@@ -38,6 +38,7 @@
#define ESDHC_VENDOR_SPEC_FRC_SDCLK_ON (1 << 8)
#define ESDHC_WTMK_LVL 0x44
#define ESDHC_MIX_CTRL 0x48
+#define ESDHC_MIX_CTRL_DDREN (1 << 3)
#define ESDHC_MIX_CTRL_AC23EN (1 << 7)
#define ESDHC_MIX_CTRL_EXE_TUNE (1 << 22)
#define ESDHC_MIX_CTRL_SMPCLK_SEL (1 << 23)
@@ -117,6 +118,7 @@ struct pltfm_imx_data {
WAIT_FOR_INT, /* sent CMD12, waiting for response INT */
} multiblock_status;
u32 uhs_mode;
+ u32 is_ddr;
};
static struct platform_device_id imx_esdhc_devtype[] = {
@@ -523,8 +525,10 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
* The reset on usdhc fails to clear MIX_CTRL register.
* Do it manually here.
*/
- if (is_imx6_usdhc(imx_data))
+ if (is_imx6_usdhc(imx_data)) {
writel(0, host->ioaddr + ESDHC_MIX_CTRL);
+ imx_data->is_ddr = 0;
+ }
}
}
@@ -568,7 +572,7 @@ static inline void esdhc_pltfm_set_clock(struct sdhci_host *host,
goto out;
}
- if (is_imx6_usdhc(imx_data))
+ if (is_imx6_usdhc(imx_data) && !imx_data->is_ddr)
pre_div = 1;
temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
@@ -586,7 +590,10 @@ static inline void esdhc_pltfm_set_clock(struct sdhci_host *host,
dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
clock, host->mmc->actual_clock);
- pre_div >>= 1;
+ if (imx_data->is_ddr)
+ pre_div >>= 2;
+ else
+ pre_div >>= 1;
div--;
temp = sdhci_readl(host, ESDHC_SYSTEM_CONTROL);
@@ -812,6 +819,10 @@ static int esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned int uhs)
break;
case MMC_TIMING_UHS_DDR50:
imx_data->uhs_mode = SDHCI_CTRL_UHS_DDR50;
+ writel(readl(host->ioaddr + ESDHC_MIX_CTRL) |
+ ESDHC_MIX_CTRL_DDREN,
+ host->ioaddr + ESDHC_MIX_CTRL);
+ imx_data->is_ddr = 1;
break;
}
When DDR mode is enabled, the initial pre_div should be 2. And the pre_div value should be changed accordingly from ... 02h) Base clock divided by 4 01h) Base clock divided by 2 00h) Base clock divided by 1 to .. 02h) Base clock divided by 8 01h) Base clock divided by 4 00h) Base clock divided by 2 Signed-off-by: Dong Aisheng <b29396@freescale.com> --- drivers/mmc/host/sdhci-esdhc-imx.c | 17 ++++++++++++++--- 1 files changed, 14 insertions(+), 3 deletions(-)