linux-kernel - [patch 112/164] sata_via: magic vt6421 fix for transmission problems w/ WD drives

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Date:	Thu, 01 Jul 2010 10:34:58 -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,
	Tejun Heo <tj@...nel.org>, Jeff Garzik <jgarzik@...hat.com>
Subject: [patch 112/164] sata_via: magic vt6421 fix for transmission problems w/ WD drives

2.6.33-stable review patch.  If anyone has any objections, please let me know.

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

From: Tejun Heo <tj@...nel.org>

commit 8b27ff4cf6d15964aa2987aeb58db4dfb1f87a19 upstream.

vt6421 has problems talking to recent WD drives.  It causes a lot of
transmission errors while high bandwidth transfer as reported in the
following bugzilla entry.

  https://bugzilla.kernel.org/show_bug.cgi?id=15173

Joseph Chan provided the following fix.  I don't have any idea what it
does but I can verify the issue is gone with the patch applied.

Signed-off-by: Tejun Heo <tj@...nel.org>
Originally-from: Joseph Chan <JosephChan@....com.tw>
Reported-by: Jorrit Tijben <sjorrit@...il.com>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/ata/sata_via.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- a/drivers/ata/sata_via.c
+++ b/drivers/ata/sata_via.c
@@ -558,6 +558,19 @@ static void svia_configure(struct pci_de
 		tmp8 |= NATIVE_MODE_ALL;
 		pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
 	}
+
+	/*
+	 * vt6421 has problems talking to some drives.  The following
+	 * is the magic fix from Joseph Chan <JosephChan@....com.tw>.
+	 * Please add proper documentation if possible.
+	 *
+	 * https://bugzilla.kernel.org/show_bug.cgi?id=15173
+	 */
+	if (pdev->device == 0x3249) {
+		pci_read_config_byte(pdev, 0x52, &tmp8);
+		tmp8 |= 1 << 2;
+		pci_write_config_byte(pdev, 0x52, tmp8);
+	}
 }
 
 static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)


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