From: Oskar Schirmer Date: Thu, 17 Feb 2011 15:43:02 +0000 (+0100) Subject: arm: tcc8k: Fix bus clock calculation X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=f91f9cd505f92e4227ffda7e5799a33d4f34bf36;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git arm: tcc8k: Fix bus clock calculation There are two dividers used to derive bus clock from system clock: system clock is divided by SCKDIV+1, then by BCKDIV+1. SCKDIV divider has been ignored up to now, which is no problem as long as it is 0. Take SCKDIV into account for bus clock calculation. Signed-off-by: Oskar Schirmer Cc: bigeasy@linutronix.de Signed-off-by: Thomas Gleixner --- diff --git a/arch/arm/mach-tcc8k/clock.c b/arch/arm/mach-tcc8k/clock.c index 8d8c99f89558..e7cdae5c77a4 100644 --- a/arch/arm/mach-tcc8k/clock.c +++ b/arch/arm/mach-tcc8k/clock.c @@ -308,10 +308,17 @@ static unsigned long get_rate_sys(struct clk *clk) static unsigned long get_rate_bus(struct clk *clk) { - unsigned int div; + unsigned int reg, sdiv, bdiv, rate; - div = (__raw_readl(CKC_BASE + CLKCTRL_OFFS) >> 4) & 0xff; - return get_rate_sys(clk) / (div + 1); + reg = __raw_readl(CKC_BASE + CLKCTRL_OFFS); + rate = get_rate_sys(clk); + sdiv = (reg >> 20) & 3; + if (sdiv) + rate /= sdiv + 1; + bdiv = (reg >> 4) & 0xff; + if (bdiv) + rate /= bdiv + 1; + return rate; } static unsigned long get_rate_cpu(struct clk *clk)