Synopsis Designware host controller has suppport for open
drain mode selection. During the mmc card initialization the
host controller can select the open-drain bit to allow the device
initialization in the open-drain mode. Once the device enters
the standby mode this bit can be reset to enter push-pull mode.
Signed-off-by: Girish K S <girish.shivananjappa@xxxxxxxxxx>
---
drivers/mmc/host/dw_mmc.c | 14 ++++++++++++++
drivers/mmc/host/dw_mmc.h | 1 +
2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 72dc3cd..da11e5a 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -773,6 +773,18 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq)
spin_unlock_bh(&host->lock);
}
+static void dw_mci_set_busmode(struct dw_mci_slot *slot)
+{
+ struct mmc_ios *ios = &slot->mmc->ios;
+ u32 reg;
+
+ reg = mci_readl(slot->host, CTRL);
+ if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN)
+ mci_writel(slot->host, CTRL, reg | SDMMC_CTRL_ENABLE_OD);
+ else
+ mci_writel(slot->host, CTRL, reg & ~SDMMC_CTRL_ENABLE_OD);
+}
+
static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct dw_mci_slot *slot = mmc_priv(mmc);
@@ -818,6 +830,8 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
default:
break;
}
+
+ dw_mci_set_busmode(slot);
}
static int dw_mci_get_ro(struct mmc_host *mmc)
diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
index 15c27e1..1a53fb2 100644
--- a/drivers/mmc/host/dw_mmc.h
+++ b/drivers/mmc/host/dw_mmc.h
@@ -67,6 +67,7 @@
/* Control register defines */
#define SDMMC_CTRL_USE_IDMAC BIT(25)
+#define SDMMC_CTRL_ENABLE_OD BIT(24)
#define SDMMC_CTRL_CEATA_INT_EN BIT(11)
#define SDMMC_CTRL_SEND_AS_CCSD BIT(10)
#define SDMMC_CTRL_SEND_CCSD BIT(9)
--
1.7.4.1
--
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