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| author | Ben Dooks <ben.dooks@codethink.co.uk> | 2014-02-18 06:11:11 +0400 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-02-19 00:19:59 +0400 |
| commit | e64a2a973e179613489a0ddb1bb550dff108164e (patch) | |
| tree | 5c954dab4c948da5d24950eb81aeabe63763ab60 /drivers/pci | |
| parent | 80a595d941a2ce2953e6c77d822d8a4c3d8fa5a0 (diff) | |
| download | linux-e64a2a973e179613489a0ddb1bb550dff108164e.tar.xz | |
PCI: rcar: Fix bridge logic configuration accesses
The bridge logic at slot 0 only supports reads up to 0x40 and the rest of
the PCI configuration space for this slot is marked as reserved in the
manual.
Trying a read from offset 0x100 is producing an error from the bridge. With
error interrupts enabled, the following is printed:
pci-rcar-gen2 ee0d0000.pci: error irq: status 00000014
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/host/pci-rcar-gen2.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/pci/host/pci-rcar-gen2.c b/drivers/pci/host/pci-rcar-gen2.c index 11e444e79f45..6288476576a7 100644 --- a/drivers/pci/host/pci-rcar-gen2.c +++ b/drivers/pci/host/pci-rcar-gen2.c @@ -119,6 +119,10 @@ static void __iomem *rcar_pci_cfg_base(struct pci_bus *bus, unsigned int devfn, if (slot > 2) return NULL; + /* bridge logic only has registers to 0x40 */ + if (slot == 0x0 && where >= 0x40) + return NULL; + val = slot ? RCAR_AHBPCI_WIN1_DEVICE | RCAR_AHBPCI_WIN_CTR_CFG : RCAR_AHBPCI_WIN1_HOST | RCAR_AHBPCI_WIN_CTR_CFG; |