diff options
| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-12-06 14:16:33 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-12-12 00:36:11 +0900 |
| commit | f2ce50b2d076ccec56d33df71f77e6f3fd7a33f4 (patch) | |
| tree | a9c79dc8f2c3d08a527aa640d51048f6c9083d88 /arch/arm/mach-uniphier/clk | |
| parent | c30c44e799e1f7d5184c487809edbd612705ba5c (diff) | |
ARM: uniphier: compute SSCPLL values more precisely
Use DIV_ROUND_CLOSEST(). To make the JK value even more precise,
I used a bigger coefficient, then divide it by 512.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Diffstat (limited to 'arch/arm/mach-uniphier/clk')
| -rw-r--r-- | arch/arm/mach-uniphier/clk/pll-base-ld20.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/arm/mach-uniphier/clk/pll-base-ld20.c b/arch/arm/mach-uniphier/clk/pll-base-ld20.c index 45fdf0a322..c9b78b9e88 100644 --- a/arch/arm/mach-uniphier/clk/pll-base-ld20.c +++ b/arch/arm/mach-uniphier/clk/pll-base-ld20.c @@ -7,6 +7,7 @@ #include <linux/bitops.h> #include <linux/delay.h> +#include <linux/kernel.h> #include <linux/errno.h> #include <linux/io.h> #include <linux/sizes.h> @@ -41,13 +42,14 @@ int uniphier_ld20_sscpll_init(unsigned long reg_base, unsigned int freq, if (freq != UNIPHIER_PLL_FREQ_DEFAULT) { tmp = readl(base); /* SSCPLLCTRL */ tmp &= ~SC_PLLCTRL_SSC_DK_MASK; - tmp |= (487 * freq * ssc_rate / divn / 512) & + tmp |= DIV_ROUND_CLOSEST(487UL * freq * ssc_rate, divn * 512) & SC_PLLCTRL_SSC_DK_MASK; writel(tmp, base); tmp = readl(base + 4); tmp &= ~SC_PLLCTRL2_SSC_JK_MASK; - tmp |= (41859 * freq / divn) & SC_PLLCTRL2_SSC_JK_MASK; + tmp |= DIV_ROUND_CLOSEST(21431887UL * freq, divn * 512) & + SC_PLLCTRL2_SSC_JK_MASK; writel(tmp, base + 4); udelay(50); |