[PATCHv4 18/28] PCI: mobiveil: add link up condition check
From: "Z.q. Hou" <zhiqiang.hou@nxp.com>
Date: 2019-03-11 09:32:32
Also in:
linux-devicetree, linux-pci, lkml
Subsystem:
pci driver for mobiveil pcie ip, pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Karthikeyan Mitran, Hou Zhiqiang, Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> Avoid to issue CFG transactions to link partner when the PCIe link is not up. Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> --- V4: - Splited from the 17th patch drivers/pci/controller/mobiveil/pcie-mobiveil-host.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
index 74a14f05115e..1ae82e790562 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil-host.c@@ -29,6 +29,10 @@ static bool mobiveil_pcie_valid_device(struct pci_bus *bus, unsigned int devfn) { struct mobiveil_pcie *pcie = bus->sysdata; + /* If there is no link, then there is no device */ + if (bus->number > pcie->rp.root_bus_nr && !mobiveil_pcie_link_up(pcie)) + return false; + /* Only one device down on each root port */ if ((bus->number == pcie->rp.root_bus_nr) && (devfn > 0)) return false;
--
2.17.1
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