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Groups > linux.kernel > #1401539

[PATCH v10 8/8] i2c: rk3x: support fast-mode plus for rk3399

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Implement fast mode plus that allows bus speeds of up to 1MHz.

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>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
---
Change in v10:
- none

Change in v9:
- add commit message

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 a96b516..2938616 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
@@ -532,8 +543,10 @@ 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;
 }
 
 /**
@@ -744,9 +757,9 @@ 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))
-- 
1.9.1

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[PATCH v10 0/8] add i2c driver supported for rk3399 David Wu <david.wu@rock-chips.com> - 2016-05-16 16:20 +0200
  [PATCH v10 7/8] i2c: rk3x: add i2c support for rk3399 soc David Wu <david.wu@rock-chips.com> - 2016-05-16 16:30 +0200
    Re: [PATCH v10 7/8] i2c: rk3x: add i2c support for rk3399 soc Doug Anderson <dianders@chromium.org> - 2016-05-16 19:30 +0200
  [PATCH v10 5/8] i2c: rk3x: Move spec timing data to "static const" structs David Wu <david.wu@rock-chips.com> - 2016-05-16 16:30 +0200
  [PATCH v10 8/8] i2c: rk3x: support fast-mode plus for rk3399 David Wu <david.wu@rock-chips.com> - 2016-05-16 16:30 +0200
  [PATCH v10 6/8] dt-bindings: i2c: rk3x: add support for rk3399 David Wu <david.wu@rock-chips.com> - 2016-05-16 16:30 +0200
    Re: [PATCH v10 6/8] dt-bindings: i2c: rk3x: add support for rk3399 Rob Herring <robh@kernel.org> - 2016-05-16 18:50 +0200
  Re: [PATCH v10 0/8] add i2c driver supported for rk3399 Doug Anderson <dianders@chromium.org> - 2016-05-16 22:20 +0200

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