Commit bdd03b88 authored by Jaroslav Kysela's avatar Jaroslav Kysela

[ALSA] Fix DMA pointer read

ATIIXP driver
Try to reread DMA pointer register if the value is invalid.
The register shows bogus values on some broken hardwares.
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent ffcce5e2
......@@ -630,21 +630,20 @@ static snd_pcm_uframes_t snd_atiixp_pcm_pointer(snd_pcm_substream_t *substream)
snd_pcm_runtime_t *runtime = substream->runtime;
atiixp_dma_t *dma = (atiixp_dma_t *)runtime->private_data;
unsigned int curptr;
int timeout = 1000;
spin_lock(&chip->reg_lock);
while (timeout--) {
curptr = readl(chip->remap_addr + dma->ops->dt_cur);
if (curptr < dma->buf_addr) {
snd_printdd("curptr = %x, base = %x\n", curptr, dma->buf_addr);
curptr = 0;
} else {
if (curptr < dma->buf_addr)
continue;
curptr -= dma->buf_addr;
if (curptr >= dma->buf_bytes) {
snd_printdd("curptr = %x, size = %x\n", curptr, dma->buf_bytes);
curptr = 0;
}
}
spin_unlock(&chip->reg_lock);
if (curptr >= dma->buf_bytes)
continue;
return bytes_to_frames(runtime, curptr);
}
snd_printd("atiixp: invalid DMA pointer read 0x%x (buf=%x)\n",
readl(chip->remap_addr + dma->ops->dt_cur), dma->buf_addr);
return 0;
}
/*
......
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