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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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Jarkko Nikula 2018-06-19 14:23:25 +03:00 committed by Wolfram Sang
parent 1706a96b30
commit d07bdbc02c
1 changed files with 19 additions and 2 deletions
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21
drivers/i2c/busses/i2c-designware-master.c
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@ -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) {
case DW_IC_CON_SPEED_STD:
mode_str = "Standard Mode";
break;
case DW_IC_CON_SPEED_HIGH:
mode_str = "High Speed Mode";
break;
default:
mode_str = "Fast Mode";
}
dev_dbg(dev->dev, "Bus speed: %s%s\n", mode_str, fp_str);
out:
return ret;
}
/**