From 91bcfcc9583a61158f7f69f52ff3575eb432067f Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 11 Dec 2013 09:49:07 -0500
Subject: [PATCH 01/14] intel-hda: fix position buffer

Message-id: <1386755347-9800-2-git-send-email-kraxel@redhat.com>
Patchwork-id: 56156
O-Subject: [RHEL-7 qemu-kvm PATCH 1/1] intel-hda: fix position buffer
Bugzilla: 947785
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
RH-Acked-by: Orit Wasserman <owasserm@redhat.com>

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 d58ce68a454e5ae9cbde0308def379e272f13b10)
---
 hw/audio/intel-hda.c | 1 +
 1 file changed, 1 insertion(+)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/audio/intel-hda.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/audio/intel-hda.c b/hw/audio/intel-hda.c
index e747342..cc948de 100644
--- a/hw/audio/intel-hda.c
+++ b/hw/audio/intel-hda.c
@@ -439,6 +439,7 @@ 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);
     }
-- 
1.8.3.1