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authorTejun Heo <tj@kernel.org>2010-04-09 19:46:38 +0900
committerJeff Garzik <jgarzik@redhat.com>2010-05-14 17:08:02 -0400
commitb48d58f55aa1d2d0d12378e45663842d4021916e (patch)
tree6fe1afb742eef755f4d09022548b6d2d2f8e919e /include/linux/libata.h
parent294440887b32c58d220fb54b73b7a58079b78f20 (diff)
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libata: use longer 0xff wait if parallel scan is enabled
There are some SATA devices which take relatively long to get out of 0xff status after reset. In libata, this timeout is determined by ATA_TMOUT_FF_WAIT. Quantum GoVault is the worst requring about 2s for reliable detection. However, because 2s 0xff timeout can introduce rather long spurious delay during boot, libata has been compromising at the next longest timeout of 800ms for HHD424020F7SV00 iVDR drive. Now that parallel scan is in place for common drivers, libata can afford 2s 0xff timeout. Use 2s 0xff timeout if parallel scan is enabled. Please note that the chance of spurious wait is pretty slim w/ working SCR access so this will only affect SATA controllers w/o SCR access which isn't too common these days. Please read the following thread for more information on the GoVault drive. http://thread.gmane.org/gmane.linux.ide/14545/focus=14663 Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Gary Hade <garyhade@us.ibm.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'include/linux/libata.h')
-rw-r--r--include/linux/libata.h11
1 files changed, 6 insertions, 5 deletions
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 4fa748e..242eb26 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -256,12 +256,13 @@ enum {
ATA_TMOUT_INTERNAL_QUICK = 5000,
ATA_TMOUT_MAX_PARK = 30000,
- /* FIXME: GoVault needs 2s but we can't afford that without
- * parallel probing. 800ms is enough for iVDR disk
- * HHD424020F7SV00. Increase to 2secs when parallel probing
- * is in place.
+ /*
+ * GoVault needs 2s and iVDR disk HHD424020F7SV00 800ms. 2s
+ * is too much without parallel probing. Use 2s if parallel
+ * probing is available, 800ms otherwise.
*/
- ATA_TMOUT_FF_WAIT = 800,
+ ATA_TMOUT_FF_WAIT_LONG = 2000,
+ ATA_TMOUT_FF_WAIT = 800,
/* Spec mandates to wait for ">= 2ms" before checking status
* after reset. We wait 150ms, because that was the magic
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