linux-kernel - Re: [PATCH 1/2] drm/panel: Add Starry KR070PE2T

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Date:   Tue, 10 Mar 2020 21:10:24 +0200
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     Pascal Roeleven <dev@...calroeleven.nl>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, David Airlie <airlied@...ux.ie>,
        linux-sunxi@...glegroups.com, linux-kernel@...r.kernel.org,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] drm/panel: Add Starry KR070PE2T

On Tue, Mar 10, 2020 at 07:54:23PM +0100, Sam Ravnborg wrote:
> Hi Pascal.
> 
> Thanks for submitting.
> 
> On Tue, Mar 10, 2020 at 11:27:23AM +0100, Pascal Roeleven wrote:
> > The KR070PE2T is a 7" panel with a resolution of 800x480.
> > 
> > KR070PE2T is the marking present on the ribbon cable. As this panel is
> > probably available under different brands, this marking will catch
> > most devices.
> > 
> > Signed-off-by: Pascal Roeleven <dev@...calroeleven.nl>
> 
> A few things to improve.
> 
> The binding should be a separate patch.
> subject - shall start with dt-bindings:
> Shall be sent to deveicetree mailing list.
> 
> For panel we no longer accept .txt bindings.
> But the good news is that since the panel is simple,
> you only need to list your compatible in the file
> bindings/display/panel/panel-simple.yaml
> - must be en alphabetical order
> - vendor prefix must be present in vendor-prefixes
> 
> 
> 
> > ---
> >  .../display/panel/starry,kr070pe2t.txt        |  7 +++++
> >  drivers/gpu/drm/panel/panel-simple.c          | 26 +++++++++++++++++++
> >  2 files changed, 33 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt b/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
> > new file mode 100644
> > index 000000000..699ad5eb2
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/panel/starry,kr070pe2t.txt
> > @@ -0,0 +1,7 @@
> > +Starry 7" (800x480 pixels) LCD panel
> > +
> > +Required properties:
> > +- compatible: should be "starry,kr070pe2t"
> > +
> > +This binding is compatible with the simple-panel binding, which is specified
> > +in simple-panel.txt in this directory.
> > diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> > index e14c14ac6..027a2612b 100644
> > --- a/drivers/gpu/drm/panel/panel-simple.c
> > +++ b/drivers/gpu/drm/panel/panel-simple.c
> > @@ -2842,6 +2842,29 @@ static const struct panel_desc shelly_sca07010_bfn_lnn = {
> >  	.bus_format = MEDIA_BUS_FMT_RGB666_1X18,
> >  };
> >  
> > +static const struct drm_display_mode starry_kr070pe2t_mode = {
> > +	.clock = 33000,
> > +	.hdisplay = 800,
> > +	.hsync_start = 800 + 209,
> > +	.hsync_end = 800 + 209 + 1,
> > +	.htotal = 800 + 209 + 1 + 45,
> > +	.vdisplay = 480,
> > +	.vsync_start = 480 + 22,
> > +	.vsync_end = 480 + 22 + 1,
> > +	.vtotal = 480 + 22 + 1 + 22,
> > +	.vrefresh = 60,
> > +};
> 
> Please adjust so:
> vrefresh * htotal * vtotal == clock.
> I cannot say what needs to be adjusted.
> But we are moving away from specifying vrefresh and want the
> data to be OK.

This one actually looks OK to me. Unless I typoed the numbers
the timings give us a vrefresh of 59.58 which gets rounded to 60.
So no change once .vrefresh disappears AFAICS.

-- 
Ville Syrjälä
Intel