Thread (24 messages) 24 messages, 4 authors, 2016-05-12

[PATCH v8 8/8] i2c: rk3x: support fast-mode plus for rk3399

From: Caesar Wang <hidden>
Date: 2016-05-11 11:45:09
Also in: linux-devicetree, linux-i2c, linux-rockchip, lkml


? 2016?05?11? 03:33, David Wu ??:
Signed-off-by: David Wu <redacted>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Caesar Wang <redacted>
quoted hunk ↗ jump to hunk
---
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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