[PATCH][v2] mmc:sdhci: restore the enabled dma when do reset all

[Shaohui Xie]

If dma is enabled, it'll be cleared when reset all is performed, this can
be observed on some platforms, such as P2041 which has a version 2.3
controller, but platform like P4080 which has a version 2.2 controller,
does not suffer this, so we will check if the dma is enabled, we should
restore it after reset all.

Signed-off-by: Shaohui Xie <Shaohui.Xie at freescale.com>
---
based on http://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc.git,
branch 'for-linus'.

changes for v2:
call the wrapper API instead of access the register directly.

 drivers/mmc/host/sdhci.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 19ed580..cf6a048 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -214,6 +214,11 @@ static void sdhci_reset(struct sdhci_host *host, u8 mask)
 
 	if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET)
 		sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier);
+
+	if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+		if ((host->ops->enable_dma) && (mask & SDHCI_RESET_ALL))
+			host->ops->enable_dma(host);
+	}
 }
 
 static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios);
-- 
1.6.4