mmc: sdhci: restore the enabled dma when do reset all

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@freescale.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 96f4e548ba22154b102f328043e62f1b2e0594d4..8d66706824a6105ceeac2f63526372a4f0c521fd 100644 (file)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -212,6 +212,11 @@ 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);