pm8001: Fix hibernation issue

During hibernation, the HBA firmware may lose power and forget the device
id info.   This causes the HBA to reject IO upon resume.   The fix is
to call the libsas power management routines to make the domain device
forgetful.

This fixes bug 76681: https://bugzilla.kernel.org/show_bug.cgi?id=76681

Signed-off-by: Bradley Grove <bgrove@attotech.com>
Acked-by: Jack Wang <xjtuwjp@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/pm8001/pm8001_init.c

@@ -964,6 +964,7 @@ static int pm8001_pci_suspend(struct pci_dev *pdev, pm_message_t state)
 	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) {
@@ -1013,6 +1014,7 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
 	int rc;
 	u8 i = 0, j;
 	u32 device_state;
+	DECLARE_COMPLETION_ONSTACK(completion);
 	pm8001_ha = sha->lldd_ha;
 	device_state = pdev->current_state;
 
@@ -1033,7 +1035,7 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
 	rc = pci_go_44(pdev);
 	if (rc)
 		goto err_out_disable;
-
+	sas_prep_resume_ha(sha);
 	/* chip soft rst only for spc */
 	if (pm8001_ha->chip_id == chip_8001) {
 		PM8001_CHIP_DISP->chip_soft_rst(pm8001_ha);
@@ -1065,7 +1067,13 @@ static int pm8001_pci_resume(struct pci_dev *pdev)
 		for (i = 1; i < pm8001_ha->number_of_intr; i++)
 			PM8001_CHIP_DISP->interrupt_enable(pm8001_ha, i);
 	}
-	scsi_unblock_requests(pm8001_ha->shost);
+	pm8001_ha->flags = PM8001F_RUN_TIME;
+	for (i = 0; i < pm8001_ha->chip->n_phy; i++) {
+		pm8001_ha->phy[i].enable_completion = &completion;
+		PM8001_CHIP_DISP->phy_start_req(pm8001_ha, i);
+		wait_for_completion(&completion);
+	}
+	sas_resume_ha(sha);
 	return 0;
 
 err_out_disable: