AnsweredAssumed Answered

i.MX6SX failed to enable pcie

Question asked by Randy Silagi on Dec 7, 2016
Latest reply on Mar 15, 2017 by Mattias Barthel

I have the Saber i.MX6sx board and I can't get the PCIe to be enabled, that is lspci returns nothing.  The default kernel with this board has PCI disabled.  I have enabled PCI, PCIe, the Freescale i.MX6 PCIe controller,  PCIe RC mode, and PCI express Port bus support.  I have:  /sys/bus/pci/drivers::  ci_hdrc_pci  ehci-pci pcieport and /sys/bus/pci_express.  However /sys/bus/pci/devices is empty and lspci returns nothing. I expect to see the Root Complex bridge there, at least 0000:00:00.0.


Here is the list of errors I get during boot:


8ffc000.pcie supply pcie-bus not found, using dummy regulator
imx6q-pcie 8ffc000.pcie: phy link never came up

imx6q-pcie 8ffc000.pcie: failed to initialize host: ret: -22
imx6q-pcie: probe of 8ffc000.pcie failed with error -22


My questions are:

Why does devm_regulator_get(pp->dev,"pcie-bus")  fail?  Is that what causes imx6_pcie_link_up() to fail?  Then where does regulator_get find the name "pcie-bus"?  How does regulator_dev_lookup list of names get populated?


Thank you for reading and I greatly appreciate any help or ideas.


Randy Silagi