Skip to content

Commit

Permalink
PCI quirk: RS780/RS880: disable MSI behind the PCI bridge
Browse files Browse the repository at this point in the history
The missing initialization of the nb_cntl.strap_msi_enable does not
seem to be the only problem that prevents MSI, so that quirk is not
sufficient to enable MSI on all machines.  To be safe, disable MSI
unconditionally for the internal graphics and HDMI audio on these
chipsets.

[rjw: Added the PCI_VENDOR_ID_AI quirk.]

Signed-off-by: Clemens Ladisch <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
  • Loading branch information
cladisch authored and torvalds committed Apr 3, 2010
1 parent 5e123e5 commit 5193d7a
Showing 1 changed file with 3 additions and 33 deletions.
36 changes: 3 additions & 33 deletions drivers/pci/quirks.c
Original file line number Diff line number Diff line change
Expand Up @@ -2123,6 +2123,9 @@ static void __devinit quirk_disable_msi(struct pci_dev *dev)
}
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8131_BRIDGE, quirk_disable_msi);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD, 0x9602, quirk_disable_msi);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASUSTEK, 0x9602, quirk_disable_msi);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AI, 0x9602, quirk_disable_msi);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, 0xa238, quirk_disable_msi);

/* Go through the list of Hypertransport capabilities and
Expand Down Expand Up @@ -2495,39 +2498,6 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x4374,
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x4375,
quirk_msi_intx_disable_bug);

/*
* MSI does not work with the AMD RS780/RS880 internal graphics and HDMI audio
* devices unless the BIOS has initialized the nb_cntl.strap_msi_enable bit.
*/
static void __init rs780_int_gfx_disable_msi(struct pci_dev *int_gfx_bridge)
{
u32 nb_cntl;

if (!int_gfx_bridge->subordinate)
return;

pci_bus_write_config_dword(int_gfx_bridge->bus, PCI_DEVFN(0, 0),
0x60, 0);
pci_bus_read_config_dword(int_gfx_bridge->bus, PCI_DEVFN(0, 0),
0x64, &nb_cntl);

if (!(nb_cntl & BIT(10))) {
dev_warn(&int_gfx_bridge->dev,
FW_WARN "RS780: MSI for internal graphics disabled\n");
int_gfx_bridge->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
}
}

#define PCI_DEVICE_ID_AMD_RS780_P2P_INT_GFX 0x9602

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AMD,
PCI_DEVICE_ID_AMD_RS780_P2P_INT_GFX,
rs780_int_gfx_disable_msi);
/* wrong vendor ID on M4A785TD motherboard: */
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASUSTEK,
PCI_DEVICE_ID_AMD_RS780_P2P_INT_GFX,
rs780_int_gfx_disable_msi);

#endif /* CONFIG_PCI_MSI */

#ifdef CONFIG_PCI_IOV
Expand Down

0 comments on commit 5193d7a

Please sign in to comment.