[Bug 1903048] Re: [SRU] Bluetooth won't activate on the pi 400

[Łukasz Zemczak]

I personally think the revert is a bit extreme. Even though we are not
maintainers of bluez, this being a critical feature for the Pi400 we
would of course make sure that the changes get upstreamed as much as
possible and in the meantime maintain the patches ourselves as many
others related to the Pi (as in various other projects). Without this
fix the Pi400 is basically broken, so we wanted to unblock users as soon
as possible (for groovy) - the certification team is pushing hard on
this since a while. Was the revert discussed somewhere before being
performed?

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Title:
  [SRU] Bluetooth won't activate on the pi 400

Status in bluez package in Ubuntu:
  Triaged
Status in bluez source package in Hirsute:
  Triaged

Bug description:
  [Impact]

  Without these patches, Bluetooth is inoperable on the recently
  released Raspberry Pi 400.

  [Test Case]

  * Boot the Ubuntu Desktop for Pi image on a Pi 400.
  * Start the Settings application and switch to the Bluetooth tab
  * Verify that Bluetooth is not enabled and attempting to activate it fails
  * sudo add-apt-repository ppa:waveform/pi-bluetooth
  * sudo apt update
  * sudo apt install bluez
  * sudo reboot
  * Start the Settings application and switch to the Bluetooth tab
  * Verify that Bluetooth is active and that Bluetooth devices (e.g. mice, mobile phones, headphones, etc.) can connect and operate correctly 

  [Regression Potential]

  Extremely low (on groovy in particular, this has the same version of
  bluez as hirsute). The only significant risk is to non-Pi platforms or
  dongles which also use the Broadcom 43xx (or Cypress 305) chips for
  Bluetooth which might be inadvertently affected by these patches.

  [Original Description]

  The new Pi 400 has a slightly different Wifi/BT chip to the Pi4.
  Whilst wifi works happily, Bluetooth fails to operate. This doesn't
  appear to be an issue with either the firmware (the latest versions
  from upstream Raspbian have been tried), or the kernel (a known-good
  raspi kernel has been tested under Ubuntu), but with Bluez itself.
  Specifically, tracing the initialization with btmon on Raspbian and
  Ubuntu, the stack consistently fails when attempting to "Set Default
  PHY" on the latter. Curiously, under Ubuntu the adapter also appears
  to lack a MAC address.

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