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intel-hda: fix position buffer 

Fix position buffer updates to use the correct stream offset.

Without this patch both IN (record) and OUT (playback) streams
will update the IN buffer positions.  The linux kernel notices
and complains:
  hda-intel: Invalid position buffer, using LPIB read method instead.

The bug may also lead to glitches when recording and playing
at the same time:
  https://bugzilla.redhat.com/show_bug.cgi?id=947785

Cc: qemu-stable@nongnu.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit d58ce68a45)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Gerd Hoffmann 2013-11-29 14:25:33 +01:00 committed by Michael Roth
parent 30a08ab4e1
commit 97f74de48c
1 changed files with 1 additions and 0 deletions
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1
hw/audio/intel-hda.c
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@ -444,6 +444,7 @@ static bool intel_hda_xfer(HDACodecDevice *dev, uint32_t stnr, bool output,
}
}
if (d->dp_lbase & 0x01) {
s = st - d->st;
addr = intel_hda_addr(d->dp_lbase & ~0x01, d->dp_ubase);
stl_le_pci_dma(&d->pci, addr + 8*s, st->lpib);
}