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path: root/drivers/clk/at91/clk-audio-pll.c
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Diffstat (limited to 'drivers/clk/at91/clk-audio-pll.c')
-rw-r--r--drivers/clk/at91/clk-audio-pll.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/clk/at91/clk-audio-pll.c b/drivers/clk/at91/clk-audio-pll.c
index 36d77146a3bd..3cc4a82f4e9f 100644
--- a/drivers/clk/at91/clk-audio-pll.c
+++ b/drivers/clk/at91/clk-audio-pll.c
@@ -340,7 +340,12 @@ static long clk_audio_pll_pmc_round_rate(struct clk_hw *hw, unsigned long rate,
pr_debug("A PLL/PMC: %s, rate = %lu (parent_rate = %lu)\n", __func__,
rate, *parent_rate);
- for (div = 1; div <= AUDIO_PLL_QDPMC_MAX; div++) {
+ if (!rate)
+ return 0;
+
+ best_parent_rate = clk_round_rate(pclk->clk, 1);
+ div = max(best_parent_rate / rate, 1UL);
+ for (; div <= AUDIO_PLL_QDPMC_MAX; div++) {
best_parent_rate = clk_round_rate(pclk->clk, rate * div);
tmp_rate = best_parent_rate / div;
tmp_diff = abs(rate - tmp_rate);
@@ -350,6 +355,8 @@ static long clk_audio_pll_pmc_round_rate(struct clk_hw *hw, unsigned long rate,
best_rate = tmp_rate;
best_diff = tmp_diff;
tmp_qd = div;
+ if (!best_diff)
+ break; /* got exact match */
}
}