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aw_clk_nm: fix incorrect use of abs()

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abs() takes a (signed) int as input.
Instead, it was used with unsigned 64-bit integers.

So, add and use a new helper function to calculate a difference between
two uint64_t-s.

Reviewed by:	manu
MFC after:	2 weeks
Differential Revision: https://reviews.freebsd.org/D26307
This commit is contained in:
Andriy Gapon 2020-09-07 06:27:18 +00:00
parent 04bd07fd15
commit c3a7328be8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=365395
2 changed files with 10 additions and 2 deletions
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6
sys/arm/allwinner/clkng/aw_clk_nm.c
View File

@ -153,7 +153,8 @@ aw_clk_nm_find_best(struct aw_clk_nm_sc *sc, uint64_t fparent, uint64_t *fout,
for (m = min_m; m <= max_m; ) {
for (n = min_n; n <= max_n; ) {
cur = fparent / n / m;
if (abs(*fout - cur) < abs(*fout - best)) {
if (clk_freq_diff(*fout, cur) <
clk_freq_diff(*fout, best)) {
best = cur;
*factor_n = n;
*factor_m = m;
@ -196,7 +197,8 @@ aw_clk_nm_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout,
clknode_get_freq(p_clk, &fparent);
cur = aw_clk_nm_find_best(sc, fparent, fout, &n, &m);
if (abs((*fout - cur)) < abs((*fout - best))) {
if (clk_freq_diff(*fout, cur) <
clk_freq_diff(*fout, best)) {
best = cur;
best_parent = p_idx;
best_n = n;

6
sys/dev/extres/clk/clk.h
View File

@ -135,6 +135,12 @@ int clk_get_parent(clk_t clk, clk_t *parent);
int clk_set_parent_by_clk(clk_t clk, clk_t parent);
const char *clk_get_name(clk_t clk);
static inline uint64_t
clk_freq_diff(uint64_t x, uint64_t y)
{
return (x >= y ? x - y : y - x);
}
#ifdef FDT
int clk_set_assigned(device_t dev, phandle_t node);
int clk_get_by_ofw_index(device_t dev, phandle_t node, int idx, clk_t *clk);