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arm64: allwinner: clk: Test with the current parent freq first

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Even if the clock is flagged with AW_CLK_SET_PARENT the current parent
freq might be enough to get a correct divisor.
So test first if we can get the expected freq before changing the parent
freq.
This commit is contained in:
Emmanuel Vadot 2021-05-31 14:06:20 +02:00
parent bec0a5dca7
commit ac1d7397bf
1 changed files with 3 additions and 4 deletions
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7
sys/arm/allwinner/clkng/aw_clk_m.c
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@ -175,7 +175,9 @@ aw_clk_m_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout,
best = cur = 0;
if ((sc->flags & AW_CLK_SET_PARENT) != 0) {
best = aw_clk_m_find_best(sc, fparent, fout,
&best_m);
if ((best != *fout) && ((sc->flags & AW_CLK_SET_PARENT) != 0)) {
p_clk = clknode_get_parent(clk);
if (p_clk == NULL) {
printf("%s: Cannot get parent for clock %s\n",
@ -187,9 +189,6 @@ aw_clk_m_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout,
clknode_get_freq(p_clk, &fparent);
best = aw_clk_m_find_best(sc, fparent, fout,
&best_m);
} else {
best = aw_clk_m_find_best(sc, fparent, fout,
&best_m);
}
if ((flags & CLK_SET_DRYRUN) != 0) {