diff options
| author | Jarkko Nikula <jarkko.nikula@linux.intel.com> | 2018-06-19 14:23:25 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2018-07-03 23:06:19 +0200 |
| commit | d07bdbc02cdf9930da5f4b8b502c8b33a6d29fcf (patch) | |
| tree | a339a95fa298a17fdbabba5d88d4a33211588fb3 /drivers/i2c | |
| parent | 1706a96b30d6011e3f6829b365ace2030a306fe3 (diff) | |
| download | linux-d07bdbc02cdf9930da5f4b8b502c8b33a6d29fcf.tar.bz2 | |
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-master.c | 21 |
1 files changed, 19 insertions, 2 deletions
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; } /** |