i2c: designware_i2c: Add a little more debugging

Add debugging for a few more values and also use log to show return values
when something goes wrong. This makes it easier to see the root cause.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
1 file changed