[PATCH v8 2/3] CMDQ: Mediatek CMDQ driver

[Horng-Shyang Liao]

On Fri, 2016-06-03 at 18:41 +0530, Jassi Brar wrote:
> On Fri, Jun 3, 2016 at 4:48 PM, Matthias Brugger <matthias.bgg at gmail.com> wrote:
> > On 03/06/16 08:12, Horng-Shyang Liao wrote:
> >> On Thu, 2016-06-02 at 10:46 +0200, Matthias Brugger wrote:
> 
> >>> I keep thinking about how to get rid of the two data structures,
> >>> task_busy_list and the task_release_wq. We need the latter for the only
> >>> sake of getting a timeout.
> >>>
> >>> Did you have a look on how the mailbox framework handles this?
> >>> By the way, what is the reason to not implement the whole driver as a
> >>> mailbox controller? For me, this driver looks like a good fit.
> >>
> >>
> >> CMDQ needs to encode commands for GCE hardware. We think this behavior
> >> should be put in CMDQ driver, and client just call CMDQ functions.
> >> Therefore, if we want to use mailbox framework, cmdq_rec must be
> >> mailbox client, and the others must be mailbox controller.
> >>
> >
> > You mean the functions to fill the cmdq_rec and execute it?
> > I think this should be part of the driver.
> >
> > Jassi, can you have a look on the interface this driver exports [0].
> > They are needed to actually create the message which will be send.
> > Could something like this be part of a mailbox driver?
> >
> > [0] https://patchwork.kernel.org/patch/9140221/
> >
> Packet creating/parsing should not be a part of controller driver. As
> the log of this patch says, today it is used for only display but in
> future it could work with other h/w as well, so it makes sense to have
> mailbox api do the message queuing, the controller driver do the
> send/receive and client drivers implement display and other h/w
> specific packaging of data (protocol handling).
> 
> So yes, I think this could use mailbox api.
> 
> Cheers.

I will try to rewrite CMDQ driver by mailbox framework and discuss with
you if I encounter other problems.

Thanks,
HS