On 02/03/2016 05:04 PM, Andreas Irestål wrote: > I've run into problems using the adau1361 codec (adau1761) as i2s master. > > I'm using i2c to set up the codec, and according to the datasheet there > is an enable bit, which must be set in order to be able to access any > other register than the first two registers. > > This enable bit is set when the codec enters bias level standby, > however, before entering this bias level, some other registers are > written which will have no effect due to the inner workings of this > codec. Oddly enough, it does ack all writes when measuring the i2c bus. > > One of these registers is the serial port 0 register, which > configures the i2s bus. This results in the situation that the CODEC dai > thinks it is running as i2s slave and the CPU dai thinks too as well, > and the bus is dead. Since the other register fields does not change > with our dai configuration, the register never gets physically updated > by an i2c write. > > If I reset/reboot the system, which in our case does not power cycle the > codec, the i2s bus is correctly set up and everything works as one would > expect. > > So, either the driver behaves incorrectly relying on bias level being > set before any other registers are written, or the underlying subsystem > are behaving incorrectly. We're using the simple-card board driver as it > is sufficient for our needs. Hi, Yes, that sounds like a bug in the driver. We probably need to enable the clock in the probe() function before we do any other register writes. - Lars _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
