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>
diff --git a/arch/arm/mach-uniphier/clk/pll-base-ld20.c b/arch/arm/mach-uniphier/clk/pll-base-ld20.c
index 45fdf0a..c9b78b9 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 @@
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);