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authorVaibhav Gupta <vaibhavgupta40@gmail.com>2020-11-02 22:17:25 +0530
committerMartin K. Petersen <martin.petersen@oracle.com>2020-11-25 23:23:21 -0500
commit99769d8d9109878d3f3e805dd21dfbb44aad035c (patch)
tree381182249ff437aab231dbd7c579cf6521aecf3c /drivers/scsi/3w-sas.c
parent7ea03ab79e00fccd2a12c1526fb3c7703c8a7baa (diff)
scsi: 3w-sas: Use generic power management
Drivers should do only device-specific jobs. But in general, drivers using legacy PCI PM framework for .suspend()/.resume() have to manage many PCI PM-related tasks themselves which can be done by PCI Core itself. This brings extra load on the driver and it directly calls PCI helper functions to handle them. Switch to the new generic framework by updating function signatures and define a "struct dev_pm_ops" variable to bind PM callbacks. Also, remove unnecessary calls to the PCI Helper functions along with the legacy .suspend & .resume bindings. Link: https://lore.kernel.org/r/20201102164730.324035-25-vaibhavgupta40@gmail.com Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/3w-sas.c')
-rw-r--r--drivers/scsi/3w-sas.c31
1 files changed, 7 insertions, 24 deletions
diff --git a/drivers/scsi/3w-sas.c b/drivers/scsi/3w-sas.c
index 0b4888199699..b8f1848ecef2 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);
@@ -1779,31 +1778,18 @@ 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_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;
- }
-
- pci_set_master(pdev);
pci_try_set_mwi(pdev);
retval = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
@@ -1841,11 +1827,9 @@ 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[] = {
@@ -1854,16 +1838,15 @@ 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
};