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| author | Troy Kisky <troy.kisky@boundarydevices.com> | 2017-11-02 18:58:13 -0700 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-11-08 07:52:23 +0100 |
| commit | c8384bb04261b9d32fe7402a6068ddaf38913b23 (patch) | |
| tree | 3d587883486b42b4b82847b806d0b9cf87748d4e /drivers/rtc/rtc-m41t80.c | |
| parent | de6042d2fa8afe22b76e3c68fd6e9584c9415a3b (diff) | |
| download | lwn-c8384bb04261b9d32fe7402a6068ddaf38913b23.tar.gz lwn-c8384bb04261b9d32fe7402a6068ddaf38913b23.zip | |
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>
Diffstat (limited to 'drivers/rtc/rtc-m41t80.c')
| -rw-r--r-- | drivers/rtc/rtc-m41t80.c | 19 |
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, |