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i2c: designware: Add debug print for SDA hold time value 

SDA hold time is an important timing parameter and often reason for
arbitration lost errors if not set to a correct value. Add a debug print
for it in order to see what value gets programmed to 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 14:23:24 +03:00 committed by Wolfram Sang
parent 56b637b5b2
commit 1706a96b30
1 changed files with 4 additions and 0 deletions
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4
drivers/i2c/busses/i2c-designware-common.c
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@ -210,6 +210,10 @@ int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev)
*/
if (!(dev->sda_hold_time & DW_IC_SDA_HOLD_RX_MASK))
dev->sda_hold_time |= 1 << DW_IC_SDA_HOLD_RX_SHIFT;
dev_dbg(dev->dev, "SDA Hold Time TX:RX = %d:%d\n",
dev->sda_hold_time & ~(u32)DW_IC_SDA_HOLD_RX_MASK,
dev->sda_hold_time >> DW_IC_SDA_HOLD_RX_SHIFT);
} else if (dev->sda_hold_time) {
dev_warn(dev->dev,
"Hardware too old to adjust SDA hold time.\n");