3c59x: Rework suspend and resume

As noticed by Alan Stern, there is still one issue with the driver:
we disable PCI IRQ on suspend, but other devices on the same IRQ
line might still need the IRQ enabled to suspend properly.

Nowadays, PCI core handles all power management work by itself, with
one condition though: if we use dev_pm_ops. So, rework the driver to
only quiesce 3c59x internal logic on suspend, while PCI core will
manage PCI device power state with IRQs disabled.

Suggested-by: Rafael J. Wysocki <rjw@sisk.pl>
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
---
 drivers/net/3c59x.c |   77 +++++++++++++++++++++++++--------------------------
 1 files changed, 38 insertions(+), 39 deletions(-)

On Friday 25 September 2009, Anton Vorontsov wrote:
> As noticed by Alan Stern, there is still one issue with the driver:
> we disable PCI IRQ on suspend, but other devices on the same IRQ
> line might still need the IRQ enabled to suspend properly.
> 
> Nowadays, PCI core handles all power management work by itself, with
> one condition though: if we use dev_pm_ops. So, rework the driver to
> only quiesce 3c59x internal logic on suspend, while PCI core will
> manage PCI device power state with IRQs disabled.
> 
> Suggested-by: Rafael J. Wysocki <rjw@sisk.pl>

Acked-by: Rafael J. Wysocki <rjw@sisk.pl>

> Suggested-by: Alan Stern <stern@rowland.harvard.edu>
> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
> ---
>  drivers/net/3c59x.c |   77 +++++++++++++++++++++++++--------------------------
>  1 files changed, 38 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c
> index 7cdd4b0..dee2320 100644
> --- a/drivers/net/3c59x.c
> +++ b/drivers/net/3c59x.c
> @@ -799,52 +799,54 @@ static void poll_vortex(struct net_device *dev)
>  
>  #ifdef CONFIG_PM
>  
> -static int vortex_suspend(struct pci_dev *pdev, pm_message_t state)
> +static int vortex_suspend(struct device *dev)
>  {
> -	struct net_device *dev = pci_get_drvdata(pdev);
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +	struct net_device *ndev = pci_get_drvdata(pdev);
> +
> +	if (!ndev || !netif_running(ndev))
> +		return 0;
> +
> +	netif_device_detach(ndev);
> +	vortex_down(ndev, 1);
>  
> -	if (dev && netdev_priv(dev)) {
> -		if (netif_running(dev)) {
> -			netif_device_detach(dev);
> -			vortex_down(dev, 1);
> -			disable_irq(dev->irq);
> -		}
> -		pci_save_state(pdev);
> -		pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
> -		pci_disable_device(pdev);
> -		pci_set_power_state(pdev, pci_choose_state(pdev, state));
> -	}
>  	return 0;
>  }
>  
> -static int vortex_resume(struct pci_dev *pdev)
> +static int vortex_resume(struct device *dev)
>  {
> -	struct net_device *dev = pci_get_drvdata(pdev);
> -	struct vortex_private *vp = netdev_priv(dev);
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +	struct net_device *ndev = pci_get_drvdata(pdev);
>  	int err;
>  
> -	if (dev && vp) {
> -		pci_set_power_state(pdev, PCI_D0);
> -		pci_restore_state(pdev);
> -		err = pci_enable_device(pdev);
> -		if (err) {
> -			pr_warning("%s: Could not enable device\n",
> -				dev->name);
> -			return err;
> -		}
> -		pci_set_master(pdev);
> -		if (netif_running(dev)) {
> -			err = vortex_up(dev);
> -			if (err)
> -				return err;
> -			enable_irq(dev->irq);
> -			netif_device_attach(dev);
> -		}
> -	}
> +	if (!ndev || !netif_running(ndev))
> +		return 0;
> +
> +	err = vortex_up(ndev);
> +	if (err)
> +		return err;
> +
> +	netif_device_attach(ndev);
> +
>  	return 0;
>  }
>  
> -#endif /* CONFIG_PM */
> +static struct dev_pm_ops vortex_pm_ops = {
> +	.suspend = vortex_suspend,
> +	.resume = vortex_resume,
> +	.freeze = vortex_suspend,
> +	.thaw = vortex_resume,
> +	.poweroff = vortex_suspend,
> +	.restore = vortex_resume,
> +};
> +
> +#define VORTEX_PM_OPS (&vortex_pm_ops)
> +
> +#else /* !CONFIG_PM */
> +
> +#define VORTEX_PM_OPS NULL
> +
> +#endif /* !CONFIG_PM */
>  
>  #ifdef CONFIG_EISA
>  static struct eisa_device_id vortex_eisa_ids[] = {
> @@ -3191,10 +3193,7 @@ static struct pci_driver vortex_driver = {
>  	.probe		= vortex_init_one,
>  	.remove		= __devexit_p(vortex_remove_one),
>  	.id_table	= vortex_pci_tbl,
> -#ifdef CONFIG_PM
> -	.suspend	= vortex_suspend,
> -	.resume		= vortex_resume,
> -#endif
> +	.driver.pm	= VORTEX_PM_OPS,
>  };

Thanks,
Rafael
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From: "Rafael J. Wysocki" <rjw@sisk.pl>
Date: Fri, 25 Sep 2009 23:54:34 +0200

> On Friday 25 September 2009, Anton Vorontsov wrote:
>> As noticed by Alan Stern, there is still one issue with the driver:
>> we disable PCI IRQ on suspend, but other devices on the same IRQ
>> line might still need the IRQ enabled to suspend properly.
>> 
>> Nowadays, PCI core handles all power management work by itself, with
>> one condition though: if we use dev_pm_ops. So, rework the driver to
>> only quiesce 3c59x internal logic on suspend, while PCI core will
>> manage PCI device power state with IRQs disabled.
>> 
>> Suggested-by: Rafael J. Wysocki <rjw@sisk.pl>
> 
> Acked-by: Rafael J. Wysocki <rjw@sisk.pl>

Applied, thanks everyone.
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