From: Jaehoon Chung <jh80.chung@samsung.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 7/9] mmc: dw_mmc: support the DDR mode
Date: Thu, 27 Mar 2014 17:54:49 +0900 [thread overview]
Message-ID: <5333E759.5000105@samsung.com> (raw)
Support the DDR mode at dw-mmc controller.
Signed-off-by: Jaehoon Chung <jh80.chung@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
reply other threads:[~2014-03-27 8:54 UTC|newest]
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