linux-kernel - Re: [PATCH v2] PCI: dwc: Provide deinit callback for i.MX

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Date:   Wed, 12 Jul 2023 21:00:03 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Richard Zhu <hongxing.zhu@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] PCI: dwc: Provide deinit callback for i.MX

On Wed, Jul 12, 2023 at 12:02:57PM +0100, Mark Brown wrote:
> The i.MX integration for the DesignWare PCI controller has a _host_exit()
> operation which undoes everything that the _host_init() operation does but
> does not wire this up as the host_deinit callback for the core, or call it
> in any path other than suspend. This means that if we ever unwind the
> initial probe of the device, for example because it fails, the regulator
> core complains that the regulators for the device were left enabled:
> 
> imx6q-pcie 33800000.pcie: iATU: unroll T, 4 ob, 4 ib, align 64K, limit 16G
> imx6q-pcie 33800000.pcie: Phy link never came up
> imx6q-pcie 33800000.pcie: Phy link never came up
> imx6q-pcie: probe of 33800000.pcie failed with error -110
> ------------[ cut here ]------------
> WARNING: CPU: 2 PID: 46 at drivers/regulator/core.c:2396 _regulator_put+0x110/0x128
> 
> Wire up the callback so that the core can clean up after itself.
> 
> Reviewed-by: Richard Zhu <hongxing.zhu@....com>
> Tested-by: Fabio Estevam <festevam@...il.com>
> Signed-off-by: Mark Brown <broonie@...nel.org>

Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

- Mani

> ---
> Changes in v2:
> - Rebase onto v6.5-rc1.
> - Link to v1: https://lore.kernel.org/r/20230703-pci-imx-regulator-cleanup-v1-1-b6c050ae2bad@kernel.org
> ---
>  drivers/pci/controller/dwc/pci-imx6.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 27aaa2a6bf39..a18c20085e94 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1040,6 +1040,7 @@ static void imx6_pcie_host_exit(struct dw_pcie_rp *pp)
>  
>  static const struct dw_pcie_host_ops imx6_pcie_host_ops = {
>  	.host_init = imx6_pcie_host_init,
> +	.host_deinit = imx6_pcie_host_exit,
>  };
>  
>  static const struct dw_pcie_ops dw_pcie_ops = {
> 
> ---
> base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
> change-id: 20230703-pci-imx-regulator-cleanup-a17c8fd15ec5
> 
> Best regards,
> -- 
> Mark Brown <broonie@...nel.org>
> 

-- 
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