loop in i2c_imx_acked() in low bit rates it takes some time until the
ACK comes in.
Also add a delay before polling for bus not busy in i2c_imx_read.
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
During i2c read the original pattern was:
1. write i2c slave address
2. wait for transmit complete + clear IIF
3. wait for receive acknowledge
4. wait for IIF interrupt
Due to the clear of the I2SR register, the IIF flag was cleared, too. So
in step 4 the Interrupt wasn't detected. To fix this problem, we move
the clean of IIF before the writing of the slave address. So that it
looks this way:
0. clear IIF
1. write i2c slave address
2. wait for transmit complete
3. wait for receive acknowledge
4. wait for IIF interrupt
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Eric Bénard
Marc Kleine-Budde