| Message ID | 1324285004-32354-3-git-send-email-chander.kashyap@linaro.org |
|---|---|
| State | Accepted |
| Headers | show |
Dear Chander Kashyap, On 19 December 2011 17:56, Chander Kashyap <chander.kashyap@linaro.org> wrote: > Earliar ARM clock frequency was calculated by: > MOUTAPLL/(DIVAPLL + 1) which is actually returning SCLKAPLL. > It is fixed by calculating it as follows: > ARMCLK=MOUTCORE / (DIVCORE + 1) / (DIVCORE2 + 1) > > Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org> > --- > Changes for V2: > - Fixed commit comment > - Fixed comment in clock.c "exynos4_get_arm_clk ()" > - Renamed dout_apll to armclk in clock.c "exynos4_get_arm_clk ()" > arch/arm/cpu/armv7/exynos/clock.c | 15 +++++++++------ > 1 files changed, 9 insertions(+), 6 deletions(-) > applied to u-boot-samsung. Thanks, Minkyu Kang.
diff --git a/arch/arm/cpu/armv7/exynos/clock.c b/arch/arm/cpu/armv7/exynos/clock.c index 64de262..0c199cd 100644 --- a/arch/arm/cpu/armv7/exynos/clock.c +++ b/arch/arm/cpu/armv7/exynos/clock.c @@ -102,17 +102,20 @@ static unsigned long exynos4_get_arm_clk(void) struct exynos4_clock *clk = (struct exynos4_clock *)samsung_get_base_clock(); unsigned long div; - unsigned long dout_apll; - unsigned int apll_ratio; + unsigned long armclk; + unsigned int core_ratio; + unsigned int core2_ratio; div = readl(&clk->div_cpu0); - /* APLL_RATIO: [26:24] */ - apll_ratio = (div >> 24) & 0x7; + /* CORE_RATIO: [2:0], CORE2_RATIO: [30:28] */ + core_ratio = (div >> 0) & 0x7; + core2_ratio = (div >> 28) & 0x7; - dout_apll = get_pll_clk(APLL) / (apll_ratio + 1); + armclk = get_pll_clk(APLL) / (core_ratio + 1); + armclk /= (core2_ratio + 1); - return dout_apll; + return armclk; } /* exynos4: return pwm clock frequency */
Earliar ARM clock frequency was calculated by: MOUTAPLL/(DIVAPLL + 1) which is actually returning SCLKAPLL. It is fixed by calculating it as follows: ARMCLK=MOUTCORE / (DIVCORE + 1) / (DIVCORE2 + 1) Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org> --- Changes for V2: - Fixed commit comment - Fixed comment in clock.c "exynos4_get_arm_clk ()" - Renamed dout_apll to armclk in clock.c "exynos4_get_arm_clk ()" arch/arm/cpu/armv7/exynos/clock.c | 15 +++++++++------ 1 files changed, 9 insertions(+), 6 deletions(-)