[Bug 211013] Cannot find ath3k bluetooth controller attached on USB

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=211013

--- Comment #1 from Tianhao Chai (cth451@gmail.com) ---
Apparently this ver_rom 0x11020000 has never been recorded in
qca_devices_table[] defined in btusb.c.

Before 5.10 (i.e. 5.9.x and possibly earlier), the function btusb_setup_qca()
will short circuit and return 0 before querying the device table (the following
from 5.9.16, btusb.c:3627):

        ver_rom = le32_to_cpu(ver.rom_version);
        /* Don't care about high ROM versions */
        if (ver_rom & ~0xffffU)
                return 0;

Since this check is removed in 5.10.x due to added support of WCN6855 (which
has a high ROM version), the driver would return -ENODEV as this 0x11020000
doesn't exist in qca_devices_table in the first place.

I am not sure how this should be resolved. We could check whether ver_rom ==
0x11020000 and directly return 0 (and the card would work after that), but I
think this is a very dirty approach.

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