PCI: mobiveil: Fix devfn check in mobiveil_pcie_valid_device()

[ Upstream commit cbd50b3ca3964c79dac65fda277637577e029e8c ]

Current check for devfn number in mobiveil_pci_valid_device() is
wrong in that it flags as invalid functions present in PCI device 0
in the root bus while it is perfectly valid to access all functions
in PCI device 0 in the root bus.

Update the check in mobiveil_pci_valid_device() to fix the issue.

Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP driver")
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/pci/controller/pcie-mobiveil.c b/drivers/pci/controller/pcie-mobiveil.c
index dc228eb..476be4f 100644 (file)
--- a/drivers/pci/controller/pcie-mobiveil.c
+++ b/drivers/pci/controller/pcie-mobiveil.c
@@ -174,7 +174,7 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn)
         * Do not read more than one device on the bus directly
         * attached to RC
         */
-       if ((bus->primary == pcie->root_bus_nr) && (devfn > 0))
+       if ((bus->primary == pcie->root_bus_nr) && (PCI_SLOT(devfn) > 0))
                return false;
 
        return true;