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i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings

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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>
Tested-by: Andy Yan <andy.yan@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
This commit is contained in:
David Wu 2016-10-22 16:43:42 +08:00 committed by Wolfram Sang
parent ae824f0024
commit 399c168ab5
1 changed files with 2 additions and 0 deletions
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2
drivers/i2c/busses/i2c-rk3x.c
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@ -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;