summaryrefslogtreecommitdiff
path: root/drivers/clk/sunxi-ng/ccu_nkmp.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/clk/sunxi-ng/ccu_nkmp.c')
-rw-r--r--drivers/clk/sunxi-ng/ccu_nkmp.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_nkmp.c b/drivers/clk/sunxi-ng/ccu_nkmp.c
index 9f2b98e19dc9..9769dee99511 100644
--- a/drivers/clk/sunxi-ng/ccu_nkmp.c
+++ b/drivers/clk/sunxi-ng/ccu_nkmp.c
@@ -29,14 +29,14 @@ static void ccu_nkmp_find_best(unsigned long parent, unsigned long rate,
unsigned long _n, _k, _m, _p;
for (_k = 1; _k <= nkmp->max_k; _k++) {
- for (_p = 0; _p <= nkmp->max_p; _p++) {
+ for (_p = 1; _p <= nkmp->max_p; _p <<= 1) {
unsigned long tmp_rate;
- rational_best_approximation(rate / _k, parent >> _p,
+ rational_best_approximation(rate / _k, parent / _p,
nkmp->max_n, nkmp->max_m,
&_n, &_m);
- tmp_rate = (parent * _n * _k >> _p) / _m;
+ tmp_rate = parent * _n * _k / (_m * _p);
if (tmp_rate > rate)
continue;
@@ -110,13 +110,12 @@ static long ccu_nkmp_round_rate(struct clk_hw *hw, unsigned long rate,
_nkmp.max_n = 1 << nkmp->n.width;
_nkmp.max_k = 1 << nkmp->k.width;
- _nkmp.max_m = 1 << nkmp->m.width;
- _nkmp.max_p = (1 << nkmp->p.width) - 1;
+ _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
+ _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
- ccu_nkmp_find_best(*parent_rate, rate,
- &_nkmp);
+ ccu_nkmp_find_best(*parent_rate, rate, &_nkmp);
- return (*parent_rate * _nkmp.n * _nkmp.k >> _nkmp.p) / _nkmp.m;
+ return *parent_rate * _nkmp.n * _nkmp.k / (_nkmp.m * _nkmp.p);
}
static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate,
@@ -129,8 +128,8 @@ static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate,
_nkmp.max_n = 1 << nkmp->n.width;
_nkmp.max_k = 1 << nkmp->k.width;
- _nkmp.max_m = 1 << nkmp->m.width;
- _nkmp.max_p = (1 << nkmp->p.width) - 1;
+ _nkmp.max_m = nkmp->m.max ?: 1 << nkmp->m.width;
+ _nkmp.max_p = nkmp->p.max ?: 1 << ((1 << nkmp->p.width) - 1);
ccu_nkmp_find_best(parent_rate, rate, &_nkmp);
@@ -145,7 +144,7 @@ static int ccu_nkmp_set_rate(struct clk_hw *hw, unsigned long rate,
reg |= (_nkmp.n - 1) << nkmp->n.shift;
reg |= (_nkmp.k - 1) << nkmp->k.shift;
reg |= (_nkmp.m - 1) << nkmp->m.shift;
- reg |= _nkmp.p << nkmp->p.shift;
+ reg |= ilog2(_nkmp.p) << nkmp->p.shift;
writel(reg, nkmp->common.base + nkmp->common.reg);