OV2740 camera/webcam sensor on X1 Nano Gen2

Hi all. Thank you for supporting this hardware on an open source OS. It's beyond appreciated. I've attempted to build your software/DKMS drivers on Arch linux for the Alder Lake IPU6 with the OV2740 sensor. Using the most recently available git packages, I'm unable to load the intel-ipu6-psys and intel-ipu6-isys modules. modprobe for intel-ipu6 itself loads the module and after this I'm able to load the ov2740 module but not with the psys/isys modules.

```
❯ sudo dmesg | grep -i -e 'ipu|mei|ov2|vsc|v4l' | egrep -v audit Tue 18 Oct 2022 12:36:55 PM MDT
egrep: warning: egrep is obsolescent; using grep -E
[ 0.011252] ACPI: SSDT 0x000000008D828000 000150 (v02 LENOVO IpuSsdt 00001000 INTL 20200717)
[ 10.671738] v4l2loopback driver version 0.12.7 loaded
[ 11.812411] mei_me 0000:00:16.0: enabling device (0000 -> 0002)
[ 13.856510] mei_hdcp 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04: bound 0000:00:02.0 (ops i915_hdcp_component_ops [i915])
[ 13.864941] mei_pxp 0000:00:16.0-fbf6fcf1-96cf-4e2e-a6a6-1bab8cbe36b1: bound 0000:00:02.0 (ops i915_pxp_tee_component_ops [i915])
[ 4543.903121] intel-ipu6 intel-ipu: enabling device (0000 -> 0002)
[ 4543.903288] intel-ipu6 intel-ipu: Device 0x465d (rev: 0x2)
[ 4543.903317] intel-ipu6 intel-ipu: physical base address 0x603c000000
[ 4543.903318] intel-ipu6 intel-ipu: mapped as: 0x00000000abd82859
[ 4543.903365] intel-ipu6 intel-ipu: IPU in secure mode
[ 4543.903366] intel-ipu6 intel-ipu: IPU secure touch = 0x0
[ 4543.903367] intel-ipu6 intel-ipu: IPU camera mask = 0xff
[ 4543.921040] intel-ipu6 intel-ipu: IPC reset done
[ 4543.921042] intel-ipu6 intel-ipu: cpd file name: intel/ipu6ep_fw.bin
[ 4543.922677] intel-ipu6 intel-ipu: FW version: 20220510
[ 4543.922896] RIP: 0010:ipu_pci_probe.cold+0x3fc/0x930 [intel_ipu6]
[ 4543.923008] ipu_init+0x3f/0x1000 [intel_ipu6 cb9a573451b991ba9515d26d3199af1054f2a906]
[ 4543.923070] Modules linked in: intel_ipu6(OE+) videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common uhid rfcomm cmac algif_hash algif_skcipher af_alg bnep snd_seq_dummy snd_hrtimer snd_seq snd_seq_device bridge stp llc wireguard curve25519_x86_64 libchacha20poly1305 chacha_x86_64 poly1305_x86_64 libcurve25519_generic libchacha ip6_udp_tunnel udp_tunnel uinput snd_ctl_led snd_soc_skl_hda_dsp snd_soc_intel_hda_dsp_common spi_ljca(OE) i2c_ljca(OE) snd_soc_hdac_hdmi snd_sof_probes gpio_ljca(OE) spi_nor snd_soc_dmic joydev mousedev mtd iTCO_wdt intel_pmc_bxt iTCO_vendor_support mei_pxp mei_hdcp mei_wdt pmt_telemetry pmt_class intel_rapl_msr intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel polyval_clmulni polyval_generic gf128mul ghash_clmulni_intel aesni_intel crypto_simd cryptd rapl intel_cstate intel_uncore psmouse pcspkr think_lmi firmware_attributes_class wmi_bmof btusb btrtl btbcm btintel
[ 4543.923140] btmtk bluetooth ecdh_generic crc16 ljca(OE) snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_sof_pci_intel_tgl snd_sof_intel_hda_common soundwire_intel soundwire_generic_allocation soundwire_cadence snd_sof_intel_hda iwlmvm snd_sof_pci snd_sof_xtensa_dsp snd_sof snd_sof_utils snd_soc_hdac_hda mac80211 snd_hda_ext_core snd_soc_acpi_intel_match snd_soc_acpi soundwire_bus snd_soc_core snd_compress ac97_bus snd_pcm_dmaengine libarc4 snd_hda_intel snd_intel_dspcfg snd_intel_sdw_acpi snd_hda_codec iwlwifi snd_hda_core snd_hwdep snd_pcm cfg80211 spi_intel_pci i2c_i801 spi_intel intel_lpss_pci i2c_smbus snd_timer intel_lpss mei_me idma64 processor_thermal_device_pci processor_thermal_device thunderbolt processor_thermal_rfim ucsi_acpi processor_thermal_mbox typec_ucsi processor_thermal_rapl intel_vsec thinkpad_acpi intel_rapl_common typec igen6_edac roles ledtrig_audio platform_profile rfkill snd mei_vsc(OE) mei soundcore int3403_thermal soc_button_array
[ 4543.923188] int340x_thermal_zone mac_hid ov2740(OE) v4l2_fwnode tpm_crb v4l2_async intel_skl_int3472_tps68470 tps68470_regulator tpm_tis tpm_tis_core clk_tps68470 tpm intel_skl_int3472_discrete intel_hid rng_core sparse_keymap int3400_thermal acpi_thermal_rel acpi_tad acpi_pad vboxnetflt(OE) vboxnetadp(OE) vboxdrv(OE) v4l2loopback(OE) videodev mc dm_multipath dm_mod sg crypto_user fuse acpi_call(OE) bpf_preload ip_tables x_tables serio_raw atkbd xhci_pci xhci_pci_renesas libps2 wmi vivaldi_fmap i8042 serio zram i915 drm_buddy video drm_display_helper cec ttm intel_agp intel_gtt zfs(POE) zunicode(POE) zzstd(OE) zlua(OE) zavl(POE) icp(POE) zcommon(POE) znvpair(POE) spl(OE) nvme nvme_core nvme_common
[ 4543.923464] RIP: 0010:ipu_pci_probe.cold+0x3fc/0x930 [intel_ipu6]
[ 5370.637306] v4l2loopback driver version 0.12.7 loaded
```

I'm uncertain what other feedback to provide as with the module hang I've been unable to get further debug information. I would be very happy to provide any feedback you need to troubleshoot.

Also, are you able to comment on the "intel_iommu=off" kernel option? Is this necessary?

Take care.