[U-Boot] [PATCH 7/9] mmc: dw_mmc: support the DDR mode

[Jaehoon Chung]

Support the DDR mode at dw-mmc controller.

Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
---
 drivers/mmc/dw_mmc.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index d45c15c..5e9b10f 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -285,7 +285,7 @@ static int dwmci_setup_bus(struct dwmci_host *host, u32 freq)
 static void dwmci_set_ios(struct mmc *mmc)
 {
 	struct dwmci_host *host = (struct dwmci_host *)mmc->priv;
-	u32 ctype;
+	u32 ctype, regs;
 
 	debug("Buswidth = %d, clock: %d\n",mmc->bus_width, mmc->clock);
 
@@ -304,6 +304,14 @@ static void dwmci_set_ios(struct mmc *mmc)
 
 	dwmci_writel(host, DWMCI_CTYPE, ctype);
 
+	regs = dwmci_readl(host, DWMCI_UHS_REG);
+	if (mmc->card_caps & MMC_MODE_DDR_52MHz)
+		regs |= (0x1 << 16);
+	else
+		regs &= ~(0x1 << 16);
+
+	dwmci_writel(host, DWMCI_UHS_REG, regs);
+
 	if (host->clksel)
 		host->clksel(host);
 }
-- 
1.7.9.5