scsi: hisi_sas: Add check for methods _PS0 and _PR0

To support system suspend/resume or runtime suspend/resume, need to use the
function pci_set_power_state() to change the power state which requires at
least method _PS0 or _PR0 be filled by platform for v3 hw. So check whether
the method is supported, if not, print a warning.

A Kconfig dependency is added as there is no stub for
acpi_device_power_manageable().

Link: https://lore.kernel.org/r/1601649038-25534-5-git-send-email-john.garry@huawei.com
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/hisi_sas/Kconfig

@@ -15,5 +15,6 @@ config SCSI_HISI_SAS_PCI
 	tristate "HiSilicon SAS on PCI bus"
 	depends on SCSI_HISI_SAS
 	depends on PCI
+	depends on ACPI
 	help
 		This driver supports HiSilicon's SAS HBA based on PCI device

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -903,6 +903,7 @@ static int reset_hw_v3_hw(struct hisi_hba *hisi_hba)
 static int hw_init_v3_hw(struct hisi_hba *hisi_hba)
 {
 	struct device *dev = hisi_hba->dev;
+	struct acpi_device *acpi_dev;
 	union acpi_object *obj;
 	guid_t guid;
 	int rc;
@@ -933,6 +934,9 @@ static int hw_init_v3_hw(struct hisi_hba *hisi_hba)
 	else
 		ACPI_FREE(obj);
 
+	acpi_dev = ACPI_COMPANION(dev);
+	if (!acpi_device_power_manageable(acpi_dev))
+		dev_notice(dev, "neither _PS0 nor _PR0 is defined\n");
 	return 0;
 }