[PATCH 1/6] pci: mvebu: provide a compliant PCI configuration space
From: Russell King <hidden>
Date: 2015-09-23 17:17:26
Also in:
linux-pci
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
PCI requires reads to reserved or unimplemented configuration space to return zero and complete normally. However, the root port software implementation was returning 0xfffffff and PCIBIOS_BAD_REGISTER_NUMBER. Fix this. Signed-off-by: Russell King <redacted> --- drivers/pci/host/pci-mvebu.c | 9 +++++++-- 1 file 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)
--
2.1.0