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voodoo_pci: Change readback value of PCI config 0x40 based on voodoo card type. Fixes MT06874.

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This commit is contained in:
Ted Green 2018-09-02 14:10:09 -06:00
parent 95dc6bbe18
commit 0136cba5b5
1 changed files with 7 additions and 3 deletions
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10
src/devices/video/voodoo_pci.cpp
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@ -203,9 +203,13 @@ READ32_MEMBER (voodoo_pci_device::pcictrl_r)
// The address map starts at 0x40
switch (offset + 0x40 / 4) {
case 0x40/4:
// V2: Init Enable: 19:16=Fab ID, 15:12=Graphics Rev
// Vegas driver needs this value at PCI 0x40
result = 0x00044000;
// V1: initEnable: 11:0
// V2: initEnable: Fab ID=19:16, Graphics Rev=15:12
// Banshee/V3: fabID: ScratchPad=31:4 fabID=3:0
if (m_voodoo->vd_type== TYPE_VOODOO_2)
result = (result & ~0xff000) | 0x00044000; // Vegas driver needs this value
else if (m_voodoo->vd_type >= TYPE_VOODOO_BANSHEE)
result = (result & ~0xf) | 0x1;
break;
case 0x54/4:
// V2: SiProcess Register: Osc Force On, Osc Ring Sel, Osc Count Reset, 12 bit PCI Counter, 16 bit Oscillator Counter