Public bug reported:
This OOT patch is needed for the VR platform to avoid these warnings:
[ 14.860697] Tegra APB MISC not yet available
[ 14.860741] WARNING: CPU: 5 PID: 1 at
drivers/soc/tegra/fuse/tegra-apbmisc.c:37 tegra_get_chip_id+0x58/0x88
[ 14.863038] Modules linked in:
[ 14.988004] Freeing initrd memory: 78908K
[ 25.193803] CPU: 5 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.2+ #2
PREEMPT(none)
[ 25.201529] Hardware name: NVIDIA VR200 NVL72/P3809-BMC, BIOS 00.01.00.08
2026-01-03T21:17:31+00:00
[ 25.210378] pstate: 61000009 (nZCv daif -PAN -UAO -TCO +DIT -SSBS BTYPE=--)
[ 25.217252] pc : tegra_get_chip_id+0x58/0x88
[ 25.221720] lr : tegra_get_chip_id+0x58/0x88
[ 25.225931] sp : ffff800080b3ba90
[ 25.229110] x29: ffff800080b3ba90 x28: ffff080019014780 x27: ffffb72a42e72520
[ 25.236156] x26: ffffb72a42fcb000 x25: 000000000000010b x24: 0000000000000000
[ 25.243202] x23: ffffb72a44caf000 x22: ffff08002638f800 x21: ffff08002638f810
[ 25.250248] x20: ffffb72a44caf1e8 x19: ffffb72a44caf310 x18: ffff800080b1b080
[ 25.257294] x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000
[ 25.264340] x14: ffffffffffffffff x13: 0a656c62616c6961 x12: 7661207465792074
[ 25.271385] x11: 6f6e204353494d20 x10: 4250412061726765 x9 : 0000000000000000
[ 25.278431] x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
[ 25.285477] x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000
[ 25.292523] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000000
[ 25.299570] Call trace:
[ 25.301805] tegra_get_chip_id+0x58/0x88 (P)
[ 25.306272] tegra_fuse_probe+0x26c/0x430
[ 25.310138] platform_probe+0x74/0x100
[ 25.313747] really_probe+0xd8/0x3e8
[ 25.317442] __driver_probe_device+0x94/0x1c8
[ 25.321653] driver_probe_device+0x48/0x188
[ 25.325605] __driver_attach+0x14c/0x2c8
[ 25.329729] bus_for_each_dev+0x88/0x110
[ 25.333596] driver_attach+0x30/0x60
[ 25.337119] bus_add_driver+0x17c/0x2e8
[ 25.340642] driver_register+0x68/0x178
[ 25.344422] __platform_driver_register+0x30/0x60
[ 25.349234] tegra_fuse_driver_init+0x28/0x50
[ 25.353531] do_one_initcall+0x64/0x378
[ 25.357140] kernel_init_freeable+0x23c/0x500
[ 25.361608] kernel_init+0x3c/0x258
[ 25.364873] ret_from_fork+0x10/0x20
[ 25.368654] ---[ end trace 0000000000000000 ]---
[ 25.373229] tegra-fuse NVDA200F:00: error -EINVAL: Unsupported SoC: 00
[ 25.373248] tegra-fuse NVDA200F:00: probe with driver tegra-fuse failed with
error -22
[ 25.373801] ------------[ cut here ]------------
This patch will be posted to LKML in the near future.
After building the kernel with this patch, I verified that the warnings
are no longer present on a VR system.
** Affects: linux-nvidia (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2138329
Title:
[linux-nvidia-6.17] Backport NVIDIA: VR: SAUCE: soc/tegra: misc: Use
SMCCC to get chipid
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