linux-kernel - [PATCH] [87/223] sata_via: apply magic FIFO fix to vt6420 too

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Message-Id: <20101212234626.BED1DB27BF@basil.firstfloor.org>
Date:	Mon, 13 Dec 2010 00:46:26 +0100 (CET)
From:	Andi Kleen <andi@...stfloor.org>
To:	tj@...nel.org, JosephChan@....com.tw, jgarzik@...hat.com,
	gregkh@...e.de, ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	stable@...nel.org
Subject: [PATCH] [87/223] sata_via: apply magic FIFO fix to vt6420 too

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

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

commit b1353e4f40f6179ab26a3bb1b2e1fe29ffe534f5 upstream.

vt6420 has the same FIFO overflow problem as vt6421 when combined with
certain devices.  This patch applies the magic fix to vt6420 too.

Signed-off-by: Tejun Heo <tj@...nel.org>
Reported-by: Martin Qvist <q@....dk>
Reported-by: Peter Zijlstra <peterz@...radead.org>
Cc: Joseph Chan <JosephChan@....com.tw>
Signed-off-by: Jeff Garzik <jgarzik@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>

---
 drivers/ata/sata_via.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Index: linux/drivers/ata/sata_via.c
===================================================================
--- linux.orig/drivers/ata/sata_via.c
+++ linux/drivers/ata/sata_via.c
@@ -538,7 +538,7 @@ static int vt8251_prepare_host(struct pc
 	return 0;
 }
 
-static void svia_configure(struct pci_dev *pdev)
+static void svia_configure(struct pci_dev *pdev, int board_id)
 {
 	u8 tmp8;
 
@@ -577,7 +577,7 @@ static void svia_configure(struct pci_de
 	}
 
 	/*
-	 * vt6421 has problems talking to some drives.  The following
+	 * vt6420/1 has problems talking to some drives.  The following
 	 * is the fix from Joseph Chan <JosephChan@....com.tw>.
 	 *
 	 * When host issues HOLD, device may send up to 20DW of data
@@ -596,8 +596,9 @@ static void svia_configure(struct pci_de
 	 *
 	 * https://bugzilla.kernel.org/show_bug.cgi?id=15173
 	 * http://article.gmane.org/gmane.linux.ide/46352
+	 * http://thread.gmane.org/gmane.linux.kernel/1062139
 	 */
-	if (pdev->device == 0x3249) {
+	if (board_id == vt6420 || board_id == vt6421) {
 		pci_read_config_byte(pdev, 0x52, &tmp8);
 		tmp8 |= 1 << 2;
 		pci_write_config_byte(pdev, 0x52, tmp8);
@@ -652,7 +653,7 @@ static int svia_init_one(struct pci_dev
 	if (rc)
 		return rc;
 
-	svia_configure(pdev);
+	svia_configure(pdev, board_id);
 
 	pci_set_master(pdev);
 	return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
--
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