SNDRV_GF1_DMA_TRIGGER
gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER;
gus->gf1.dma_flags &= ~SNDRV_GF1_DMA_TRIGGER;
if (!(gus->gf1.dma_flags & SNDRV_GF1_DMA_TRIGGER)) {
gus->gf1.dma_flags |= SNDRV_GF1_DMA_TRIGGER;