Re: [alsa-devel] [PATCH 2/3] ALSA SoC: Add mpc5200-psc I2S driver

On Mon, Jul 07, 2008 at 09:23:24AM -0400, Jon Smirl wrote:

On 7/7/08, Mark Brown [off-list ref] wrote:

quoted

On Sun, Jul 06, 2008 at 01:56:48PM -0400, Jon Smirl wrote:

 > The driver is assuming a capture stream exists. My codec is output only.


While the driver declares a capture stream the core doesn't require that
 both capture and playback be available - it will cope with a capture
 only or a playback only DAI (this is fairly common due to DAC only and
 ADC only parts).  Unless there's some other issue specific to this
 driver?

Yes, it GPFs allocating a a DMA buffer on the null capture stream pointer.

Where does it GPF?  When dereferencing pcm->streams[x].substream in
psc_i2s_pcm_new?