From f2ce50b2d076ccec56d33df71f77e6f3fd7a33f4 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Wed, 6 Dec 2017 14:16:33 +0900 Subject: [PATCH] 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 --- arch/arm/mach-uniphier/clk/pll-base-ld20.c | 6 ++++-- 1 file 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 #include +#include #include #include #include @@ -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); -- 2.25.1