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.
Signed-off-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
---
drivers/i2c/busses/i2c-designware-common.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c
index 1b542d3e5a2e..1742f1910cfd 100644
--- a/drivers/i2c/busses/i2c-designware-common.c
+++ b/drivers/i2c/busses/i2c-designware-common.c
@@ -209,6 +209,10 @@ void 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");
--
2.17.0
