[PCIE] PCIE SMMU error and kernel panic

Hi great experts,

We are porting our QCA WCN6856 drivers on L4T R32.7.1 (Kernel 4.9), and found the kernel panic with SMMU error messages as below. But this driver is work on L4T R35.1 (Kernel 5.10) without error. Is any patche we can apply on R32.7.1? We already tried to disable the SMMU in the kernel dts file, but it doesn’t work.
Xavier_NX_R32.7.1_SMMU_error_log.txt (34.0 KB)

[  535.579921] t19x-arm-smmu 12000000.iommu: Unhandled context fault: smmu0, iova=0xff66c000, fsynr=0x10002, cb=0, sid=90(0x5a - PCIE4), pgd=260c50003, pud=260c50003, pmd=0, pte=0

[  535.580295] t19x-arm-smmu 12000000.iommu: Unhandled context fault: smmu1, iova=0xff66c000, fsynr=0x80012, cb=0, sid=90(0x5a - PCIE4), pgd=260c50003, pud=260c50003, pmd=0, pte=0

PS:

The WCN6856 driver is from:
https://source.codeaurora.org/external/wlan/qcacld-3.0/
https://source.codeaurora.org/external/wlan/wlan-cnss-core
http://source.codeaurora.org/external/wlan/fw-api
https://source.codeaurora.org/external/wlan/qca-wifi-host-cmn

Thanks,

Kunyang