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SubjectRe: [PATCH v2] rtl8xxxu: add bluetooth co-existence support for single antenna
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 <>

As Jes was positive about this in v1 and had only cosmetic comments, I'm
planning to apply this. If there are any changes needed, those can be fixed in
a followup patch.


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