On Mon, Jul 20, 2020 at 07:04:20PM +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/hisi_sas/hisi_sas_v3_hw.c | 32 +++++++++-----------------
> 1 file changed, 11 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> index 55e2321a65bc..824bfbe1abbb 100644
> --- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> +++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
> @@ -3374,13 +3374,13 @@ enum {
> hip08,
> };
>
> -static int hisi_sas_v3_suspend(struct pci_dev *pdev, pm_message_t state)
> +static int __maybe_unused hisi_sas_v3_suspend(struct device *dev_d)
> {
> + struct pci_dev *pdev = to_pci_dev(dev_d);
> struct sas_ha_struct *sha = pci_get_drvdata(pdev);
> struct hisi_hba *hisi_hba = sha->lldd_ha;
> struct device *dev = hisi_hba->dev;
> struct Scsi_Host *shost = hisi_hba->shost;
> - pci_power_t device_state;
> int rc;
>
> if (!pdev->pm_cap) {
> @@ -3406,12 +3406,7 @@ static int hisi_sas_v3_suspend(struct pci_dev *pdev, pm_message_t state)
>
> hisi_sas_init_mem(hisi_hba);
>
> - device_state = pci_choose_state(pdev, state);
> - dev_warn(dev, "entering operating state [D%d]\n",
> - device_state);
> - pci_save_state(pdev);
> - pci_disable_device(pdev);
> - pci_set_power_state(pdev, device_state);
> + dev_warn(dev, "entering suspend state\n");
>
> hisi_sas_release_tasks(hisi_hba);
>
> @@ -3419,8 +3414,9 @@ static int hisi_sas_v3_suspend(struct pci_dev *pdev, pm_message_t state)
> return 0;
> }
>
> -static int hisi_sas_v3_resume(struct pci_dev *pdev)
> +static int __maybe_unused hisi_sas_v3_resume(struct device *dev_d)
> {
> + struct pci_dev *pdev = to_pci_dev(dev_d);
> struct sas_ha_struct *sha = pci_get_drvdata(pdev);
> struct hisi_hba *hisi_hba = sha->lldd_ha;
> struct Scsi_Host *shost = hisi_hba->shost;
> @@ -3430,16 +3426,8 @@ static int hisi_sas_v3_resume(struct pci_dev *pdev)
>
> dev_warn(dev, "resuming from operating state [D%d]\n",
> 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) {
> - dev_err(dev, "enable device failed during resume (%d)\n", rc);
> - return rc;
> - }
> + device_wakeup_disable(dev_d);
>
> - pci_set_master(pdev);
> scsi_unblock_requests(shost);
> clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
>
> @@ -3447,7 +3435,6 @@ static int hisi_sas_v3_resume(struct pci_dev *pdev)
> rc = hw_init_v3_hw(hisi_hba);
> if (rc) {
> scsi_remove_host(shost);
> - pci_disable_device(pdev);
> return rc;
> }
> hisi_hba->hw->phys_init(hisi_hba);
> @@ -3468,13 +3455,16 @@ static const struct pci_error_handlers hisi_sas_err_handler = {
> .reset_done = hisi_sas_reset_done_v3_hw,
> };
>
> +static SIMPLE_DEV_PM_OPS(hisi_sas_v3_pm_ops,
> + hisi_sas_v3_suspend,
> + hisi_sas_v3_resume);
> +
> static struct pci_driver sas_v3_pci_driver = {
> .name = DRV_NAME,
> .id_table = sas_v3_pci_table,
> .probe = hisi_sas_v3_probe,
> .remove = hisi_sas_v3_remove,
> - .suspend = hisi_sas_v3_suspend,
> - .resume = hisi_sas_v3_resume,
> + .driver.pm = &hisi_sas_v3_pm_ops,
> .err_handler = &hisi_sas_err_handler,
> };
>
> --
> 2.27.0
>
.
