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Diffstat (limited to 'arch/arm/mach-imx/clk-pllv1.c')
-rw-r--r--arch/arm/mach-imx/clk-pllv1.c23
1 files changed, 19 insertions, 4 deletions
diff --git a/arch/arm/mach-imx/clk-pllv1.c b/arch/arm/mach-imx/clk-pllv1.c
index c1eaee346954..d21d14ca46c1 100644
--- a/arch/arm/mach-imx/clk-pllv1.c
+++ b/arch/arm/mach-imx/clk-pllv1.c
@@ -18,6 +18,11 @@
*
* PLL clock version 1, found on i.MX1/21/25/27/31/35
*/
+
+#define MFN_BITS (10)
+#define MFN_SIGN (BIT(MFN_BITS - 1))
+#define MFN_MASK (MFN_SIGN - 1)
+
struct clk_pllv1 {
struct clk_hw hw;
void __iomem *base;
@@ -25,6 +30,11 @@ struct clk_pllv1 {
#define to_clk_pllv1(clk) (container_of(clk, struct clk_pllv1, clk))
+static inline bool mfn_is_negative(unsigned int mfn)
+{
+ return !cpu_is_mx1() && !cpu_is_mx21() && (mfn & MFN_SIGN);
+}
+
static unsigned long clk_pllv1_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
@@ -58,10 +68,15 @@ static unsigned long clk_pllv1_recalc_rate(struct clk_hw *hw,
/*
* On all i.MXs except i.MX1 and i.MX21 mfn is a 10bit
- * 2's complements number
+ * 2's complements number.
+ * On i.MX27 the bit 9 is the sign bit.
*/
- if (!cpu_is_mx1() && !cpu_is_mx21() && mfn >= 0x200)
- mfn_abs = 0x400 - mfn;
+ if (mfn_is_negative(mfn)) {
+ if (cpu_is_mx27())
+ mfn_abs = mfn & MFN_MASK;
+ else
+ mfn_abs = BIT(MFN_BITS) - mfn;
+ }
rate = parent_rate * 2;
rate /= pd + 1;
@@ -70,7 +85,7 @@ static unsigned long clk_pllv1_recalc_rate(struct clk_hw *hw,
do_div(ll, mfd + 1);
- if (!cpu_is_mx1() && !cpu_is_mx21() && mfn >= 0x200)
+ if (mfn_is_negative(mfn))
ll = -ll;
ll = (rate * mfi) + ll;