[Letux-kernel] Letux 4.12-rc3 coming

Belisko Marek marek.belisko at gmail.com
Mon May 29 12:50:13 CEST 2017

Hi Nikolaus,

On Mon, May 29, 2017 at 11:13 AM, H. Nikolaus Schaller
<hns at goldelico.com> wrote:
> I am just upgrading to 4.12-rc3. There have again been changes to serdev (and its integration into tty).
> Bluetooth did kernel panic on GTA04A5 but worked on Pyra with just a lock dependency warning (both are using the same WL1837MOD).
> Otherwise things seem to work better. The double-probe() problem of serdev+tty drivers has disappeared.
> Next I am thinking about the Bluetooth support. I didn't know so far that there is sort of kernel-built-in-hciattach.
> I.e. we just have to register the w2cbw as a hci device and there is no need for a user-space daemon any more.
It's some new feature added to recent kernels? maybe this one:
drivers/bluetooth/hci_serdev.c. I would be interested to look further
as I had in past problems with BT on my gta04. Thanks.
> Looks good - except one thing. We might need to be able to access the serial interface for baudrate probing.
> Well, we don't... Because all GTA04 boards with working w2cbw have already been reconfigured to 3Mbit/s.
> And it is very unlikely that one of the broken boards get repaired.
> In that rare case it is still possible to boot without the serdev driver module (we will then have a /dev/ttyO0)
> and turn on WLAN to power on the BT side.
> Or I add a CONFIG option so that the w2cbw driver can either expose a /dev/ttyBT0 or a hci0 interface.
> BR,
> Nikolaus
> _______________________________________________
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