linux-kernel - [v2.6.34-stable 059/165] ahci: Enable SB600 64bit DMA on Asus M3A

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Message-ID: <1345060109-9187-60-git-send-email-paul.gortmaker@windriver.com>
Date:	Wed, 15 Aug 2012 15:46:43 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	<stable@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Mark Nelson <mdnelson8@...il.com>, Jeff Garzik <jgarzik@...ox.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [v2.6.34-stable 059/165] ahci: Enable SB600 64bit DMA on Asus M3A

From: Mark Nelson <mdnelson8@...il.com>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    http://git.kernel.org/?p=linux/kernel/git/paulg/longterm-queue-2.6.34.git
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 3c4aa91f21f65b7b40bdfb015eacbcb8453ccae2 upstream.

Like e65cc194f7628ecaa02462f22f42fb09b50dcd49 this patch enables 64bit DMA
for the AHCI SATA controller of a board that has the SB600 southbridge. In
this case though we're enabling 64bit DMA for the Asus M3A motherboard. It
is a new enough board that all of the BIOS releases since the initial
release (0301 from 2007-10-22) work correctly with 64bit DMA enabled.

Signed-off-by: Mark Nelson <mdnelson8@...il.com>
Signed-off-by: Jeff Garzik <jgarzik@...ox.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/ata/ahci.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 9215998..a5b1fd9 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -2981,6 +2981,18 @@ static bool ahci_sb600_enable_64bit(struct pci_dev *pdev)
 				DMI_MATCH(DMI_BOARD_NAME, "MS-7376"),
 			},
 		},
+		/*
+		 * All BIOS versions for the Asus M3A support 64bit DMA.
+		 * (all release versions from 0301 to 1206 were tested)
+		 */
+		{
+			.ident = "ASUS M3A",
+			.matches = {
+				DMI_MATCH(DMI_BOARD_VENDOR,
+					  "ASUSTeK Computer INC."),
+				DMI_MATCH(DMI_BOARD_NAME, "M3A"),
+			},
+		},
 		{ }
 	};
 	const struct dmi_system_id *match;
-- 
1.7.12.rc2

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