diff options
Diffstat (limited to 'drivers/mmc/exynos_dw_mmc.c')
| -rw-r--r-- | drivers/mmc/exynos_dw_mmc.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c index b3e5c5e5e0..de8cdcc42b 100644 --- a/drivers/mmc/exynos_dw_mmc.c +++ b/drivers/mmc/exynos_dw_mmc.c @@ -29,9 +29,22 @@ static void exynos_dwmci_clksel(struct dwmci_host *host) dwmci_writel(host, DWMCI_CLKSEL, host->clksel_val); } -unsigned int exynos_dwmci_get_clk(int dev_index) +unsigned int exynos_dwmci_get_clk(struct dwmci_host *host) { - return get_mmc_clk(dev_index); + unsigned long sclk; + int8_t clk_div; + + /* + * Since SDCLKIN is divided inside controller by the DIVRATIO + * value set in the CLKSEL register, we need to use the same output + * clock value to calculate the CLKDIV value. + * as per user manual:cclk_in = SDCLKIN / (DIVRATIO + 1) + */ + clk_div = ((dwmci_readl(host, DWMCI_CLKSEL) >> DWMCI_DIVRATIO_BIT) + & DWMCI_DIVRATIO_MASK) + 1; + sclk = get_mmc_clk(host->dev_index); + + return sclk / clk_div; } static void exynos_dwmci_board_init(struct dwmci_host *host) |
