Matt Flax <flatmax@xxxxxxxxxxx> writes: > This patch adds multitrack capability if in DSP mode A and the > codec is master. > > In bcm2835_i2s_startup, snd_pcm_hw_constraint_single is used to set > channels to 8 if both SND_SOC_DAIFMT_CBM_CFM and SND_SOC_DAIFMT_DSP_A > are set. Otherwise, channels are set to 2. These settings are > accomplished using the SNDRV_PCM_HW_PARAM_CHANNELS variable. > > In bcm2835_i2s_shutdown the channels are set to 2 by default. > > In bcm2835_i2s_hw_params, DSP mode A format is now an option. > Before replicating the format variable (from ch2 to ch1) for > register loading, requested channels are checked to be either 2 or 8. > This can be expanded later to accomodate other channel counts if > supported by the sound card hardware. > > Signed-off-by: Matt Flax <flatmax@xxxxxxxxxxx> Acked-by: Eric Anholt <eric@xxxxxxxxxx>
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