[PATCH 2/2] ac97: don't override the pci subsystem id

[Gerd Hoffmann <kraxel@xxxxxxxxxx>]

This patch removes the code lines which set the subsystem id for the
emulated ac97 card to 8086:0000.  Due to the device id being zero the
subsystem id isn't vaild anyway.  With the patch applied the sound card
gets the default qemu subsystem id (1af4:1100) instead.

[ v2: old & broken id is maintained for -M pc-$oldqemuversion ]

Cc: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
---
 hw/ac97.c    |   16 +++++++++++-----
 hw/pc_piix.c |   16 ++++++++++++++++
 2 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/hw/ac97.c b/hw/ac97.c
index 6800af4..0dbba3b 100644
--- a/hw/ac97.c
+++ b/hw/ac97.c
@@ -150,6 +150,7 @@ typedef struct AC97BusMasterRegs {
 typedef struct AC97LinkState {
     PCIDevice dev;
     QEMUSoundCard card;
+    uint32_t use_broken_id;
     uint32_t glob_cnt;
     uint32_t glob_sta;
     uint32_t cas;
@@ -1305,11 +1306,12 @@ static int ac97_initfn (PCIDevice *dev)
     c[PCI_BASE_ADDRESS_0 + 6] = 0x00;
     c[PCI_BASE_ADDRESS_0 + 7] = 0x00;
 
-    c[PCI_SUBSYSTEM_VENDOR_ID] = 0x86;      /* svid subsystem vendor id rwo */
-    c[PCI_SUBSYSTEM_VENDOR_ID + 1] = 0x80;
-
-    c[PCI_SUBSYSTEM_ID] = 0x00;      /* sid subsystem id rwo */
-    c[PCI_SUBSYSTEM_ID + 1] = 0x00;
+    if (s->use_broken_id) {
+        c[PCI_SUBSYSTEM_VENDOR_ID] = 0x86;
+        c[PCI_SUBSYSTEM_VENDOR_ID + 1] = 0x80;
+        c[PCI_SUBSYSTEM_ID] = 0x00;
+        c[PCI_SUBSYSTEM_ID + 1] = 0x00;
+    }
 
     c[PCI_INTERRUPT_LINE] = 0x00;      /* intr_ln interrupt line rw */
     c[PCI_INTERRUPT_PIN] = 0x01;      /* intr_pn interrupt pin ro */
@@ -1350,6 +1352,10 @@ static PCIDeviceInfo ac97_info = {
     .device_id    = PCI_DEVICE_ID_INTEL_82801AA_5,
     .revision     = 0x01,
     .class_id     = PCI_CLASS_MULTIMEDIA_AUDIO,
+    .qdev.props   = (Property[]) {
+        DEFINE_PROP_UINT32("use_broken_id", AC97LinkState, use_broken_id, 0),
+        DEFINE_PROP_END_OF_LIST(),
+    }
 };
 
 static void ac97_register (void)
diff --git a/hw/pc_piix.c b/hw/pc_piix.c
index 93e40d0..27ea570 100644
--- a/hw/pc_piix.c
+++ b/hw/pc_piix.c
@@ -347,6 +347,10 @@ static QEMUMachine pc_machine_v0_13 = {
             .driver   = "virtio-net-pci",
             .property = "event_idx",
             .value    = "off",
+        },{
+            .driver   = "AC97",
+            .property = "use_broken_id",
+            .value    = stringify(1),
         },
         { /* end of list */ }
     },
@@ -390,6 +394,10 @@ static QEMUMachine pc_machine_v0_12 = {
             .driver   = "virtio-net-pci",
             .property = "event_idx",
             .value    = "off",
+        },{
+            .driver   = "AC97",
+            .property = "use_broken_id",
+            .value    = stringify(1),
         },
         { /* end of list */ }
     }
@@ -441,6 +449,10 @@ static QEMUMachine pc_machine_v0_11 = {
             .driver   = "virtio-net-pci",
             .property = "event_idx",
             .value    = "off",
+        },{
+            .driver   = "AC97",
+            .property = "use_broken_id",
+            .value    = stringify(1),
         },
         { /* end of list */ }
     }
@@ -504,6 +516,10 @@ static QEMUMachine pc_machine_v0_10 = {
             .driver   = "virtio-net-pci",
             .property = "event_idx",
             .value    = "off",
+        },{
+            .driver   = "AC97",
+            .property = "use_broken_id",
+            .value    = stringify(1),
         },
         { /* end of list */ }
     },
-- 
1.7.1

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