linux-kernel - Re: [PATCH 1/3] drm/panel: make LVDS panel driver DPI capable

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Date:   Mon, 20 Jan 2020 09:57:17 +0000
From:   Oleksandr Suvorov <oleksandr.suvorov@...adex.com>
To:     Sam Ravnborg <sam@...nborg.org>
CC:     Oleksandr Suvorov <oleksandr.suvorov@...adex.com>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        Igor Opanyuk <igor.opanyuk@...adex.com>,
        Thierry Reding <thierry.reding@...il.com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH 1/3] drm/panel: make LVDS panel driver DPI capable

Hi Sam,

On Sat, Jan 18, 2020 at 3:04 PM Sam Ravnborg <sam@...nborg.org> wrote:
> >
> > The LVDS panel driver has almost everything which is required to
> > describe a simple parallel RGB panel (also known as DPI, Display
> > Pixel Interface).
> >
> > ---
>
> There are a few high-level things we need to have sorted out.
>
> The driver, when this patch is added, assumes that certain properties
> are now mandatory when using the panel-dpi compatible.
>   - data-mapping
>   - width-mm
>   - height-mm
>   - panel-timing
>
> But this does not match the panel-dpi binding.
> So we need the panel-dpi binding updated first.
>
>
> The current driver specify the connector type in drm_panel_init().
> But a DPI panel is assumed to use a DRM_MODE_CONNECTOR_DPI,
> and not a DRM_MODE_CONNECTOR_LVDS.
> So the drm_panel_init() call needs to take into account the type
> of binding.
>
Thanks, I'll fix it in 2nd version.
>
> > @@ -257,7 +279,7 @@ static struct platform_driver panel_lvds_driver = {
> >       .probe          = panel_lvds_probe,
> >       .remove         = panel_lvds_remove,
> >       .driver         = {
> > -             .name   = "panel-lvds",
> > +             .name   = "panel-generic",
>
> I think changing the name of the driver like this is an UAPI change,
> which is not OK

I see 2 simple ways there:
- keep the original platform driver name;
- fork panel-lvds driver as panel-generic driver with dpi support.

What solution do you prefer?

> >               .of_match_table = panel_lvds_of_table,
> >       },
> >  };
>
>         Sam

--
Best regards
Oleksandr Suvorov

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