netdev - Re: [PATCH 6/7] net: wireless: wcn36xx: remove powersaving for wcn3620

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Date:	Mon, 9 Feb 2015 13:40:30 -0800
From:	Bjorn Andersson <bjorn@...o.se>
To:	Andy Green <andy.green@...aro.org>
Cc:	netdev <netdev@...r.kernel.org>,
	Eugene Krasnikov <k.eugene.e@...il.com>,
	Kalle Valo <kvalo@...eaurora.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	wcn36xx <wcn36xx@...ts.infradead.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH 6/7] net: wireless: wcn36xx: remove powersaving for wcn3620

On Mon, Feb 9, 2015 at 1:28 PM, Andy Green <andy.green@...aro.org> wrote:
> On 10 February 2015 at 05:11, Bjorn Andersson <bjorn@...o.se> wrote:
>> On Feb 9, 2015 1:07 PM, "Andy Green" <andy.green@...aro.org> wrote:
>>>
>>> On 10 February 2015 at 01:54, Bjorn Andersson <bjorn@...o.se> wrote:
>>> > On Sat, Jan 17, 2015 at 9:11 PM, Andy Green <andy.green@...aro.org>
[..]
>>> At that point I think a nice solution would be a donation of time from
>>> guys who specialize in wcn for a living to come and hand out a pony or
>>> two...
>>>
>>
>> I agree, my goal is that we get this running in mainline (smd, smsm, smp2p
>> and remoteproc-tz) so that people with the domain knowledge can go in and
>> make it work well.
>
[..]
>
> Can I ask if smdtty will also appear?  I uplevelled and hacked smdtty
> a bit from a 3.10 reference tree for 8916-qrd, and I was able to get
> wcn3620 BT working stably for BT keyboard + mouse and even ad2p.
>
> However the hack bound together smdtty ch2 + 3 in smdtty driver and
> made it understand about the missing hci protocol byte... this is far
> from reasonable for upstream, but it works like the 3.10 except needs
> no special bluez / userland treatment.  So I'm curious if no smdtty
> how the split smd hci / acl link in firmware will appear coherently to
> userspace as a normal uart.
>

I'm not entirely sure how we're to proceed with this one.

In msm-3.4 with BlueZ the kernel has a driver named hci_smd, that
consumes the two channels and register with the hci core.

In msm-3.10 Qualcomm have dropped this, because they are running
bluedroid which instead consumes the two smd channels in userspace
(through the smd_pkt driver).

We need smd_pkt for modem related matters anyways, so on that we can
run bluedroid and we could bring in hci_smd for use with BlueZ. But
then we would have to configure the kernel based on what stack we want
to run on top.

So we should probably look into userspace and try to consolidate
things there before deciding where to take this.

Regards,
Bjorn
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