On Mon, Mar 9, 2009 at 4:03 PM, Liam Girdwood <lrg@xxxxxxxxxx> wrote: > On Mon, 2009-03-09 at 15:47 +0100, pHilipp Zabel wrote: >> Ok, >> >> I'm not sure how to handle this correctly. >> >> Magician needs stereo S16_LE input data from alsa, DAIFMT_DSP_A on the >> wire with a frame size of 16 bit (one frame for each channel) and thus >> 2-byte DMA transfers to the FIFO (currently called 'mono' DMA params). >> Zylonite's current code uses 32 bit frame size and 4-byte DMA >> transfers to emulate I2S (S16_LE,stereo). Network mode seems to work, >> so it could be changed to use two 16 bit slots instead with 2-byte DMA >> transfers (which would make Magician happy). But... >> Daniel's board needs very strange settings because network mode >> doesn't work, so I guess he can't use 2-byte DMA transfers. Is that >> correct? >> >> If we can't find a way to have all machines use the mono DMA params, >> there has to be some kind of interface to set the width of the data in >> the FIFO independently from the Alsa format. How should that interface >> look like? > > Btw, what pxa processor variants are you and Daniel using ? > > Iirc, PXA3x SSP is quite different in terms of "usability" compared to > to PXA2x SSP. It might be worth diverging the SSP code a little here if > your CPUs are different. PXA272 in my case, but I share Mark's hope of keeping it unified. regards Philipp _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
