Messages in this thread | | | Subject | Re: [PATCH v8 8/8] i2c: rk3x: support fast-mode plus for rk3399 | From | Caesar Wang <> | Date | Wed, 11 May 2016 19:44:58 +0800 |
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在 2016年05月11日 03:33, David Wu 写道: > Signed-off-by: David Wu <david.wu@rock-chips.com> > Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Caesar Wang <wxt@rock-chips.com> > --- > Change in v8: > - None > > drivers/i2c/busses/i2c-rk3x.c | 21 +++++++++++++++++---- > 1 file changed, 17 insertions(+), 4 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c > index 25ed1ad..0ba25ee 100644 > --- a/drivers/i2c/busses/i2c-rk3x.c > +++ b/drivers/i2c/busses/i2c-rk3x.c > @@ -126,6 +126,17 @@ static const struct i2c_spec_values fast_mode_spec = { > .min_hold_buffer_ns = 1300, > }; > > +static const struct i2c_spec_values fast_mode_plus_spec = { > + .min_hold_start_ns = 260, > + .min_low_ns = 500, > + .min_high_ns = 260, > + .min_setup_start_ns = 260, > + .max_data_hold_ns = 400, > + .min_data_setup_ns = 50, > + .min_setup_stop_ns = 260, > + .min_hold_buffer_ns = 500, > +}; > + > /** > * struct rk3x_i2c_calced_timings: > * @div_low: Divider output for low > @@ -531,8 +542,10 @@ static const struct i2c_spec_values *rk3x_i2c_get_spec(unsigned int speed) > { > if (speed <= 100000) > return &standard_mode_spec; > - else > + else if (speed <= 400000) > return &fast_mode_spec; > + else > + return &fast_mode_plus_spec; > } > > /** > @@ -743,9 +756,9 @@ static int rk3x_i2c_v1_calc_timings(unsigned long clk_rate, > const struct i2c_spec_values *spec; > int ret = 0; > > - /* Support standard-mode and fast-mode */ > - if (WARN_ON(t->bus_freq_hz > 400000)) > - t->bus_freq_hz = 400000; > + /* Support standard-mode, fast-mode and fast-mode plus */ > + if (WARN_ON(t->bus_freq_hz > 1000000)) > + t->bus_freq_hz = 1000000; > > /* prevent scl_rate_khz from becoming 0 */ > if (WARN_ON(t->bus_freq_hz < 1000))
-- Thanks, Caesar
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