linux-kernel - [PATCH] mmc: don't use DMA on newer ENE controllers

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Message-ID: <20080704125120.6ccaadf5@mjolnir.drzeus.cx>
Date:	Fri, 4 Jul 2008 12:51:20 +0200
From:	Pierre Ossman <drzeus-list@...eus.cx>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Stable branch <stable@...nel.org>
Subject: [PATCH] mmc: don't use DMA on newer ENE controllers

From: Pierre Ossman <drzeus@...eus.cx>

Even the newer ENE controllers have bugs in their DMA engine that make
it too dangerous to use. Disable it until someone has figured out under
which conditions it corrupts data.

This has caused problems at least once, and can be found as bug report
10925 in the kernel bugzilla.

Signed-off-by: Pierre Ossman <drzeus@...eus.cx>

-- 

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 07c2048..116abf2 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -115,7 +115,8 @@ static const struct pci_device_id pci_ids[] __devinitdata = {
 		.subvendor      = PCI_ANY_ID,
 		.subdevice      = PCI_ANY_ID,
 		.driver_data    = SDHCI_QUIRK_SINGLE_POWER_WRITE |
-				  SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS,
+				  SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS |
+				  SDHCI_QUIRK_BROKEN_DMA,
 	},
 
 	{
@@ -124,7 +125,8 @@ static const struct pci_device_id pci_ids[] __devinitdata = {
 		.subvendor      = PCI_ANY_ID,
 		.subdevice      = PCI_ANY_ID,
 		.driver_data    = SDHCI_QUIRK_SINGLE_POWER_WRITE |
-				  SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS,
+				  SDHCI_QUIRK_RESET_CMD_DATA_ON_IOS |
+				  SDHCI_QUIRK_BROKEN_DMA,
 	},
 
 	{

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

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