On Mon, Jan 11, 2010 at 11:36:31AM +0000, Mark Brown wrote: > On Mon, Jan 11, 2010 at 12:20:47PM +0100, Sascha Hauer wrote: > > > Why this limitation? I can successfully record with 16000Hz while > > playing at 48000Hz on my PCM037 board. What is missing in the driver to > > 'officially' support asymmetric rates? > > At least some of the driver was unconditionally setting both TX and RX > configuration simultaneously, though looking again hw_params() is OK. You probably mean imx_ssi_set_dai_fmt(), imx_ssi_set_dai_tdm_slot() and imx_ssi_set_dai_sysclk(). We do not have the playback/record information available in these functions. Should we pass a struct snd_pcm_substream * to the functions? > I'll drop the patch. Like I say, I've never actually seen the driver > working - even when configured as the master it doesn't seem to do any > DMA (well, FIQs). Unfortunately I do not have a mx31ads available, so I can't provide a driver for this board. I never used master mode, but if I understand the datasheet correctly the SSI unit has two clock inputs, one for the register accesses which gets enabled by clk_enable and one for the baud rate which doesn't get touched by the driver atm. Have you checked that the baud clock is configured correctly? If you have by chance a mx27ads or a mx35 3stack board I could see that I make the driver work on one of these boards. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
