Hi Hui,
> This issue starts from linux-5.10-rc1, I reproduced this issue on my
> Dell Inspiron 7447 with BT adapter 0cf3:e005, the kernel will print
> out: "Bluetooth: hci0: don't support firmware rome 0x31010000", and
> someone else also reported the similar issue to bugzilla #211571.
>
> I found this is a regression introduced by 'commit b40f58b97386
> ("Bluetooth: btusb: Add Qualcomm Bluetooth SoC WCN6855 support"), the
> patch assumed that if high ROM version is not zero, it is an adapter
> on WCN6855, but many old adapters don't need to load rampatch or nvm,
> and they have non-zero high ROM version.
>
> To fix it, let the driver match the rom_version in the
> qca_devices_table first, if there is no entry matched, check the
> high ROM version, if it is not zero, we assume this adapter is ready
> to work and no need to load rampatch and nvm like previously.
>
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=211571
> Fixes: b40f58b97386 ("Bluetooth: btusb: Add Qualcomm Bluetooth SoC WCN6855 support")
> Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx>
> ---
> drivers/bluetooth/btusb.c | 7 +++++++
> 1 file changed, 7 insertions(+)
patch has been applied to bluetooth-next tree.
Regards
Marcel
