topic Re: imx6 - Linux 4.1.15 - PCIe switch problem in i.MX Processors

imx6 - Linux 4.1.15 - PCIe switch problem

aebischerquenti — Thu, 07 Dec 2017 15:40:56 GMT

Hi everyone,

We are trying to evaluate a PCIe switch 1 to 4 ports solution (based on chipset ASM1184e from ASMedia) for our next board design.

To test the switch, we are using a Phytec pbab01 board (designed with an imx6q), and the NXP linux kernel 4.1.15.

When plugging in an i210 intel PCIe ethernet card, the card is detected no problem.

When plugging in the PCIe switch, PCIe initialization fails with following logs :

imx6q-pcie 1ffc000.pcie: phy link never came up
imx6q-pcie 1ffc000.pcie: failed to initialize host
imx6q-pcie: probe of 1ffc000.pcie failed with error -22

We already added some additional delays like it was recommended in several threads dealing with PCIe initialization issue.

We tried adding RC imx6 PCIe, but it didn't do anything more.

Any hints/help is appreciated !

Thanks and regards,

Quentin

Re: imx6 - Linux 4.1.15 - PCIe switch problem

igorpadykov — Thu, 07 Dec 2017 23:30:29 GMT

Hi Quentin

for toradex boards may be useful to look at reset polarity patches

i.MX6 PCIe: Fix imx6_pcie_deassert_core_reset() polarity - Patchwork

Best regards
igor
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Re: imx6 - Linux 4.1.15 - PCIe switch problem

aebischerquenti — Fri, 08 Dec 2017 09:19:29 GMT

Igor,

Thank you for your answer. I tried the patch that you linked, but it still doesn't work. Also I tried with a mainline kernel, the link still doesn't goes up but the enumeration goes a bit further :

1.368232] imx6q-pcie 1ffc000.pcie: phy link never came up
[ 1.371756] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00
[ 1.371787] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 1.371811] pci_bus 0000:00: root bus resource [io 0x0000-0xffff]
[ 1.371834] pci_bus 0000:00: root bus resource [mem 0x01000000-0x01efffff]
[ 1.372945] PCI: bus0: Fast back to back transfers disabled
[ 1.373197] PCI: bus1: Fast back to back transfers enabled
[ 1.373270] pci 0000:00:00.0: BAR 0: assigned [mem 0x01000000-0x010fffff]
[ 1.373304] pci 0000:00:00.0: BAR 6: assigned [mem 0x01100000-0x0110ffff pref]
[ 1.373329] pci 0000:00:00.0: PCI bridge to [bus 01]

Is there a mailing list where I could find help ?

Thanks

Quentin

Re: imx6 - Linux 4.1.15 - PCIe switch problem

igorpadykov — Fri, 08 Dec 2017 11:51:38 GMT

Hi Quentin

this may be posted on meta-fsl-arm mailing list
meta-freescale Info Page

Best regards
igor

Re: imx6 - Linux 4.1.15 - PCIe switch problem

启帆杨 — Thu, 07 Mar 2019 03:23:37 GMT

Do you solve the problem？

if you have solve it,can you give me some measure.

thank.