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From: Alexander Motin <mav@FreeBSD.org>
Date: Fri, 20 Feb 2009 20:29:33 +0000 (UTC)
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Subject: svn commit: r188862 - head/sys/dev/ata/chipsets
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Author: mav
Date: Fri Feb 20 20:29:32 2009
New Revision: 188862
URL: http://svn.freebsd.org/changeset/base/188862

Log:
  Reduce soft-reset assertion time from 5ms to 50us.
  ATA specification declares minimal reset time of 5us. SATA keeps it, but
  requires devices to handle commands transmitted even one by one without
  any gap.

Modified:
  head/sys/dev/ata/chipsets/ata-ahci.c

Modified: head/sys/dev/ata/chipsets/ata-ahci.c
==============================================================================
--- head/sys/dev/ata/chipsets/ata-ahci.c	Fri Feb 20 20:20:00 2009	(r188861)
+++ head/sys/dev/ata/chipsets/ata-ahci.c	Fri Feb 20 20:29:32 2009	(r188862)
@@ -653,7 +653,7 @@ ata_ahci_softreset(device_t dev, int por
 	device_printf(dev, "setting SRST failed ??\n");
 	//return -1;
 
-    ata_udelay(5000);
+    ata_udelay(50);
 
     /* pull reset inactive -> device softreset */
     bzero(ctp->cfis, 64);