[Bug 60824] [PATCH][regression] Cambridge Silicon Radio, Ltd Bluetooth Dongle unusable

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https://bugzilla.kernel.org/show_bug.cgi?id=60824

--- Comment #85 from Sergey Kondakov (virtuousfox@gmail.com) ---
Created attachment 289871
  --> https://bugzilla.kernel.org/attachment.cgi?id=289871&action=edit
CSR_ds4_fail.btsnoop

(In reply to Swyter from comment #80)
> Hi, Andrés. Thanks for testing v1! I just submitted a revised v2 after
> following the recommendations of Marcel Holtmann and finding a better way of
> classifying them by type:
> 
> https://patchwork.kernel.org/patch/11622161/
> 
> 
> In your case, and as it says after iProduct in your lsusb -v dump, yours
> should be a legit Cambridge Silicon Radio CSR8510 A10 chip and detected as
> such.
> 
> Those have the HCI_QUIRK_BROKEN_STORED_LINK_KEY bug.
> 
> Same as my dongle. Give v2 a go. :)

Tried it for my DS4. Unfortunately the result is the same as when I tried to
hardcode my ID: gamepad thinks that it's paired but system does not register
it. I've fiddled about with `btmon` and it seems that everything goes wrong at:
HCI Event: Role Change (0x12) plen 8
        Status: Role Switch Failed (0x35)
        Role: Slave (0x01)

You may read full dump with `btmon -r <file>`

`dmesg --color=always | grep -i CSR` says:
[   11.516062] Bluetooth: hci0: CSR: New controller detected; bcdDevice=0x8891,
HCI manufacturer=10, HCI rev=0x811, LMP subver=0x811
[   11.516065] Bluetooth: hci0: CSR: Modern CSR controller type detected

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