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scsi: hisi_sas: Use autosuspend for the host controller

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The controller may frequently enter and exit suspend for each I/O which we
need to deal with. This is inefficient and may cause too much suspend and
resume activity for the controller.  To avoid this, use a default 5s
autosuspend for the controller to stop frequently suspending and
resuming. This value may still be modified via sysfs interfaces.

Link: https://lore.kernel.org/r/1639999298-244569-16-git-send-email-chenxiang66@hisilicon.com
Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Xiang Chen 2021-12-20 19:21:38 +08:00 • committed by Martin K. Petersen
parent 307d9f49cc
commit b4cc094922
1 changed files with 2 additions and 0 deletions
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2
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
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@ -4783,6 +4783,8 @@ hisi_sas_v3_probe(struct pci_dev *pdev, const struct pci_device_id *id)
scsi_scan_host(shost);
pm_runtime_set_autosuspend_delay(dev, 5000);
pm_runtime_use_autosuspend(dev);
/*
* For the situation that there are ATA disks connected with SAS
* controller, it additionally creates ata_port which will affect the