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-rw-r--r--drivers/rtc/rtc-m41t80.c19
1 files changed, 7 insertions, 12 deletions
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 8f5843169dc2..42fc735a5446 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -468,18 +468,13 @@ static unsigned long m41t80_sqw_recalc_rate(struct clk_hw *hw,
static long m41t80_sqw_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
- int i, freq = M41T80_SQW_MAX_FREQ;
-
- if (freq <= rate)
- return freq;
-
- for (i = 2; i <= ilog2(M41T80_SQW_MAX_FREQ); i++) {
- freq /= 1 << i;
- if (freq <= rate)
- return freq;
- }
-
- return 0;
+ if (rate >= M41T80_SQW_MAX_FREQ)
+ return M41T80_SQW_MAX_FREQ;
+ if (rate >= M41T80_SQW_MAX_FREQ / 4)
+ return M41T80_SQW_MAX_FREQ / 4;
+ if (!rate)
+ return 0;
+ return 1 << ilog2(rate);
}
static int m41t80_sqw_set_rate(struct clk_hw *hw, unsigned long rate,