From d07bdbc02cdf9930da5f4b8b502c8b33a6d29fcf Mon Sep 17 00:00:00 2001 From: Jarkko Nikula Date: Tue, 19 Jun 2018 14:23:25 +0300 Subject: 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 Signed-off-by: Jarkko Nikula Signed-off-by: Wolfram Sang --- drivers/i2c/busses/i2c-designware-master.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) (limited to 'drivers/i2c/busses/i2c-designware-master.c') diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c index 2b671ca3f972..fc7c255c80af 100644 --- a/drivers/i2c/busses/i2c-designware-master.c +++ b/drivers/i2c/busses/i2c-designware-master.c @@ -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; } /** -- cgit v1.2.3-55-g7522