[pulseaudio-tickets] [Bug 87395] tsched disabled when I use module-alsa-sink with 'mmap=0 tsched=1' parameters.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87395

--- Comment #11 from Raymond <superquad.vortex2 at gmail.com> ---
timer scheduling is disabled when

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/src/modules/alsa?id=826c8f69d34ef49e86fe0ab6c93c1ffba8916131

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/commit/sound/soc/soc-generic-dmaengine-pcm.c?id=478028e088d6a94666d8a776be2cd2291faf3bbd

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/include/linux/dmaengine.h



DMA_RESIDUE_GRANULARITY_BURST: Residue is updated after each transferred
 *  burst. This is typically only supported if the hardware has a progress
 *  register of some sort (E.g. a register with the current read/write address
 *  or a register with the amount of bursts/beats/bytes that have been
 *  transferred or still need to be transferred).
 */
enum dma_residue_granularity {
    DMA_RESIDUE_GRANULARITY_DESCRIPTOR = 0,
    DMA_RESIDUE_GRANULARITY_SEGMENT = 1,
    DMA_RESIDUE_GRANULARITY_BURST = 2,
};

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