Invalid compatible on CM4 arm64

[Juerg Haefliger]

[Impact]

The CM4 device tree returns an incorrect compatible for arm64.

arm64:

$ cat /proc/device-tree/model
Raspberry Pi Compute Module 4 Rev 1.0
$ cat /proc/device-tree/compatible
raspberrypi,4-model-b
brcm,bcm2711

armhf:

$ cat /proc/device-tree/model
Raspberry Pi Compute Module 4 Rev 1.0
$ cat /proc/device-tree/compatible
raspberrypi,4-compute-module
brcm,bcm2711

[Test Case]

See above.

[Where Problems Could Occur]

The brcmfmac driver uses that string to decide which wifi firmware to load. That will fail, if the correct firmware is not installed which means wifi will not work. There could be other drivers, that make use of this string.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-groovy' to 'verification-done-groovy'. If the problem still exists, change the tag 'verification-needed-groovy' to 'verification-failed-groovy'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-raspi - 5.8.0-1020.23

---------------
linux-raspi (5.8.0-1020.23) groovy; urgency=medium

  * groovy/linux-raspi: 5.8.0-1020.23 -proposed tracker (LP: #1921049)

  * Enforce CONFIG_DRM_BOCHS=m (LP: #1916290)
    - [Config] raspi: Keep CONFIG_DRM_BOCHS disabled

  * Invalid compatible on CM4 arm64 (LP: #1919349)
    - dts: Add CM4 to arm64 dt files
    - dts: Tidy the Raspberry Pi Makefile entries

  [ Ubuntu: 5.8.0-49.55 ]

  * groovy/linux: 5.8.0-49.55 -proposed tracker (LP: #1921053)
  * selftests: bpf verifier fails after sanitize_ptr_alu fixes (LP: #1920995)
    - bpf: Simplify alu_limit masking for pointer arithmetic
    - bpf: Add sanity check for upper ptr_limit
    - bpf, selftests: Fix up some test_verifier cases for unprivileged
  * Packaging resync (LP: #1786013)
    - update dkms package versions
  * improper memcg accounting causes NULL pointer derefs (LP: #1918668)
    - SAUCE: Revert "mm: memcg/slab: optimize objcg stock draining"
  * kernel: Enable CONFIG_BPF_LSM on Ubuntu (LP: #1905975)
    - [Config] Enable CONFIG_BPF_LSM
  * Groovy update: upstream stable patchset 2021-03-10 (LP: #1918516)
    - gpio: mvebu: fix pwm .get_state period calculation
    - HID: wacom: Correct NULL dereference on AES pen proximity
    - media: v4l2-subdev.h: BIT() is not available in userspace
    - RDMA/vmw_pvrdma: Fix network_hdr_type reported in WC
    - kernel/io_uring: cancel io_uring before task works
    - io_uring: dont kill fasync under completion_lock
    - objtool: Don't fail on missing symbol table
    - mm/page_alloc: add a missing mm_page_alloc_zone_locked() tracepoint
    - mm: fix a race on nr_swap_pages
    - tools: Factor HOSTCC, HOSTLD, HOSTAR definitions
    - iwlwifi: provide gso_type to GSO packets
    - tty: avoid using vfs_iocb_iter_write() for redirected console writes
    - ACPI: sysfs: Prefer "compatible" modalias
    - kernel: kexec: remove the lock operation of system_transition_mutex
    - ALSA: hda/realtek: Enable headset of ASUS B1400CEPE with ALC256
    - ALSA: hda/via: Apply the workaround generically for Clevo machines
    - parisc: Enable -mlong-calls gcc option by default when !CONFIG_MODULES
    - media: cec: add stm32 driver
    - media: hantro: Fix reset_raw_fmt initialization
    - media: rc: fix timeout handling after switch to microsecond durations
    - media: rc: ite-cir: fix min_timeout calculation
    - media: rc: ensure that uevent can be read directly after rc device register
    - ARM: dts: tbs2910: rename MMC node aliases
    - ARM: dts: ux500: Reserve memory carveouts
    - ARM: dts: imx6qdl-gw52xx: fix duplicate regulator naming
    - wext: fix NULL-ptr-dereference with cfg80211's lack of commit()
    - ASoC: AMD Renoir - refine DMI entries for some Lenovo products
    - drm/i915: Always flush the active worker before returning from the wait
    - drm/i915/gt: Always try to reserve GGTT address 0x0
    - drivers/nouveau/kms/nv50-: Reject format modifiers for cursor planes
    - net: usb: qmi_wwan: added support for Thales Cinterion PLSx3 modem family
    - s390: uv: Fix sysfs max number of VCPUs reporting
    - s390/vfio-ap: No need to disable IRQ after ...