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ALSA: au88x0 - Modify pointer callback to give accurate playback position

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Signed-off-by: Raymond Yau <superquad.vortex2@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Raymond Yau 2011-02-14 07:33:24 +08:00 committed by Takashi Iwai
parent 6146124118
commit 5e5677f239
1 changed files with 11 additions and 3 deletions
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14
sound/pci/au88x0/au88x0_core.c
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@ -1252,11 +1252,19 @@ static void vortex_adbdma_resetup(vortex_t *vortex, int adbdma) {
static int inline vortex_adbdma_getlinearpos(vortex_t * vortex, int adbdma)
{
stream_t *dma = &vortex->dma_adb[adbdma];
int temp;
int temp, page, delta;
temp = hwread(vortex->mmio, VORTEX_ADBDMA_STAT + (adbdma << 2));
temp = (dma->period_virt * dma->period_bytes) + (temp & (dma->period_bytes - 1));
return temp;
page = (temp & ADB_SUBBUF_MASK) >> ADB_SUBBUF_SHIFT;
if (dma->nr_periods >= 4)
delta = (page - dma->period_real) & 3;
else {
delta = (page - dma->period_real);
if (delta < 0)
delta += dma->nr_periods;
}
return (dma->period_virt + delta) * dma->period_bytes
+ (temp & (dma->period_bytes - 1));
}
static void vortex_adbdma_startfifo(vortex_t * vortex, int adbdma)