• Michal Bachraty's avatar
    ASoC: davinci-mcasp: Add support for multichannel playback · 2952b27e
    Michal Bachraty authored
    Davinci McASP has support for I2S multichannel playback.
    For I2S playback/receive, each serializer is capable to play 2 channels
    (L/R) audio data.Serializer function (Playback-receive-none) is configured
    in DT, depending on hardware specification. It is possible to play less
    channels than configured in DT. For that purpose,only specific number of
    active serializers are enabled. McASP FIFO need to have DMA transfer Bcnt
    set to number of enabled serializers, otherwise no data are transfered to
    McASP and Alsa generates "DMA/IRQ playback write error (DMA or IRQ trouble?)"
    error. For TDM mode, McASP is capable to play or receive 32 channels for one
    serializer. McAsp has support for max 16 serializer, therefore max channels
    is 32 * 8.
    Signed-off-by: default avatarMichal Bachraty <michal.bachraty@streamunlimited.com>
    Tested-by: default avatarDaniel Mack <zonque@gmail.com>
    Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
    2952b27e
davinci-pcm.h 1.19 KB