linux-kernel - Re: [Freedreno] [PATCH v6 0/5] Add support for DisplayPort driver on

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Message-ID: <CAOCk7NrX9Lk6GQKXcFMd1CHHu7CjVg7hUAwt1LyNFdVHHGPO-g@mail.gmail.com>
Date:   Mon, 15 Jun 2020 17:04:57 -0600
From:   Jeffrey Hugo <jeffrey.l.hugo@...il.com>
To:     tanmay@...eaurora.org
Cc:     Stephen Boyd <swboyd@...omium.org>,
        DTML <devicetree@...r.kernel.org>, aravindh@...eaurora.org,
        MSM <linux-arm-msm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:DRM PANEL DRIVERS" <dri-devel@...ts.freedesktop.org>,
        Rob Clark <robdclark@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Sean Paul <seanpaul@...omium.org>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        freedreno <freedreno@...ts.freedesktop.org>,
        Sam Ravnborg <sam@...nborg.org>
Subject: Re: [Freedreno] [PATCH v6 0/5] Add support for DisplayPort driver on

On Mon, Jun 15, 2020 at 4:51 PM <tanmay@...eaurora.org> wrote:
>
> On 2020-06-12 16:26, Stephen Boyd wrote:
>
> Thanks for reviews Stephen.
>
> > Quoting Tanmay Shah (2020-06-11 18:50:25)
> >> These patches add support for Display-Port driver on SnapDragon
> >> hardware. It adds
> >> DP driver and DP PLL driver files along with the needed device-tree
> >> bindings.
> >>
> >> The block diagram of DP driver is shown below:
> >>
> >>
> >>                  +-------------+
> >>                  |DRM FRAMEWORK|
> >>                  +------+------+
> >>                         |
> >>                    +----v----+
> >>                    | DP DRM  |
> >>                    +----+----+
> >>                         |
> >>                    +----v----+
> >>      +------------+|   DP    +----------++------+
> >>      +        +---+| DISPLAY |+---+      |      |
> >>      |        +    +-+-----+-+    |      |      |
> >>      |        |      |     |      |      |      |
> >>      |        |      |     |      |      |      |
> >>      |        |      |     |      |      |      |
> >>      v        v      v     v      v      v      v
> >>  +------+ +------+ +---+ +----+ +----+ +---+ +-----+
> >>  |  DP  | |  DP  | |DP | | DP | | DP | |DP | | DP  |
> >>  |PARSER| | HPD  | |AUX| |LINK| |CTRL| |PHY| |POWER|
> >>  +--+---+ +---+--+ +---+ +----+ +--+-+ +-+-+ +-----+
> >>     |                              |     |
> >>  +--v---+                         +v-----v+
> >>  |DEVICE|                         |  DP   |
> >>  | TREE |                         |CATALOG|
> >>  +------+                         +---+---+
> >>                                       |
> >>                                   +---v----+
> >>                                   |CTRL/PHY|
> >>                                   |   HW   |
> >>                                   +--------+
> >>
> >
> > I've never seen a block diagram for a driver before...
> >
> It is here for v5. https://patchwork.freedesktop.org/series/74312/

I think Stephen is nitpicking your wording, and you seem to not be
understanding his comment.  I'm sorry if I am mistaken.

The "DP driver" would seem to refer to the linux software driver you
are proposing patches for, however this diagram looks like a hardware
diagram of the various hardware blocks that the Linux driver code (the
"DP driver") is expected to interact with.  I believe you should
re-word "The block diagram of DP driver is shown below:" to be more
specific of what you are describing with your figure.  IE your words
say this is a block diagram of the software, when it looks like it is
a block diagram of the hardware.