scsi: Allow auto suspend override by low-level driver
Until now the scsi mid-layer forbids runtime suspend till userspace
enables it. This is mainly to quarantine some disks with broken
runtime power management or have high latencies executing suspend
resume callbacks. If the userspace doesn't enable the runtime suspend
the underlying hardware will be always on even when it is not doing
any useful work and thus wasting power.
Some low-level drivers for the controllers can efficiently use runtime
power management to reduce power consumption and improve battery life.
Allow runtime suspend parameters override within the LLD itself
instead of waiting for userspace to control the power management.
Change-Id: I03e96a89d19c174deeb5bd4f94136c77073eb009
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 7c6a558..6a54bb4 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -152,7 +152,10 @@
unsigned no_read_disc_info:1; /* Avoid READ_DISC_INFO cmds */
unsigned no_read_capacity_16:1; /* Avoid READ_CAPACITY_16 cmds */
unsigned is_visible:1; /* is the device visible in sysfs */
+ unsigned use_rpm_auto:1; /* Enable runtime PM auto suspend */
+#define SCSI_DEFAULT_AUTOSUSPEND_DELAY -1
+ int autosuspend_delay;
DECLARE_BITMAP(supported_events, SDEV_EVT_MAXBITS); /* supported events */
struct list_head event_list; /* asserted events */
struct work_struct event_work;