diff options
| author | Russell King <[email protected]> | 2015-09-23 18:17:26 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <[email protected]> | 2015-10-08 11:07:54 -0500 |
| commit | 58c19a140de555b2bef41b8bf95439c36d555836 (patch) | |
| tree | 58efc8c162df04e8ab055b2e7e292c3bca6c39b0 | |
| parent | 6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f (diff) | |
PCI: mvebu: Return zero for reserved or unimplemented config space
PCI requires reads to reserved or unimplemented configuration space to
return zero and complete normally (see PCI r3.0, sec 6.1). However, the
root port software implementation was returning 0xfffffff and
PCIBIOS_BAD_REGISTER_NUMBER.
Return zero when reading reserved or unimplemented config space.
[bhelgaas: changelog]
Tested-by: Thomas Petazzoni <[email protected]> (Armada XP GP)
Tested-by: Andrew Lunn <[email protected]> (Kirkwood DIR665)
Signed-off-by: Russell King <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Thomas Petazzoni <[email protected]>
| -rw-r--r-- | drivers/pci/host/pci-mvebu.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c index 67ec5e1c99db..b6a096bc9422 100644 --- a/drivers/pci/host/pci-mvebu.c +++ b/drivers/pci/host/pci-mvebu.c @@ -515,8 +515,13 @@ static int mvebu_sw_pci_bridge_read(struct mvebu_pcie_port *port, break; default: - *value = 0xffffffff; - return PCIBIOS_BAD_REGISTER_NUMBER; + /* + * PCI defines configuration read accesses to reserved or + * unimplemented registers to read as zero and complete + * normally. + */ + *value = 0; + return PCIBIOS_SUCCESSFUL; } if (size == 2) |