Re: [PATCH v6 12/16] dt-bindings: display: mediatek: color: add compatible for MT8195

Moudy Ho (何宗原)
2023-09-28T02:53:03Z

On Wed, 2023-09-27 at 10:47 +0100, Conor Dooley wrote:
> On Wed, Sep 27, 2023 at 07:19:28AM +0000, Moudy Ho (何宗原) wrote:
> > On Fri, 2023-09-22 at 16:51 +0100, Conor Dooley wrote:
> > > On Fri, Sep 22, 2023 at 04:49:14PM +0100, Conor Dooley wrote:
> > > > On Fri, Sep 22, 2023 at 03:21:12PM +0800, Moudy Ho wrote:
> > > > > Add a compatible string for the COLOR block in MediaTek
> > > > > MT8195
> > > > > that
> > > > > is controlled by MDP3.
> > > > >
> > > > > Signed-off-by: Moudy Ho <moudy.ho@mediatek.com>
> > > > > ---
> > > > > .../devicetree/bindings/display/mediatek/mediatek,color.yaml
> > > > >
> > > > > | 1 +
> > > > > 1 file changed, 1 insertion(+)
> > > > >
> > > > > diff --git
> > > > > a/Documentation/devicetree/bindings/display/mediatek/mediatek
> > > > > ,col
> > > > > or.yaml
> > > > > b/Documentation/devicetree/bindings/display/mediatek/mediatek
> > > > > ,col
> > > > > or.yaml
> > > > > index f21e44092043..b886ca0d89ea 100644
> > > > > ---
> > > > > a/Documentation/devicetree/bindings/display/mediatek/mediatek
> > > > > ,col
> > > > > or.yaml
> > > > > +++
> > > > > b/Documentation/devicetree/bindings/display/mediatek/mediatek
> > > > > ,col
> > > > > or.yaml
> > > > > @@ -26,6 +26,7 @@ properties:
> > > > > - mediatek,mt2701-disp-color
> > > > > - mediatek,mt8167-disp-color
> > > > > - mediatek,mt8173-disp-color
> > > > > + - mediatek,mt8195-mdp3-color
> > > >
> > > > How come this one is a "mdp3" not a "disp"?
> > >
> > > I don't know what mdp3 means & googling gives me no answers.
> > > What's
> > > the
> > > "disp" one controlled by, since it isn't controlled by mdp3?
> > >
> >
> > Hi Conor,
> >
> > Mediatek's Media Data Path ver.3 (MDP3) is associated with MMSYS
> > and
> > acts as an independent driver that operates between VDEC and DISP.
> > By controlling multiple components, it carries out tasks like
> > converting color formats, resizing, and applying specific Picture
> > Quality (PQ) effects.
> > The driver can be found at "driver/media/platform/mediatek/mdp3".
> > Since the same hardware components are configured in both MDP3 and
> > DISP, considering previous discussions, I attemped to integrate
> > into a
> > single binding, named after the controlling user.
>
> I'm still kinda struggling to understand this. Do you mean that the
> hardware can be controlled by either of the disp and mdp3 drivers,
> and
> a compatible containing "disp" would use one driver, and one
> containing
> "mdp3" would use another?
>

Hi Conor,

Sorry for any confusion caused by the software information. In the
video pipeline, after decoding, the data flows sequentially through two
subsystems: MDP and DISP. Each subsystems has multiple IPs, with some
serving the same functionality as COLOR mentioned here. However, these
IPs cannot be controlled by different subsystems. Therefore, I included
the name of the subsystem after SoC to identify the configuration's
location. Is this approach feasible?

Sincerely,
Moudy