On Mon, Jul 20, 2020 at 07:04:26PM +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 to_pci_dev() and dev_get_drvdata() to get
> "struct pci_dev*" variable and drv data.
>
> Compile-tested only.
>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@xxxxxxxxx>
> ---
> drivers/scsi/3w-sas.c | 31 ++++++++-----------------------
> 1 file changed, 8 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
> index dda6fa857709..efaba30b0ca8 100644
> --- a/drivers/scsi/3w-sas.c
> +++ b/drivers/scsi/3w-sas.c
> @@ -1756,11 +1756,10 @@ static void twl_remove(struct pci_dev *pdev)
> twl_device_extension_count--;
> } /* End twl_remove() */
>
> -#ifdef CONFIG_PM
> /* This function is called on PCI suspend */
> -static int twl_suspend(struct pci_dev *pdev, pm_message_t state)
> +static int __maybe_unused twl_suspend(struct device *dev)
> {
> - struct Scsi_Host *host = pci_get_drvdata(pdev);
> + struct Scsi_Host *host = dev_get_drvdata(dev);
> TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
>
> printk(KERN_WARNING "3w-sas: Suspending host %d.\n", tw_dev->host->host_no);
> @@ -1779,32 +1778,21 @@ static int twl_suspend(struct pci_dev *pdev, pm_message_t state)
> /* Clear doorbell interrupt */
> TWL_CLEAR_DB_INTERRUPT(tw_dev);
>
> - pci_save_state(pdev);
> - pci_disable_device(pdev);
> - pci_set_power_state(pdev, pci_choose_state(pdev, state));
> -
> return 0;
> } /* End twl_suspend() */
>
> /* This function is called on PCI resume */
> -static int twl_resume(struct pci_dev *pdev)
> +static int __maybe_unused twl_resume(struct device *dev)
> {
> int retval = 0;
> + struct pci_dev *pdev = to_pci_dev(dev);
> struct Scsi_Host *host = pci_get_drvdata(pdev);
> TW_Device_Extension *tw_dev = (TW_Device_Extension *)host->hostdata;
>
> printk(KERN_WARNING "3w-sas: Resuming host %d.\n", tw_dev->host->host_no);
> - pci_set_power_state(pdev, PCI_D0);
> - pci_enable_wake(pdev, PCI_D0, 0);
> - pci_restore_state(pdev);
>
> - retval = pci_enable_device(pdev);
> - if (retval) {
> - TW_PRINTK(tw_dev->host, TW_DRIVER, 0x24, "Enable device failed during resume");
> - return retval;
> - }
> + device_wakeup_disable(dev);
>
> - pci_set_master(pdev);
> pci_try_set_mwi(pdev);
>
> retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
> @@ -1842,11 +1830,9 @@ static int twl_resume(struct pci_dev *pdev)
>
> out_disable_device:
> scsi_remove_host(host);
> - pci_disable_device(pdev);
>
> return retval;
> } /* End twl_resume() */
> -#endif
>
> /* PCI Devices supported by this driver */
> static struct pci_device_id twl_pci_tbl[] = {
> @@ -1855,16 +1841,15 @@ static struct pci_device_id twl_pci_tbl[] = {
> };
> MODULE_DEVICE_TABLE(pci, twl_pci_tbl);
>
> +static SIMPLE_DEV_PM_OPS(twl_pm_ops, twl_suspend, twl_resume);
> +
> /* pci_driver initializer */
> static struct pci_driver twl_driver = {
> .name = "3w-sas",
> .id_table = twl_pci_tbl,
> .probe = twl_probe,
> .remove = twl_remove,
> -#ifdef CONFIG_PM
> - .suspend = twl_suspend,
> - .resume = twl_resume,
> -#endif
> + .driver.pm = &twl_pm_ops,
> .shutdown = twl_shutdown
> };
>
> --
> 2.27.0
>
.
