Re: [PATCH v3] rtl8xxxu: add bluetooth co-existence support for single antenna

From: Jes Sorensen
Date: Tue Oct 08 2019 - 12:00:53 EST

On 10/5/19 5:48 AM, Chris Chiu wrote:
The RTL8723BU suffers the wifi disconnection problem while bluetooth
device connected. While wifi is doing tx/rx, the bluetooth will scan
without results. This is due to the wifi and bluetooth share the same
single antenna for RF communication and they need to have a mechanism
to collaborate.

BT information is provided via the packet sent from co-processor to
host (C2H). It contains the status of BT but the rtl8723bu_handle_c2h
dose not really handle it. And there's no bluetooth coexistence
mechanism to deal with it.

This commit adds a workqueue to set the tdma configurations and
coefficient table per the parsed bluetooth link status and given
wifi connection state. The tdma/coef table comes from the vendor
driver code of the RTL8192EU and RTL8723BU. However, this commit is
only for single antenna scenario which RTL8192EU is default dual
antenna. The rtl8xxxu_parse_rxdesc24 which invokes the handle_c2h
is only for 8723b and 8192e so the mechanism is expected to work
on both chips with single antenna. Note RTL8192EU dual antenna is
not supported.

Signed-off-by: Chris Chiu <chiu@xxxxxxxxxxxx>

- Add helper functions to replace bunch of tdma settings
- Reformat some lines to meet kernel coding style
- Add comment for rtl8723bu_set_coex_with_type()

Looks good to me!

Signed-off-by: Jes Sorensen <Jes.Sorensen@xxxxxxxxx>