On Mon, Jul 20, 2020 at 07:04:23PM +0530, Vaibhav Gupta 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.
>
> The driver was calling pci_save/restore_state(), pci_choose_state(),
> pci_enable/disable_device() and pci_set_power_state() which is no more
> needed.
>
> Compile-tested only.
>
> Signed-off-by: Vaibhav Gupta <vaibhavgupta40@xxxxxxxxx>
> ---
> drivers/scsi/pm8001/pm8001_init.c | 46 ++++++++++++-------------------
> 1 file changed, 17 insertions(+), 29 deletions(-)
>
> diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c
> index 9e99262a2b9d..d7d664b87720 100644
> --- a/drivers/scsi/pm8001/pm8001_init.c
> +++ b/drivers/scsi/pm8001/pm8001_init.c
> @@ -1178,23 +1178,21 @@ static void pm8001_pci_remove(struct pci_dev *pdev)
>
> /**
> * pm8001_pci_suspend - power management suspend main entry point
> - * @pdev: PCI device struct
> - * @state: PM state change to (usually PCI_D3)
> + * @dev: Device struct
> *
> * Returns 0 success, anything else error.
> */
> -static int pm8001_pci_suspend(struct pci_dev *pdev, pm_message_t state)
> +static int __maybe_unused pm8001_pci_suspend(struct device *dev)
> {
> + struct pci_dev *pdev = to_pci_dev(dev);
> struct sas_ha_struct *sha = pci_get_drvdata(pdev);
> - struct pm8001_hba_info *pm8001_ha;
> + struct pm8001_hba_info *pm8001_ha = sha->lldd_ha;
> int i, j;
> - u32 device_state;
> - pm8001_ha = sha->lldd_ha;
> sas_suspend_ha(sha);
> flush_workqueue(pm8001_wq);
> scsi_block_requests(pm8001_ha->shost);
> if (!pdev->pm_cap) {
> - dev_err(&pdev->dev, " PCI PM not supported\n");
> + dev_err(dev, " PCI PM not supported\n");
> return -ENODEV;
> }
> PM8001_CHIP_DISP->interrupt_disable(pm8001_ha, 0xFF);
> @@ -1217,24 +1215,21 @@ static int pm8001_pci_suspend(struct pci_dev *pdev, pm_message_t state)
> for (j = 0; j < PM8001_MAX_MSIX_VEC; j++)
> tasklet_kill(&pm8001_ha->tasklet[j]);
> #endif
> - device_state = pci_choose_state(pdev, state);
> pm8001_printk("pdev=0x%p, slot=%s, entering "
> - "operating state [D%d]\n", pdev,
> - pm8001_ha->name, device_state);
> - pci_save_state(pdev);
> - pci_disable_device(pdev);
> - pci_set_power_state(pdev, device_state);
> + "suspended state\n", pdev,
> + pm8001_ha->name);
> return 0;
> }
>
> /**
> * pm8001_pci_resume - power management resume main entry point
> - * @pdev: PCI device struct
> + * @dev: Device struct
> *
> * Returns 0 success, anything else error.
> */
> -static int pm8001_pci_resume(struct pci_dev *pdev)
> +static int __maybe_unused pm8001_pci_resume(struct device *dev)
> {
> + struct pci_dev *pdev = to_pci_dev(dev);
> struct sas_ha_struct *sha = pci_get_drvdata(pdev);
> struct pm8001_hba_info *pm8001_ha;
> int rc;
> @@ -1247,17 +1242,8 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
> pm8001_printk("pdev=0x%p, slot=%s, resuming from previous "
> "operating state [D%d]\n", pdev, pm8001_ha->name, device_state);
>
> - pci_set_power_state(pdev, PCI_D0);
> - pci_enable_wake(pdev, PCI_D0, 0);
> - pci_restore_state(pdev);
> - rc = pci_enable_device(pdev);
> - if (rc) {
> - pm8001_printk("slot=%s Enable device failed during resume\n",
> - pm8001_ha->name);
> - goto err_out_enable;
> - }
> + device_wakeup_disable(dev);
>
> - pci_set_master(pdev);
> rc = pci_go_44(pdev);
> if (rc)
> goto err_out_disable;
> @@ -1318,8 +1304,7 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
>
> err_out_disable:
> scsi_remove_host(pm8001_ha->shost);
> - pci_disable_device(pdev);
> -err_out_enable:
> +
> return rc;
> }
>
> @@ -1402,13 +1387,16 @@ static struct pci_device_id pm8001_pci_table[] = {
> {} /* terminate list */
> };
>
> +static SIMPLE_DEV_PM_OPS(pm8001_pci_pm_ops,
> + pm8001_pci_suspend,
> + pm8001_pci_resume);
> +
> static struct pci_driver pm8001_pci_driver = {
> .name = DRV_NAME,
> .id_table = pm8001_pci_table,
> .probe = pm8001_pci_probe,
> .remove = pm8001_pci_remove,
> - .suspend = pm8001_pci_suspend,
> - .resume = pm8001_pci_resume,
> + .driver.pm = &pm8001_pci_pm_ops,
> };
>
> /**
> --
> 2.27.0
>
.
