netdev - Re: [PATCH v2 06/11] sundance: use generic power management

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Date:   Wed, 8 Jul 2020 13:43:15 +0300
From:   Denis Kirjanov <kda@...ux-powerpc.org>
To:     Vaibhav Gupta <vaibhavgupta40@...il.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, bjorn@...gaas.com,
        Vaibhav Gupta <vaibhav.varodek@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        David Dillow <dave@...dillows.org>,
        Ion Badulescu <ionut@...ula.org>,
        Netanel Belgazal <netanel@...zon.com>,
        Arthur Kiyanovski <akiyano@...zon.com>,
        Guy Tzalik <gtzalik@...zon.com>,
        Saeed Bishara <saeedb@...zon.com>,
        Zorik Machulsky <zorik@...zon.com>,
        Derek Chickles <dchickles@...vell.com>,
        Satanand Burla <sburla@...vell.com>,
        Felix Manlunas <fmanlunas@...vell.com>,
        Ajit Khaparde <ajit.khaparde@...adcom.com>,
        Sriharsha Basavapatna <sriharsha.basavapatna@...adcom.com>,
        Somnath Kotur <somnath.kotur@...adcom.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Jon Mason <jdmason@...zu.us>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        skhan@...uxfoundation.org
Subject: Re: [PATCH v2 06/11] sundance: use generic power management

On 7/3/20, Denis Kirjanov <kda@...ux-powerpc.org> wrote:
> On 7/1/20, Vaibhav Gupta <vaibhavgupta40@...il.com> wrote:
>> With legacy PM, drivers themselves were responsible for managing the
>> device's power states and takes care of register states.
>>
>> After upgrading to the generic structure, PCI core will take care of
>> required tasks and drivers should do only device-specific operations.
>>
>> Thus, there is no need to call the PCI helper functions like
>> pci_enable/disable_device(), pci_save/restore_sate() and
>> pci_set_power_state().
>>
>> Compile-tested only.
>>
>> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
>
> Should be fine. I'll try to test it in the upcoming weekend

Unfortunately the suspend mode is broken on my test machine so I will
take some time :/

>
>> ---
>>  drivers/net/ethernet/dlink/sundance.c | 27 ++++++++-------------------
>>  1 file changed, 8 insertions(+), 19 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/dlink/sundance.c
>> b/drivers/net/ethernet/dlink/sundance.c
>> index dc566fcc3ba9..ca97e321082d 100644
>> --- a/drivers/net/ethernet/dlink/sundance.c
>> +++ b/drivers/net/ethernet/dlink/sundance.c
>> @@ -1928,11 +1928,9 @@ static void sundance_remove1(struct pci_dev *pdev)
>>  	}
>>  }
>>
>> -#ifdef CONFIG_PM
>> -
>> -static int sundance_suspend(struct pci_dev *pci_dev, pm_message_t state)
>> +static int __maybe_unused sundance_suspend(struct device *dev_d)
>>  {
>> -	struct net_device *dev = pci_get_drvdata(pci_dev);
>> +	struct net_device *dev = dev_get_drvdata(dev_d);
>>  	struct netdev_private *np = netdev_priv(dev);
>>  	void __iomem *ioaddr = np->base;
>>
>> @@ -1942,30 +1940,24 @@ static int sundance_suspend(struct pci_dev
>> *pci_dev,
>> pm_message_t state)
>>  	netdev_close(dev);
>>  	netif_device_detach(dev);
>>
>> -	pci_save_state(pci_dev);
>>  	if (np->wol_enabled) {
>>  		iowrite8(AcceptBroadcast | AcceptMyPhys, ioaddr + RxMode);
>>  		iowrite16(RxEnable, ioaddr + MACCtrl1);
>>  	}
>> -	pci_enable_wake(pci_dev, pci_choose_state(pci_dev, state),
>> -			np->wol_enabled);
>> -	pci_set_power_state(pci_dev, pci_choose_state(pci_dev, state));
>> +
>> +	device_set_wakeup_enable(dev_d, np->wol_enabled);
>>
>>  	return 0;
>>  }
>>
>> -static int sundance_resume(struct pci_dev *pci_dev)
>> +static int __maybe_unused sundance_resume(struct device *dev_d)
>>  {
>> -	struct net_device *dev = pci_get_drvdata(pci_dev);
>> +	struct net_device *dev = dev_get_drvdata(dev_d);
>>  	int err = 0;
>>
>>  	if (!netif_running(dev))
>>  		return 0;
>>
>> -	pci_set_power_state(pci_dev, PCI_D0);
>> -	pci_restore_state(pci_dev);
>> -	pci_enable_wake(pci_dev, PCI_D0, 0);
>> -
>>  	err = netdev_open(dev);
>>  	if (err) {
>>  		printk(KERN_ERR "%s: Can't resume interface!\n",
>> @@ -1979,17 +1971,14 @@ static int sundance_resume(struct pci_dev
>> *pci_dev)
>>  	return err;
>>  }
>>
>> -#endif /* CONFIG_PM */
>> +static SIMPLE_DEV_PM_OPS(sundance_pm_ops, sundance_suspend,
>> sundance_resume);
>>
>>  static struct pci_driver sundance_driver = {
>>  	.name		= DRV_NAME,
>>  	.id_table	= sundance_pci_tbl,
>>  	.probe		= sundance_probe1,
>>  	.remove		= sundance_remove1,
>> -#ifdef CONFIG_PM
>> -	.suspend	= sundance_suspend,
>> -	.resume		= sundance_resume,
>> -#endif /* CONFIG_PM */
>> +	.driver.pm	= &sundance_pm_ops,
>>  };
>>
>>  static int __init sundance_init(void)
>> --
>> 2.27.0
>>
>>
>