 "open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS"
 <linux-pci@...r.kernel.org>,
 "moderated list:ARM/Rockchip SoC support"
 <linux-arm-kernel@...ts.infradead.org>,
 "open list:ARM/Rockchip SoC support" <linux-rockchip@...ts.infradead.org>,
 open list <linux-kernel@...r.kernel.org>
Cc: shawn.lin@...k-chips.com
Subject: Re: [PATCH v1 1/2] PCI: dw-rockchip: Add remove callback for resource
 cleanup

在 2025/10/27 星期一 22:55, Anand Moon 写道:
> Introduce a .remove() callback to the Rockchip DesignWare PCIe
> controller driver to ensure proper resource deinitialization during
> device removal. This includes disabling clocks and deinitializing the
> PCIe PHY.
> 
> Signed-off-by: Anand Moon <linux.amoon@...il.com>
> ---
>   drivers/pci/controller/dwc/pcie-dw-rockchip.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> index 87dd2dd188b4..b878ae8e2b3e 100644
> --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> @@ -717,6 +717,16 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>   	return ret;
>   }
>   
> +static void rockchip_pcie_remove(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct rockchip_pcie *rockchip = dev_get_drvdata(dev);
> +
> +	/* Perform other cleanups as necessary */
> +	clk_bulk_disable_unprepare(rockchip->clk_cnt, rockchip->clks);
> +	rockchip_pcie_phy_deinit(rockchip);
> +}

Thanks for the patch.

Dou you need to call dw_pcie_host_deinit()?
And I think you should also try to mask PCIE_CLIENT_INTR_MASK_MISC and
remove the irq domain as well.

if (rockchip->irq_domain) {
	int virq, j;
	for (j = 0; j < PCI_NUM_INTX; j++) {
		virq = irq_find_mapping(rockchip->irq_domain, j);
		if (virq > 0)
			irq_dispose_mapping(virq);
         }
	irq_set_chained_handler_and_data(rockchip->irq, NULL, NULL);
	irq_domain_remove(rockchip->irq_domain);
}

Another thin I noticed is should we call pm_runtime_* here for hope that
genpd could be powered donw once removed?


> +
>   static const struct rockchip_pcie_of_data rockchip_pcie_rc_of_data_rk3568 = {
>   	.mode = DW_PCIE_RC_TYPE,
>   };
> @@ -754,5 +764,6 @@ static struct platform_driver rockchip_pcie_driver = {
>   		.suppress_bind_attrs = true,
>   	},
>   	.probe = rockchip_pcie_probe,
> +	.remove = rockchip_pcie_remove,
>   };
>   builtin_platform_driver(rockchip_pcie_driver);