[PATCH] PCI: Add ACS support for AMD A88X southbridge devices

[Marti Raudsepp <marti@juffo.org>]

AMD has confirmed that peer-to-peer between two southbridge functions
does not occur.

Joel Schopp at https://bugzilla.kernel.org/show_bug.cgi?id=81841#c15
>     +-14.4-[01]----05.0  Dialogic Corporation PRI
> The legacy PCI should be isolated from the other devices identified.
> Not sure what is going on here.
>
>     +-14.5  Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller
> This OHCI Controller should also be isolated from the other devices.

Signed-off-by: Marti Raudsepp <marti@juffo.org>
---
 drivers/pci/quirks.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 80c2d01..ce43316 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3582,6 +3582,11 @@ struct pci_dev *pci_get_dma_source(struct pci_dev *dev)
  * 1002:439d SB7x0/SB8x0/SB9x0 LPC host controller
  * 1002:4384 SBx00 PCI to PCI Bridge
  * 1002:4399 SB7x0/SB8x0/SB9x0 USB OHCI2 Controller
+ *
+ * https://bugzilla.kernel.org/show_bug.cgi?id=81841#c15
+ *
+ * 1022:780f [AMD] FCH PCI Bridge
+ * 1022:7809 [AMD] FCH USB OHCI Controller
  */
 static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags)
 {
@@ -3675,6 +3680,8 @@ static const struct pci_dev_acs_enabled {
 	{ PCI_VENDOR_ID_ATI, 0x439d, pci_quirk_amd_sb_acs },
 	{ PCI_VENDOR_ID_ATI, 0x4384, pci_quirk_amd_sb_acs },
 	{ PCI_VENDOR_ID_ATI, 0x4399, pci_quirk_amd_sb_acs },
+	{ PCI_VENDOR_ID_AMD, 0x780f, pci_quirk_amd_sb_acs },
+	{ PCI_VENDOR_ID_AMD, 0x7809, pci_quirk_amd_sb_acs },
 	{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_pch_acs },
 	{ 0 }
 };
-- 
2.1.1