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From: Richard Johnson <raj@cisco.com>
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Date: Thu, 22 Feb 2001 18:12:53 -0800
To: Tony Finch <dot@dotat.at>, Kevin Oberman <oberman@es.net>,
	mobile@FreeBSD.ORG
Subject: Re: Any ideas on keeping the disk spun down on laptop
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Richard Johnson writes:
 > Let me followup on my own message...
 > 
 > I put in the following kludge and it my disk drive now spins down
 > after 10 seconds just fine:

Let me correct myself.  I forgot that the disk spindown time is in 5
second increments up until 20 minutes (240*5 seconds).  After that
it's 240 + (num. of 30 minute intervals).  Here's the calculation:

     if (idle <= 240*5)
                req.sec_count = idle / 5;
        else
                req.sec_count = idle / (30*60) + 240;

so the real change I'm going with, which sets a 5 minute spindown
time, is:

*** bk_ata-disk.c       Tue Aug 22 01:41:29 2000
--- ata-disk.c  Thu Feb 22 18:07:07 2001
***************
*** 151,156 ****
--- 151,162 ----
                    0, 0, 0, 0, ATA_C_F_ENAB_WCACHE, ATA_WAIT_INTR))
        printf("ad%d: enabling write cache failed\n", adp->lun);
  
+     /* Try to turn on suspend mode after 300 seconds */
+     if (ata_command(adp->controller, adp->unit, 0xe2,
+                   0, 0, 0, 60, 0, ATA_WAIT_INTR))
+       printf("ad%d: suspend mode failed\n", adp->lun);
+ 
+ 
      /* use DMA if drive & controller supports it */
      ata_dmainit(adp->controller, adp->unit, ata_pmode(AD_PARAM),
                ata_wmode(AD_PARAM), ata_umode(AD_PARAM));

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