linux-kernel - [78/85] pata_cmd64x: fix PIO setup

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Message-Id: <20110616002911.682941603@clark.kroah.org>
Date:	Wed, 15 Jun 2011 17:29:14 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Jeff Garzik <jgarzik@...hat.com>
Subject: [78/85] pata_cmd64x: fix PIO setup

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>

commit a2bd62207af4be8f5fe815ff90cc309056407829 upstream.

Fix incorrect handling of recovery clocks value == 16 resulting
in overclocked recovery timings & potentially underclocked active
timings.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/ata/pata_cmd64x.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/ata/pata_cmd64x.c
+++ b/drivers/ata/pata_cmd64x.c
@@ -2,6 +2,7 @@
  * pata_cmd64x.c 	- CMD64x PATA for new ATA layer
  *			  (C) 2005 Red Hat Inc
  *			  Alan Cox <alan@...rguk.ukuu.org.uk>
+ *			  (C) 2009-2010 Bartlomiej Zolnierkiewicz
  *
  * Based upon
  * linux/drivers/ide/pci/cmd64x.c		Version 1.30	Sept 10, 2002
@@ -147,7 +148,9 @@ static void cmd64x_set_timing(struct ata
 	/* Now convert the clocks into values we can actually stuff into
 	   the chip */
 
-	if (t.recover > 1)
+	if (t.recover == 16)
+		t.recover = 0;
+	else if (t.recover > 1)
 		t.recover--;
 	else
 		t.recover = 15;


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