linux-kernel - Re: [PATCH] PCI / PM: Drop unused runtime PM support code for PCIe ports

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Date:	Tue, 2 Sep 2014 17:15:51 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux PCI <linux-pci@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH] PCI / PM: Drop unused runtime PM support code for PCIe
 ports

On Mon, Jul 21, 2014 at 02:02:23AM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> 
> Since commit de7d5f729c72 (PCI/PM: Disable runtime PM of PCIe ports)
> the runtime PM support code for PCIe ports in portdrv_pci.c has never
> been used, so drop it entirely.
> 
> If we are to support runtime PM of PCIe ports, it will have to be
> done in a different way most likely anyway.
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Applied to pci/pm for v3.18, thanks!

> ---
>  drivers/pci/pcie/portdrv_pci.c |   74 -----------------------------------------
>  1 file changed, 74 deletions(-)
> 
> Index: linux-pm/drivers/pci/pcie/portdrv_pci.c
> ===================================================================
> --- linux-pm.orig/drivers/pci/pcie/portdrv_pci.c
> +++ linux-pm/drivers/pci/pcie/portdrv_pci.c
> @@ -93,77 +93,6 @@ static int pcie_port_resume_noirq(struct
>  	return 0;
>  }
>  
> -#ifdef CONFIG_PM_RUNTIME
> -struct d3cold_info {
> -	bool no_d3cold;
> -	unsigned int d3cold_delay;
> -};
> -
> -static int pci_dev_d3cold_info(struct pci_dev *pdev, void *data)
> -{
> -	struct d3cold_info *info = data;
> -
> -	info->d3cold_delay = max_t(unsigned int, pdev->d3cold_delay,
> -				   info->d3cold_delay);
> -	if (pdev->no_d3cold)
> -		info->no_d3cold = true;
> -	return 0;
> -}
> -
> -static int pcie_port_runtime_suspend(struct device *dev)
> -{
> -	struct pci_dev *pdev = to_pci_dev(dev);
> -	struct d3cold_info d3cold_info = {
> -		.no_d3cold	= false,
> -		.d3cold_delay	= PCI_PM_D3_WAIT,
> -	};
> -
> -	/*
> -	 * If any subordinate device disable D3cold, we should not put
> -	 * the port into D3cold.  The D3cold delay of port should be
> -	 * the max of that of all subordinate devices.
> -	 */
> -	pci_walk_bus(pdev->subordinate, pci_dev_d3cold_info, &d3cold_info);
> -	pdev->no_d3cold = d3cold_info.no_d3cold;
> -	pdev->d3cold_delay = d3cold_info.d3cold_delay;
> -	return 0;
> -}
> -
> -static int pcie_port_runtime_resume(struct device *dev)
> -{
> -	return 0;
> -}
> -
> -static int pci_dev_pme_poll(struct pci_dev *pdev, void *data)
> -{
> -	bool *pme_poll = data;
> -
> -	if (pdev->pme_poll)
> -		*pme_poll = true;
> -	return 0;
> -}
> -
> -static int pcie_port_runtime_idle(struct device *dev)
> -{
> -	struct pci_dev *pdev = to_pci_dev(dev);
> -	bool pme_poll = false;
> -
> -	/*
> -	 * If any subordinate device needs pme poll, we should keep
> -	 * the port in D0, because we need port in D0 to poll it.
> -	 */
> -	pci_walk_bus(pdev->subordinate, pci_dev_pme_poll, &pme_poll);
> -	/* Delay for a short while to prevent too frequent suspend/resume */
> -	if (!pme_poll)
> -		pm_schedule_suspend(dev, 10);
> -	return -EBUSY;
> -}
> -#else
> -#define pcie_port_runtime_suspend	NULL
> -#define pcie_port_runtime_resume	NULL
> -#define pcie_port_runtime_idle		NULL
> -#endif
> -
>  static const struct dev_pm_ops pcie_portdrv_pm_ops = {
>  	.suspend	= pcie_port_device_suspend,
>  	.resume		= pcie_port_device_resume,
> @@ -172,9 +101,6 @@ static const struct dev_pm_ops pcie_port
>  	.poweroff	= pcie_port_device_suspend,
>  	.restore	= pcie_port_device_resume,
>  	.resume_noirq	= pcie_port_resume_noirq,
> -	.runtime_suspend = pcie_port_runtime_suspend,
> -	.runtime_resume = pcie_port_runtime_resume,
> -	.runtime_idle	= pcie_port_runtime_idle,
>  };
>  
>  #define PCIE_PORTDRV_PM_OPS	(&pcie_portdrv_pm_ops)
> 
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