Messages in this thread Patch in this message |  | | From | David Wu <> | Subject | [PATCH] i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings | Date | Sat, 22 Oct 2016 16:43:42 +0800 |
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We found a bug that i2c transfer sometimes failed on 3066a board with stabel-4.8, the con register would be updated by uninitialized tuning value, it made the i2c transfer failed.
So give the tuning value to be zero during rk3x_i2c_v0_calc_timings.
Signed-off-by: David Wu <david.wu@rock-chips.com> --- drivers/i2c/busses/i2c-rk3x.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index 50702c7..df22066 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -694,6 +694,8 @@ static int rk3x_i2c_v0_calc_timings(unsigned long clk_rate, t_calc->div_low--; t_calc->div_high--; + /* Give the tuning value 0, that would not update con register */ + t_calc->tuning = 0; /* Maximum divider supported by hw is 0xffff */ if (t_calc->div_low > 0xffff) { t_calc->div_low = 0xffff; -- 1.9.1
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