[Bug 73081] Fail to setup Bluetooth on Dell Venue 11 Pro

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=73081

--- Comment #12 from Dmitry Khromov (icechrome@gmail.com) ---
@Hytham, noted.

First, please disregard everything I said about `CONFIG_SERIAL_DEV_BUG` -- got
another Baytrail device mixed up with this one, my bad. That said, the actual
problem, according to my notes, is the UART's `baud_base` (2764800), resulting
in framing errors with common baud rates (i.e. 3000000 and 3500000). The speed
the controller is pre-set to is 3768000. I've dug the tablet up and with
semi-recent musl-based Void rootfs and kernel 6.18.35 (CONFIG_SERIAL_DEV_BUS=m,
btw) got `btattach -B /dev/ttyS1 -P ath3k` working by manually setting the
speed with a `TCSETS2` ioctl. I’ve managed to pair and test some BT
peripherals.

@Paul, since, ultimately, this isn’t a kernel bug (though a patch for
rfkill-gpio is still required), should this discussion be continued on GitHub?

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