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| author |   David Wu <david.wu@rock-chips.com> | 2016-10-22 16:43:42 +0800 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2016-10-25 11:11:46 +0200 |
| commit | 399c168ab5ab5e12ed55b6c91d61c24eb84c9164 (patch) | |
| tree | a8c0f00597e7df9f326405896b501e65cc4eb695 /drivers/i2c/busses/i2c-rk3x.c | |
| parent | i2c: hix5hd2: allow build with ARCH_HISI (diff) | |
| download | linux-dev-399c168ab5ab5e12ed55b6c91d61c24eb84c9164.tar.xz linux-dev-399c168ab5ab5e12ed55b6c91d61c24eb84c9164.zip | |
i2c: rk3x: Give the tuning value 0 during rk3x_i2c_v0_calc_timings
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
Diffstat (limited to 'drivers/i2c/busses/i2c-rk3x.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-rk3x.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index 50702c7bb244..df220666d627 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; |