Jon, On Sonntag, 24. Mai 2009, Jon Smirl wrote: > On Sun, May 24, 2009 at 2:55 PM, Wolfram Sang <w.sang@xxxxxxxxxxxxxx> wrote: > >> Rewrite the mpc5200 audio DMA code to support both I2S and AC97. Make it > >> more robust. > > > > Why is it more robust? > > I've implemented retries for when the AC97 hardware doesn't reset on > first try. About 10% of the time both the Efika and pcm030 AC97 codecs > don't reset on first try and need to be poked multiple times. Failure > is indicated by not having the link clock start ticking. Every once in > a while even five pokes won't get the link started and I have to power > cycle. Do you know this (from our website)? "The AC97 mixer needs a hardware patch to make it wake up from power down mode. Download here the instruction how to do so." http://www.pengutronix.de/oselas/bsp/phytec/download/phyCORE-MPC5200B-tiny/TN-015e_1.pdf jbe -- Pengutronix e.K. | Juergen Beisert | Linux Solutions for Science and Industry | Phone: +49-8766-939 228 | Vertretung Sued/Muenchen, Germany | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de/ | _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
