Bug#915808: Current dtb for raspberry pi 3b doesn't allow wifi to be used

[Santiago Garcia Mantinan <manty@debian.org>]

Package: src:linux
Version: 4.18.20-2
Severity: normal
Tags: patch

Hi!

After kernel 4.17 the dtb for raspberry pi 3 b is not ok and thus the wifi
is not found and cannot be used.

Looking at the differences from 4.17 to 4.18 I have discovered that if you
revert this single patch affecting only the pi3b model the wifi is
discovered and works again.

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm/boot/dts/bcm2837-rpi-3-b.dts?id=b1b8f45b3130dbd8704e5ea0d82b49b1d929498e

I have tested this both on Linus kernel 4.20-rc5 and on Debian 4.19.5 as
currently on experimental, on both reverting this patch makes the wifi work
again.

Regards

-- Package-specific info:
** Kernel log: boot messages should be attached

** Model information
Device Tree model: Raspberry Pi 3 Model B Rev 1.2

** PCI devices:
not available

** USB devices:
Bus 001 Device 006: ID 0bc2:2322 Seagate RSS LLC 
Bus 001 Device 005: ID 0b95:772b ASIX Electronics Corp. AX88772B
Bus 001 Device 004: ID 0939:0b15 Lumberg, Inc. Toshiba Stor.E Alu 2
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable'), (1, 'experimental')
Architecture: arm64 (aarch64)

Kernel: Linux 4.19.5 (SMP w/4 CPU cores)
Locale: LANG=gl_ES.UTF-8, LC_CTYPE=gl_ES.UTF-8 (charmap=UTF-8), LANGUAGE=gl_ES.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-4.18.0-3-arm64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.132
ii  kmod                                    25-2
ii  linux-base                              4.5

Versions of packages linux-image-4.18.0-3-arm64 recommends:
ii  apparmor             2.13.1-3+b1
ii  firmware-linux-free  3.4
ii  irqbalance           1.5.0-0.1

Versions of packages linux-image-4.18.0-3-arm64 suggests:
pn  debian-kernel-handbook  <none>
pn  linux-doc-4.18          <none>

Versions of packages linux-image-4.18.0-3-arm64 is related to:
pn  firmware-amd-graphics     <none>
pn  firmware-atheros          <none>
pn  firmware-bnx2             <none>
pn  firmware-bnx2x            <none>
ii  firmware-brcm80211        20180825+dfsg-1
pn  firmware-cavium           <none>
pn  firmware-intel-sound      <none>
pn  firmware-intelwimax       <none>
pn  firmware-ipw2x00          <none>
pn  firmware-ivtv             <none>
pn  firmware-iwlwifi          <none>
pn  firmware-libertas         <none>
pn  firmware-linux-nonfree    <none>
pn  firmware-misc-nonfree     <none>
pn  firmware-myricom          <none>
pn  firmware-netxen           <none>
pn  firmware-qlogic           <none>
ii  firmware-realtek          20180825+dfsg-1
pn  firmware-samsung          <none>
pn  firmware-siano            <none>
pn  firmware-ti-connectivity  <none>
pn  xen-hypervisor            <none>

-- no debconf information