[PATCH v5 08/12] PCI: endpoint: Handle 64-bit BARs properly

[Niklas Cassel <niklas.cassel@axis.com>]

If a 64-bit BAR was set-up, we need to skip a BAR,
since a 64-bit BAR consists of a BAR pair.

We need to check what BAR width the epc->ops->set_bar() specific
implementation actually did set-up, since some drivers, like the
Cadence EP controller, sometimes sets up a 64-bit BAR, even though
a 32-bit BAR was requested.

Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
---
 drivers/pci/endpoint/functions/pci-epf-test.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 91274779e59f..d46e3ebabb8e 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -380,6 +380,13 @@ static int pci_epf_test_set_bar(struct pci_epf *epf)
 			if (bar == test_reg_bar)
 				return ret;
 		}
+		/*
+		 * pci_epc_set_bar() sets PCI_BASE_ADDRESS_MEM_TYPE_64
+		 * if the specific implementation required a 64-bit BAR,
+		 * even if we only requested a 32-bit BAR.
+		 */
+		if (epf_bar->flags & PCI_BASE_ADDRESS_MEM_TYPE_64)
+			bar++;
 	}
 
 	return 0;
-- 
2.14.2