I get the error "aplay: set_params:1022: Unable to install hw
params:"
I have traced the problem to a failing ioctl call (snd_pcm_playback_ioctl) the error occurs in snd_pcm_hw_refine when refining the mask for the SNDRV_PCM_HW_PARAM_ACCESS mask, all the bit fields in my runtime->hw_constraints are zero for this field, but the
You should set these up with snd_soc_set_runtime_hwparams() with the flags in the info field.
requested params have the value 7, Im not sure what this means, the SNDRV_PCM_ACCESS_xxx defines in asound.h only go upto 4 ?
It's a bitmask at this point, treat those values as shifts.
Cheers, I wasn't setting the 'SNDRV_PCM_INFO_MMAP' in my snd_pcm_hardware description, because I didn't have MMAP support, I have now added MMAP support to my driver to resolve this issue, although I thought ALSA/aplay supported drivers without MMAP support ?
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