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path: root/drivers/clk/clk-fractional-divider.c
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Diffstat (limited to 'drivers/clk/clk-fractional-divider.c')
-rw-r--r--drivers/clk/clk-fractional-divider.c27
1 files changed, 20 insertions, 7 deletions
diff --git a/drivers/clk/clk-fractional-divider.c b/drivers/clk/clk-fractional-divider.c
index 479297763e..5067e067e9 100644
--- a/drivers/clk/clk-fractional-divider.c
+++ b/drivers/clk/clk-fractional-divider.c
@@ -123,6 +123,7 @@ void clk_fractional_divider_general_approximation(struct clk_hw *hw,
unsigned long *m, unsigned long *n)
{
struct clk_fractional_divider *fd = to_clk_fd(hw);
+ unsigned long max_m, max_n;
/*
* Get rate closer to *parent_rate to guarantee there is no overflow
@@ -138,10 +139,17 @@ void clk_fractional_divider_general_approximation(struct clk_hw *hw,
rate <<= scale - fd->nwidth;
}
- rational_best_approximation(rate, *parent_rate,
- GENMASK(fd->mwidth - 1, 0), GENMASK(fd->nwidth - 1, 0),
- m, n);
+ if (fd->flags & CLK_FRAC_DIVIDER_ZERO_BASED) {
+ max_m = 1 << fd->mwidth;
+ max_n = 1 << fd->nwidth;
+ } else {
+ max_m = GENMASK(fd->mwidth - 1, 0);
+ max_n = GENMASK(fd->nwidth - 1, 0);
+ }
+
+ rational_best_approximation(rate, *parent_rate, max_m, max_n, m, n);
}
+EXPORT_SYMBOL_GPL(clk_fractional_divider_general_approximation);
static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
@@ -169,13 +177,18 @@ static int clk_fd_set_rate(struct clk_hw *hw, unsigned long rate,
{
struct clk_fractional_divider *fd = to_clk_fd(hw);
unsigned long flags = 0;
- unsigned long m, n;
+ unsigned long m, n, max_m, max_n;
u32 mmask, nmask;
u32 val;
- rational_best_approximation(rate, parent_rate,
- GENMASK(fd->mwidth - 1, 0), GENMASK(fd->nwidth - 1, 0),
- &m, &n);
+ if (fd->flags & CLK_FRAC_DIVIDER_ZERO_BASED) {
+ max_m = 1 << fd->mwidth;
+ max_n = 1 << fd->nwidth;
+ } else {
+ max_m = GENMASK(fd->mwidth - 1, 0);
+ max_n = GENMASK(fd->nwidth - 1, 0);
+ }
+ rational_best_approximation(rate, parent_rate, max_m, max_n, &m, &n);
if (fd->flags & CLK_FRAC_DIVIDER_ZERO_BASED) {
m--;