- ptr3 = snd_ca0106_ptr_read(emu, PLAYBACK_LIST_PTR, channel);
- ptr1 = snd_ca0106_ptr_read(emu, PLAYBACK_POINTER, channel);
- ptr4 = snd_ca0106_ptr_read(emu, PLAYBACK_LIST_PTR, channel);
- if (ptr3 != ptr4) ptr1 = snd_ca0106_ptr_read(emu, PLAYBACK_POINTER, channel);
- ptr2 = bytes_to_frames(runtime, ptr1);
- ptr2+= (ptr4 >> 3) * runtime->period_size;
- ptr=ptr2;
- if (ptr >= runtime->buffer_size)
- ptr -= runtime->buffer_size;
- /*
- printk(KERN_DEBUG "ptr1 = 0x%lx, ptr2=0x%lx, ptr=0x%lx, "
- "buffer_size = 0x%x, period_size = 0x%x, bits=%d, rate=%d\n",
- ptr1, ptr2, ptr, (int)runtime->buffer_size,
- (int)runtime->period_size, (int)runtime->frame_bits,
- (int)runtime->rate);
- */
- return ptr;
+ prev_ptr = -1;
+ do {
+ ptr = snd_ca0106_ptr_read(emu, PLAYBACK_LIST_PTR, channel);
+ ptr = (ptr >> 3) * runtime->period_size;
+ ptr += bytes_to_frames(runtime,
+ snd_ca0106_ptr_read(emu, PLAYBACK_POINTER, channel));
+ if (ptr >= runtime->buffer_size)
+ ptr -= runtime->buffer_size;
+ if (prev_ptr == ptr)
+ return ptr;
+ prev_ptr = ptr;
+ } while (--timeout);
+ snd_printk(KERN_WARNING "ca0106: unstable DMA pointer!\n");
+ return 0;