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ncr5380: Sleep when polling, if possible

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When in process context, sleep during polling if doing so won't add
significant latency. In interrupt context or if the lock is held, poll
briefly then give up. Keep both core drivers in sync.

Calibrate busy-wait iterations to allow for variation in chip register
access times between different 5380 hardware implementations.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Finn Thain
2016-01-03 16:05:22 +11:00
committed by Martin K. Petersen
parent 0ad0eff98f
commit 2f854b82b0
3 changed files with 93 additions and 52 deletions
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drivers/scsi/NCR5380.h
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@@ -285,6 +285,7 @@ struct NCR5380_hostdata {
unsigned spin_max_w;
#endif
struct workqueue_struct *work_q;
unsigned long accesses_per_ms; /* chip register accesses per ms */
};
#ifdef __KERNEL__