There was mistake in commit 4cd61c43fd51 ("arm: a37xx: pci: Fix handling
PIO config error responses"). U-Boot does not support handling of CRS
return value for PCI_VENDOR_ID config read request and also does not set
CRSSVE bit.
Therefore disable returning CRS response for now.
Signed-off-by: Pali Rohár <p...@kernel.org>
Fixes: 4cd61c43fd51 ("arm: a37xx: pci: Fix handling PIO config error responses")
---
drivers/pci/pci-aardvark.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pci-aardvark.c b/drivers/pci/pci-aardvark.c
index 815b26162f15..d3ef8f203d97 100644
--- a/drivers/pci/pci-aardvark.c
+++ b/drivers/pci/pci-aardvark.c
@@ -358,7 +358,18 @@ static int pcie_advk_read_config(const struct udevice
*bus, pci_dev_t bdf,
return 0;
}
- allow_crs = (offset == PCI_VENDOR_ID) && (size == 4);
+ /*
+ * Returning fabricated CRS value (0xFFFF0001) by PCIe Root Complex to
+ * OS is allowed only for 4-byte PCI_VENDOR_ID config read request and
+ * only when CRSSVE bit in Root Port PCIe device is enabled. In all
+ * other error PCIe Root Complex must return all-ones.
+ * Aardvark HW does not have Root Port PCIe device and U-Boot does not
+ * implement emulation of this device.
+ * U-Boot currently does not support handling of CRS return value for
+ * PCI_VENDOR_ID config read request and also does not set CRSSVE bit.
+ * Therefore disable returning CRS response for now.
+ */
+ allow_crs = false;
if (advk_readl(pcie, PIO_START)) {
dev_err(pcie->dev,
--
2.20.1
