PCIE mode on VIM4 fails with new quectel firmware

VIM4
1

Which system do you use? Android, Ubuntu, OOWOW or others?

Ubuntu

Which version of system do you use? Please provide the version of the system here:

5.15.119 #1.6.9.1 SMP PREEMPT Thu Jun 20 09:22:43 CST 2024

(server)

Please describe your issue below:

Quectel RM520 with R03 firmware does not work in PCIE mode.
Dmesg shows the message below and the /dev/mhi_DUN etc devices are not created.

The same config works on older Quectel R01 firmware.
Quectel say the R03 works in PCIE mode on other boards.
Is there anything I can do to change the driver config to work around this error ?

Thanks.

@numbqq (perhaps?)

Post a console log of your issue below:


[   43.907416] mhi_init Quectel_Linux_PCIE_MHI_Driver_V1.3.7
[   43.908037] Failed to set up IOMMU for device 0000:01:00.0; retaining platform DMA ops
[   43.908078] mhi_pci_probe pci_dev->name = 0000:01:00.0, domain=0, bus=1, slot=0, vendor=17CB, device=0308
2

Any ideas here ?
It looks like the driver partially loads then fails to map the MMU.
Is there a timing problem here (power up sequence?).

If I blacklist the driver, then manually insmod it I can sometimes get it to load correctly.

I’d stick with the old firmware except that it doesn’t support e-sims correctly and the new firmware does.

Clues? Help? Please…

@numbqq

3

@numbqq Hi, I have sent logs to the Quectel R+D team and they say that the Khadas PCIE behaviour is wrong

  1. I have checked the logsFromModule.txt file，the log shows PCIe link training failed;
  2. The link training fail reason is the host set PCIe PERST pin to low when the host and module execute PCIe link training, below is the log:
  3. Please check host PCIe PERST pin timing, why host PCIe set PERST pin to high and then set to low;

I can send you the associated logs etc by DM if you need them.

Is there a way to change this behaviour on the PCIE driver in the 5.15 kernel ?

Thanks.
Tim.

4

Hello @steely-glint

Could you check with latest image 1.7.1-240930? You can install with oowow online.

5

Hi @numbqq I hope you had a good {short} holiday!.

I installed the 1.7.1-240930 image - exactly the same results - only /dev/mhi_BHI is present none of the other mhi_* devices. Also the same message in dmesg.

I can give you ssh access to a VIM4 with the RM520 if that helps - or I can DM you the detailed comments from Quectel.

Or let me know how I can help debug this.

Thanks.

Tim.

6

Not sure about this, but it works for our 5G NR module add-on RM500Q, we can’t reproduce this issue as we don’t have same module you used.

7

@numbqq Have you upgraded to the latest firmware on the RM500 ? It used to work on the older firmware on the RM520 then stopped working when I upgraded to get the e-sim functionality.

I will DM you the notes from Quectel.

8

Hello @steely-glint

We will check on our side. How you upgrade the firmeware?

10

@numbqq I bought a new one direct from Quectel!

(backstory:
On an older module with a damaged antenna connector I ran
QFirehose -f /mnt/sdb1/firmware
to do the upgrade with the correct firmware from Quectel.
I assumed I’d bricked it because the interfaces didn’t come up, and bought a new one.
Turns out that the upgrade was fine but it doesn’t get on with your pcie kernel driver…)

11

Hello @steely-glint

We have reproduced this issue with RM500 to upgrade the firmware, we will check this issue on our side.

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