linux-kernel - Re: [PATCH v4] pci: dwc: dra7xx: Add shutdown handler to cleanly turn off clocks

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Message-ID: <20171011193207.GO25517@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 11 Oct 2017 14:32:07 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Keerthy <j-keerthy@...com>
Cc:     kishon@...com, bhelgaas@...gle.com, t-kristo@...com,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v4] pci: dwc: dra7xx: Add shutdown handler to cleanly
 turn off clocks

On Wed, Sep 20, 2017 at 10:54:15AM +0530, Keerthy wrote:
> Add shutdown handler to cleanly turn off clocks. This will help
> in cases of kexec where in a new kernel can boot abruptly.
> 
> Signed-off-by: Keerthy <j-keerthy@...com>
> Acked-by: Kishon Vijay Abraham I <kishon@...com>

Applied to pci/host-dra7xx for v4.15, thanks!

> ---
> 
> Changes in v4:
> 
>   * Added the missing changes from v2!
> 
> Changes in v3:
> 
>   * Pushed the function outside #ifdef CONFIG_PM_SLEEP.
>   * Added more details to commit log.
> 
> Changes in v2:
> 
>   * used a local dev pointer instead of dereferencing dev at multiple places.
>   * dra7xx_pcie_stop_link before disabling clks in the shutdown path.
> 
>  drivers/pci/dwc/pci-dra7xx.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
> index 34427a6..d084800 100644
> --- a/drivers/pci/dwc/pci-dra7xx.c
> +++ b/drivers/pci/dwc/pci-dra7xx.c
> @@ -794,6 +794,22 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
>  }
>  #endif
>  
> +void dra7xx_pcie_shutdown(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct dra7xx_pcie *dra7xx = dev_get_drvdata(dev);
> +	int ret;
> +
> +	dra7xx_pcie_stop_link(dra7xx->pci);
> +
> +	ret = pm_runtime_put_sync(dev);
> +	if (ret < 0)
> +		dev_dbg(dev, "pm_runtime_put_sync failed\n");
> +
> +	pm_runtime_disable(dev);
> +	dra7xx_pcie_disable_phy(dra7xx);
> +}
> +
>  static const struct dev_pm_ops dra7xx_pcie_pm_ops = {
>  	SET_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend, dra7xx_pcie_resume)
>  	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(dra7xx_pcie_suspend_noirq,
> @@ -807,5 +823,6 @@ static int dra7xx_pcie_resume_noirq(struct device *dev)
>  		.suppress_bind_attrs = true,
>  		.pm	= &dra7xx_pcie_pm_ops,
>  	},
> +	.shutdown = dra7xx_pcie_shutdown,
>  };
>  builtin_platform_driver_probe(dra7xx_pcie_driver, dra7xx_pcie_probe);
> -- 
> 1.9.1
>