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mmc: don't use DMA on newer ENE controllers 

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@drzeus.cx>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pierre Ossman 2008-07-04 12:51:20 +02:00 committed by Linus Torvalds
parent 46b6d94eb0
commit bf5b1935d8
1 changed files with 4 additions and 2 deletions
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6
drivers/mmc/host/sdhci.c
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@ -119,7 +119,8 @@ 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,
},
{
@ -128,7 +129,8 @@ 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,
},
{