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libata: change drive ready wait after hard reset to 5s 

This fixes problems during resume with drives that take longer than 1s to
be ready.  The ATA-6 spec appears to allow 5 seconds for a drive to be
ready.

On one affected system, this patch changes "PM: resume devices took..."
message from 17 seconds to 4 seconds, and gets rid of a lot of ugly
timeout/error messages.

Without this patch, the libata code moves on after 1s, tries to send a
soft reset (which the drive doesn't see because it isn't ready) which also
times out, then an IDENTIFY command is sent to the drive which times out,
and finally the error handler will try to send another hard reset which
will finally get things working.

Signed-off-by: Stuart Hayes <stuart_hayes@dell.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
hifive-unleashed-5.1
Stuart Hayes 2009-03-04 11:59:46 -08:00 committed by Jeff Garzik
parent 559595a985
commit e7d3ef13d5
1 changed files with 1 additions and 1 deletions
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2
include/linux/libata.h
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@ -275,7 +275,7 @@ enum {
* advised to wait only for the following duration before
* doing SRST.
*/
ATA_TMOUT_PMP_SRST_WAIT = 1000,
ATA_TMOUT_PMP_SRST_WAIT = 5000,
/* ATA bus states */
BUS_UNKNOWN = 0,