[Trusty/Utopic/Vivid/Wily][PATCH] mmc: sdhci-pci: set the clear transfer mode register quirk for O2Micro

[Adam Lee]

BugLink: https://bugs.launchpad.net/bugs/1472843

This patch fixes MMC not working issue on O2Micro/BayHub Host, which
requires transfer mode register to be cleared when sending no DMA
command.

Signed-off-by: Peter Guo <peter.guo at bayhubtech.com>
Signed-off-by: Adam Lee <adam.lee at canonical.com>
Cc: stable <stable at vger.kernel.org>
Signed-off-by: Ulf Hansson <ulf.hansson at linaro.org>
(cherry picked from commit 143b648ddf1583905fa15d32be27a31442fc7933)
Signed-off-by: Adam Lee <adam.lee at canonical.com>
---
 drivers/mmc/host/sdhci-pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index 0955777..0339120 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -517,6 +517,7 @@ static int jmicron_resume(struct sdhci_pci_chip *chip)
 static const struct sdhci_pci_fixes sdhci_o2 = {
 	.probe = sdhci_pci_o2_probe,
 	.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
+	.quirks2 = SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD,
 	.probe_slot = sdhci_pci_o2_probe_slot,
 	.resume = sdhci_pci_o2_resume,
 };
-- 
2.5.1