The most exynos used the "Ratio + 1" as div value. And value at register is "Ratio". So if want to set exact value, it needs to subtract one.
Value at register ("Ratio") = div - 1
Signed-off-by: Jaehoon Chung jh80.chung@samsung.com --- arch/arm/cpu/armv7/exynos/clock.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index b31c13b..3110bb0 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -1656,6 +1656,10 @@ unsigned long get_mmc_clk(int dev_index)
void set_mmc_clk(int dev_index, unsigned int div) { + /* If want to set correct value, it needs to substract one from div.*/ + if (div > 0) + div -= 1; + if (cpu_is_exynos5()) { if (proid_is_exynos5420() || proid_is_exynos5800()) exynos5420_set_mmc_clk(dev_index, div);