12:10 <tdebrouw> narmstrong: I have a strange issue.

12:10 <tdebrouw> On a a311d device

12:10 <tdebrouw> Image is fine over mipi

12:10 <tdebrouw> but

12:11 <tdebrouw> I added an nvme drive on the pcie bus

12:11 <tdebrouw> the drive is fine

12:12 <tdebrouw> if I copy a file to the disk, then the mipi output is messed up

12:13 <tdebrouw> I mounted my drive on /nvme

12:13 <tdebrouw> dd if=/dev/zero of=/nvme/test.test bs=4M

12:14 <tdebrouw> is giving me a garbled output

12:28 <tdebrouw> *output on mipi

12:29 <tdebrouw> I'm thinking about signal integrity

12:30 <tdebrouw> or priorities on the internal axi bus?

12:30 <tdebrouw> any other suggestions?

12:30 <tdebrouw> any way to configure the priorities?

12:40 <narmstrong> tdebrouw: add `pci=pcie_bus_perf` to the kernel cmdline

14:32 <tdebrouw> narmstrong: that fixed my issue

14:32 <tdebrouw> thanks a lot

14:32 <tdebrouw> although I'm not sure why it's fixed?

14:51 <narmstrong> tdebrouw: it's the right fix, khadas tried to have it in the kernel, but it's not that simple

14:52 <narmstrong> tdebrouw: TL;DR witthout this the PCIe inbound packets are too long for how the PCIe controller was configured and they get split and then it saturates the AXI DDR interface causing read delays on the display controller

15:08 <tdebrouw> narmstrong: that makes sense

15:08 <tdebrouw> thanks