From: Horng-Shyang Liao <hs.liao-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
To: Jassi Brar <jassisinghbrar-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: Matthias Brugger
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Subject: Re: [PATCH v8 2/3] CMDQ: Mediatek CMDQ driver
Date: Mon, 6 Jun 2016 17:33:53 +0800 [thread overview]
Message-ID: <1465205633.25607.33.camel@mtksdaap41> (raw)
In-Reply-To: <CABb+yY2aOncqM-fOiq_ZBink0Fth6Drd30ZMe3-bXNkodW2dVA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
Hi Matthias, Jassi,
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-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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.
Let me use display as an example to do some further explanation
about CMDQ in advance. You can think CMDQ is a shadow register
replacement. Therefore, we use cmdq_rec_write(_mask), cmdq_rec_wfe, and
cmdq_rec_clear_event instead of accessing registers, and use
cmdq_rec_flush(_async) instead of atomic swap.
If we use mailbox to do the message queue, we can use mailbox framework
to implement flush and callback. However, I don't think mailbox is
suitable for cmdq_rec_write(_mask), cmdq_rec_wfe, and
cmdq_rec_clear_event since they are just record some commands. Is this
the same as your comment "Packet creating/parsing should not be a part
of controller driver."?
Therefore, do you mean we use mailbox framework to implement flush and
callback and keep other interfaces? Just want to confirm that I get the
correct idea from you. Many thanks for your kindly reply.
Thanks,
HS
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next prev parent reply other threads:[~2016-06-06 9:33 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-30 3:19 [PATCH v8 0/3] Mediatek MT8173 CMDQ support HS Liao
2016-05-30 3:19 ` [PATCH v8 2/3] CMDQ: Mediatek CMDQ driver HS Liao
2016-05-30 6:49 ` CK Hu
2016-05-30 9:38 ` Horng-Shyang Liao
2016-05-30 15:31 ` Matthias Brugger
2016-05-31 8:36 ` Horng-Shyang Liao
2016-05-31 20:04 ` Matthias Brugger
2016-06-01 9:57 ` Horng-Shyang Liao
2016-06-02 8:46 ` Matthias Brugger
2016-06-03 6:12 ` Horng-Shyang Liao
2016-06-03 11:18 ` Matthias Brugger
2016-06-03 12:13 ` Horng-Shyang Liao
2016-06-03 13:11 ` Matthias Brugger
2016-06-07 16:59 ` Matthias Brugger
[not found] ` <5756FD73.3050607-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-08 5:40 ` Horng-Shyang Liao
2016-06-08 10:45 ` Matthias Brugger
2016-06-08 12:25 ` Horng-Shyang Liao
2016-06-08 15:35 ` Matthias Brugger
[not found] ` <57583B45.2080504-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-14 7:44 ` Horng-Shyang Liao
2016-06-14 10:17 ` Matthias Brugger
2016-06-14 12:07 ` Horng-Shyang Liao
2016-06-17 8:28 ` Horng-Shyang Liao
2016-06-17 15:57 ` Matthias Brugger
[not found] ` <57641E01.3070205-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-21 5:52 ` Horng-Shyang Liao
2016-06-21 13:41 ` Matthias Brugger
[not found] ` <5769440D.5030505-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-22 5:43 ` Horng-Shyang Liao
2016-06-22 9:58 ` Matthias Brugger
2016-06-17 16:14 ` Matthias Brugger
[not found] ` <57516774.5080008-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-03 13:11 ` Jassi Brar
[not found] ` <CABb+yY2aOncqM-fOiq_ZBink0Fth6Drd30ZMe3-bXNkodW2dVA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-06-06 9:33 ` Horng-Shyang Liao [this message]
2016-06-06 13:17 ` Jassi Brar
2016-06-07 2:45 ` Horng-Shyang Liao
2016-06-07 17:04 ` Matthias Brugger
[not found] ` <5756FE9B.6020107-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-06-08 5:09 ` Horng-Shyang Liao
[not found] ` <1464578397-29743-3-git-send-email-hs.liao-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2016-06-20 10:41 ` CK Hu
2016-06-20 11:22 ` Horng-Shyang Liao
2016-06-21 2:03 ` CK Hu
2016-06-21 7:46 ` Horng-Shyang Liao
2016-06-24 11:39 ` Horng-Shyang Liao
2016-06-27 2:00 ` CK Hu
2016-06-23 6:03 ` CK Hu
2016-06-23 7:54 ` Horng-Shyang Liao
2016-06-23 11:44 ` CK Hu
[not found] ` <1464578397-29743-1-git-send-email-hs.liao-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
2016-05-30 3:19 ` [PATCH v8 1/3] dt-bindings: soc: Add documentation for the MediaTek GCE unit HS Liao
2016-05-30 3:19 ` [PATCH v8 3/3] arm64: dts: mt8173: Add GCE node HS Liao
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