On Thu, 11 Mar 2010 16:55:12 +0200 Peter Ujfalusi <peter.ujfalusi@xxxxxxxxx> wrote: > > Just curious: what would happen if the BCLK is cut while the McBSP is > > operating? > > The symptom is that we can not access to McBSP register address space causing > kernel panic, which can only be fixed by rebooting the device. > The burst driven BCLK causes some internal state machine to stuck, leaving the > given McBSP port dead from the outside. Other ports operate after this event. > Obviously this only bites in McBSP slave mode, and with codec like DAC33 which > have burst mode, in other cases the BCLK is always running (or McBSP is master). > > > I'm thinking are there also other similar problems, e.g. if > > the rate is not correct. > > Hmmm, could be possible, but I did not experienced with such a problem. > Thanks for sharing this info. Sounds exactly similar problem what I encountered once with the OMAP2420 and EAC. I didn't debug that problem any further then but there also some register accesses (not all) caused kernel panic if the external clock was missing or if the rate wasn't correct. -- Jarkko _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
