[Linux-kernel-mentees] [PATCH v2 14/15] scsi: mvumi: use generic power management

[Vaibhav Gupta]

On Mon, Jul 20, 2020 at 07:04:27PM +0530, Vaibhav Gupta wrote:
> Drivers using legacy PM have to manage PCI states and device's PM states
> themselves. They also need to take care of configuration registers.
> 
> With improved and powerful support of generic PM, PCI Core takes care of
> above mentioned, device-independent, jobs.
> 
> This driver makes use of PCI helper functions like
> pci_save/restore_state(), pci_enable/disable_device(),
> pci_set_power_state() and pci_set_master() to do required operations. In
> generic mode, they are no longer needed.
> 
> Change function parameter in both .suspend() and .resume() to
> "struct device*" type. Use dev_get_drvdata() to get drv data.
> 
> Compile-tested only.
> 
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40 at gmail.com>
> ---
>  drivers/scsi/mvumi.c | 49 ++++++++++----------------------------------
>  1 file changed, 11 insertions(+), 38 deletions(-)
> 
> diff --git a/drivers/scsi/mvumi.c b/drivers/scsi/mvumi.c
> index 8906aceda4c4..7a6ef8264e47 100644
> --- a/drivers/scsi/mvumi.c
> +++ b/drivers/scsi/mvumi.c
> @@ -2558,7 +2558,7 @@ static void mvumi_detach_one(struct pci_dev *pdev)
>  
>  /**
>   * mvumi_shutdown -	Shutdown entry point
> - * @device:		Generic device structure
> + * @pdev:		PCI device structure
>   */
>  static void mvumi_shutdown(struct pci_dev *pdev)
>  {
> @@ -2567,47 +2567,28 @@ static void mvumi_shutdown(struct pci_dev *pdev)
>  	mvumi_flush_cache(mhba);
>  }
>  
> -static int __maybe_unused mvumi_suspend(struct pci_dev *pdev, pm_message_t state)
> +static int __maybe_unused mvumi_suspend(struct device *dev)
>  {
> -	struct mvumi_hba *mhba = NULL;
> +	struct pci_dev *pdev = to_pci_dev(dev);
>  
> -	mhba = pci_get_drvdata(pdev);
> +	struct mvumi_hba *mhba = pci_get_drvdata(pdev);
>  	mvumi_flush_cache(mhba);
>  
> -	pci_set_drvdata(pdev, mhba);
>  	mhba->instancet->disable_intr(mhba);
> -	free_irq(mhba->pdev->irq, mhba);
>  	mvumi_unmap_pci_addr(pdev, mhba->base_addr);
> -	pci_release_regions(pdev);
> -	pci_save_state(pdev);
> -	pci_disable_device(pdev);
> -	pci_set_power_state(pdev, pci_choose_state(pdev, state));
>  
>  	return 0;
>  }
>  
> -static int __maybe_unused mvumi_resume(struct pci_dev *pdev)
> +static int __maybe_unused mvumi_resume(struct device *dev)
>  {
>  	int ret;
> -	struct mvumi_hba *mhba = NULL;
> -
> -	mhba = pci_get_drvdata(pdev);
> -
> -	pci_set_power_state(pdev, PCI_D0);
> -	pci_enable_wake(pdev, PCI_D0, 0);
> -	pci_restore_state(pdev);
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +	struct mvumi_hba *mhba = pci_get_drvdata(pdev);
>  
> -	ret = pci_enable_device(pdev);
> -	if (ret) {
> -		dev_err(&pdev->dev, "enable device failed\n");
> -		return ret;
> -	}
> +	device_wakeup_disable(dev);
>  
> -	ret = mvumi_pci_set_master(pdev);
>  	ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
> -	if (ret)
> -		goto fail;
> -	ret = pci_request_regions(mhba->pdev, MV_DRIVER_NAME);
>  	if (ret)
>  		goto fail;
>  	ret = mvumi_map_pci_addr(mhba->pdev, mhba->base_addr);
> @@ -2627,12 +2608,6 @@ static int __maybe_unused mvumi_resume(struct pci_dev *pdev)
>  		goto unmap_pci_addr;
>  	}
>  
> -	ret = request_irq(mhba->pdev->irq, mvumi_isr_handler, IRQF_SHARED,
> -				"mvumi", mhba);
> -	if (ret) {
> -		dev_err(&pdev->dev, "failed to register IRQ\n");
> -		goto unmap_pci_addr;
> -	}
>  	mhba->instancet->enable_intr(mhba);
>  
>  	return 0;
> @@ -2642,11 +2617,12 @@ static int __maybe_unused mvumi_resume(struct pci_dev *pdev)
>  release_regions:
>  	pci_release_regions(pdev);
>  fail:
> -	pci_disable_device(pdev);
>  
>  	return ret;
>  }
>  
> +static SIMPLE_DEV_PM_OPS(mvumi_pm_ops, mvumi_suspend, mvumi_resume);
> +
>  static struct pci_driver mvumi_pci_driver = {
>  
>  	.name = MV_DRIVER_NAME,
> @@ -2654,10 +2630,7 @@ static struct pci_driver mvumi_pci_driver = {
>  	.probe = mvumi_probe_one,
>  	.remove = mvumi_detach_one,
>  	.shutdown = mvumi_shutdown,
> -#ifdef CONFIG_PM
> -	.suspend = mvumi_suspend,
> -	.resume = mvumi_resume,
> -#endif
> +	.driver.pm = &mvumi_pm_ops,
>  };
>  
>  module_pci_driver(mvumi_pci_driver);
> -- 
> 2.27.0
> 
.