Commit d07bdbc0 authored by Jarkko Nikula's avatar Jarkko Nikula Committed by Wolfram Sang
Browse files

i2c: designware: Add debug print for bus speed

Trivial added debug print for dev->clk_freq doesn't necessarily tell the
actual bus speed or mode the controller is operating. For instance it
may indicate 1 MHz Fast Mode Plus or 3.4 MHz High Speed but driver ends up
using 400 kHz Fast Mode due missing timing parameters or missing support
from HW.

Add a debug print that prints the bus speed based on the validated speed
that gets programmed into a HW.

Reviewed-by: default avatarAndy Shevchenko <>
Signed-off-by: default avatarJarkko Nikula <>
Signed-off-by: default avatarWolfram Sang <>
parent 1706a96b
......@@ -48,7 +48,7 @@ static void i2c_dw_configure_fifo_master(struct dw_i2c_dev *dev)
static int i2c_dw_set_timings_master(struct dw_i2c_dev *dev)
u32 ic_clk = i2c_dw_clk_rate(dev);
const char *fp_str = "";
const char *mode_str, *fp_str = "";
u32 comp_param1;
u32 sda_falling_time, scl_falling_time;
int ret;
......@@ -132,7 +132,24 @@ static int i2c_dw_set_timings_master(struct dw_i2c_dev *dev)
return i2c_dw_set_sda_hold(dev);
ret = i2c_dw_set_sda_hold(dev);
if (ret)
goto out;
switch (dev->master_cfg & DW_IC_CON_SPEED_MASK) {
mode_str = "Standard Mode";
mode_str = "High Speed Mode";
mode_str = "Fast Mode";
dev_dbg(dev->dev, "Bus speed: %s%s\n", mode_str, fp_str);
return ret;
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