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rtc: m41t80: fix m41t80_sqw_round_rate return value 

Previously it was returning the best of
32768, 8192, 1024, 64, 2, 0

Now, best of
32768, 8192, 4096, 2048, 1024, 512, 256, 128,
64, 32, 16, 8, 4, 2, 1, 0

Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Troy Kisky 2017-11-02 18:58:13 -07:00 committed by Alexandre Belloni
parent de6042d2fa
commit c8384bb042
1 changed files with 7 additions and 12 deletions
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19
drivers/rtc/rtc-m41t80.c
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@ -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,