x86/pci/mrst: force all pci config access toward 0:0:0, 0:2:0 and 0:3:0 to type
1
For real pci devices 0:0:0, 0:2:0 and 0:3:0, there is either no pci shim, or
no guarantee of data correctness of offset 256-4k. So for whatever reason,
Linux kernel should not do MMCFG pci config access to those devices. Instead,
always use type 1 for those devices.
Signed-off-by: Bin Gao <bin....@linux.intel.com>
---
arch/x86/pci/mrst.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/x86/pci/mrst.c b/arch/x86/pci/mrst.c
index 6eb18c4..0e0fabf 100644
--- a/arch/x86/pci/mrst.c
+++ b/arch/x86/pci/mrst.c
@@ -141,6 +141,11 @@ static int pci_device_update_fixed(struct pci_bus *bus,
unsigned int devfn,
*/
static bool type1_access_ok(unsigned int bus, unsigned int devfn, int reg)
{
+ if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
+ || devfn == PCI_DEVFN(0, 0)
+ || devfn == PCI_DEVFN(3, 0)))
+ return 1;
+
/* This is a workaround for A0 LNC bug where PCI status register does
* not have new CAP bit set. can not be written by SW either.
*
@@ -150,10 +155,7 @@ static bool type1_access_ok(unsigned int bus, unsigned int
devfn, int reg)
*/
if (reg >= 0x100 || reg == PCI_STATUS || reg == PCI_HEADER_TYPE)
return 0;
- if (bus == 0 && (devfn == PCI_DEVFN(2, 0)
- || devfn == PCI_DEVFN(0, 0)
- || devfn == PCI_DEVFN(3, 0)))
- return 1;
+
return 0; /* langwell on others */
}
--
1.7.4.4
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