Re: [4.15 stable regression] "Bluetooth: btusb: Fix quirk for Atheros 1525/QCA6174" breaks bluetooth on some devices

[Hans de Goede <hdegoede@redhat.com>]

Hi,

On 18-04-18 15:18, Hans de Goede wrote:
> Hi Takashi, Marcel,
> 
> It seems that this commit:
> https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?h=linux-4.15.y&id=7ec32f585fefd7c154453aa29ccf8fa2a11cc865
> 
> Is breaking bluetooth on some devices, see:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=1568911
> 
> The problem is the following error now being thrown:
> 
> [   28.466248] Bluetooth: hci0: don't support firmware rome 0x1020200
> 
> Looking at the code I wonder if maybe we need to mask the ver_rom
> with & 0xfff when comparing it to the qca_devices_table[i].rom_version
> filed ?
> 
> Or maybe the commit is actually wrong, or maybe devices with the
> 0cf3:3004 USB id need either the BTUSB_QCA_ROM or BTUSB_ATH3012
> quirk depending on the device and we need to probe this somehow?

I've been receiving more complaints from users about this on
various devices, so I think that the 7ec32f585fefd7c154453aa29ccf8fa2a11cc865
commit should be reverted from 4.15.x while we figure this out.

Does anyone have any idea how we cam distinguish between the 2
different versions which seem to be hiding between the same USB-id ?

Regards,

Hans