iMX8Q evaluation board PCIe boot failure

[jimdai]

Right now we are working on iMX8 PCIe link. Without any PCIe device inserted in the iMX8Q evaluation board, we can get PCIe related message as below when boot up:

[    0.910397] 5f010000.pcie supply epdev_on not found, using dummy regulator

[    0.917200] OF: PCI: host bridge /pcie@0x5f010000 ranges:

[    0.922347] OF: PCI:   No bus range found for /pcie@0x5f010000, using [bus 00-ff]

[    1.187991] imx6q-pcie 5f010000.pcie: phy link never came up

[    1.193315] imx6q-pcie 5f010000.pcie: Link never came up

[    1.198622] imx6q-pcie 5f010000.pcie: failed to initialize host

[    1.204522] imx6q-pcie 5f010000.pcie: unable to add pcie port.

[    1.210580] imx6q-pcie: probe of 5f010000.pcie failed with error -110

It seems that iMX8Q still uses the same driver for PCIe from iMX6. Does any body can address what's the root cause?

Thanks a lot,

[erik_young]

Hi I'm using the imx8mm and I'm getting similar messages. My goal is to get the Embedded Artist 1CX M.2 module up and running.

1. How do I begin to troubleshoot the issue?

2. Do we need an epdev_on regulator for pcie to work?

3. How does the ext_osc = <1> in the device tree relate to the message "pcie phy ppl can't be locked" dmesg

[    1.983047] imx6q-pcie 33800000.pcie: 33800000.pcie supply epdev_on not found, using dummy regulator
[    1.992612] OF: PCI: host bridge /pcie@0x33800000 ranges:
[    1.998031] OF: PCI:   No bus range found for /pcie@0x33800000, using [bus 00-ff]
[    2.005529] OF: PCI:    IO 0x1ff80000..0x1ff8ffff -> 0x00000000
[    2.011461] OF: PCI:   MEM 0x18000000..0x1fefffff -> 0x18000000
[    2.017844] imx6q-pcie 33800000.pcie: Initialize PHY with EXT REfCLK!.
[    2.024682] imx6q-pcie 33800000.pcie: PHY Initialization End!.
[    2.051619] imx6q-pcie 33800000.pcie: pcie phy pll can't be locked.
[    2.097900] imx6q-pcie 33800000.pcie: failed to initialize host
[    2.103825] imx6q-pcie 33800000.pcie: unable to add pcie port.

[igorpadykov · Accepted solution]

Hi Jim

it is necessary to attach some device to board pcie connector

to see link up linux messages.

May be useful to check i.MX8MDQLQ EVK Board Hardware User's Guide

https://www.nxp.com/docs/en/user-guide/IMX8MDQLQEVKHUG.pdf 

Best regards
igor
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[jimdai]

Hi Igor,

Thank you for the information. Just want to make sure it is expected and it is not a issue or bug before we doing further. 

Best regards,

Jim