diff mbox series

[PATCHv4,18/28] PCI: mobiveil: add link up condition check

Message ID 20190311093130.7209-19-Zhiqiang.Hou@nxp.com (mailing list archive)
State Superseded, archived
Headers show
Series PCI: refactor Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs | expand

Commit Message

Z.Q. Hou March 11, 2019, 9:32 a.m. UTC 
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 mbox series

Patch

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;