4.14-stable review patch. If anyone has any objections, please let me know.
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From: Troy Kisky troy.kisky@boundarydevices.com
commit 05a03bf260e0480bfc0db91b1fdbc2115e3f193b upstream.
m41t80_sqw_set_rate will be called with the result from m41t80_sqw_round_rate, so might as well make m41t80_sqw_set_rate(n) same as m41t80_sqw_set_rate(m41t80_sqw_round_rate(n))
As Russell King wrote[1], "clk_round_rate() is supposed to tell you what you end up with if you ask clk_set_rate() to set the exact same value you passed in - but clk_round_rate() won't modify the hardware."
[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2012-January/080175.ht...
Signed-off-by: Troy Kisky troy.kisky@boundarydevices.com Signed-off-by: Alexandre Belloni alexandre.belloni@free-electrons.com Cc: Christoph Fritz chf.fritz@googlemail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/rtc/rtc-m41t80.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-)
--- a/drivers/rtc/rtc-m41t80.c +++ b/drivers/rtc/rtc-m41t80.c @@ -490,17 +490,12 @@ static int m41t80_sqw_set_rate(struct cl M41T80_REG_WDAY : M41T80_REG_SQW; int reg, ret, val = 0;
- if (rate) { - if (!is_power_of_2(rate)) - return -EINVAL; - val = ilog2(rate); - if (val == ilog2(M41T80_SQW_MAX_FREQ)) - val = 1; - else if (val < (ilog2(M41T80_SQW_MAX_FREQ) - 1)) - val = ilog2(M41T80_SQW_MAX_FREQ) - val; - else - return -EINVAL; - } + if (rate >= M41T80_SQW_MAX_FREQ) + val = 1; + else if (rate >= M41T80_SQW_MAX_FREQ / 4) + val = 2; + else if (rate) + val = 15 - ilog2(rate);
reg = i2c_smbus_read_byte_data(client, reg_sqw); if (reg < 0)