linux-kernel - Re: [PATCH] drm/sun4i: Add a few formats

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Message-ID: <20161027143505.rblgbz5uqjynrtjk@lukather>
Date:   Thu, 27 Oct 2016 16:35:05 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>
Subject: Re: [PATCH] drm/sun4i: Add a few formats

Hi,

On Tue, Oct 25, 2016 at 08:42:26AM +0800, Chen-Yu Tsai wrote:
> On Mon, Oct 24, 2016 at 10:40 PM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > Hi,
> >
> > On Fri, Oct 21, 2016 at 11:15:32AM +0800, Chen-Yu Tsai wrote:
> >> On Tue, Oct 18, 2016 at 4:46 PM, Maxime Ripard
> >> <maxime.ripard@...e-electrons.com> wrote:
> >> > The planes can do more than what was previously exposed. Add support for
> >> > them.
> >> >
> >> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
> >> > ---
> >> >  drivers/gpu/drm/sun4i/sun4i_backend.c | 20 ++++++++++++++++++++
> >> >  drivers/gpu/drm/sun4i/sun4i_layer.c   |  6 ++++++
> >> >  2 files changed, 26 insertions(+)
> >> >
> >> > diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c
> >> > index afb7ddf660ef..b184a476a480 100644
> >> > --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> >> > +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> >> > @@ -96,6 +96,22 @@ static int sun4i_backend_drm_format_to_layer(struct drm_plane *plane,
> >> >                 *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB8888;
> >> >                 break;
> >> >
> >> > +       case DRM_FORMAT_ARGB4444:
> >> > +               *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB4444;
> >> > +               break;
> >> > +
> >> > +       case DRM_FORMAT_ARGB1555:
> >> > +               *mode = SUN4I_BACKEND_LAY_FBFMT_ARGB1555;
> >> > +               break;
> >> > +
> >> > +       case DRM_FORMAT_RGBA5551:
> >> > +               *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA5551;
> >> > +               break;
> >> > +
> >> > +       case DRM_FORMAT_RGBA4444:
> >> > +               *mode = SUN4I_BACKEND_LAY_FBFMT_RGBA4444;
> >>
> >> The A20 manual only lists ARGB4444, not RGBA4444. There might be
> >> some discrepancy here. We can deal with them
> >
> > Hmm, yes, that's weird. But I guess this would be part of porting it
> > to the A20.
> >
> >> Also there are some more formats missing from the list, could you
> >> add them as well?
> >
> > Which one do you refer to?
> 
> RGB556 and RGB655.

These formats are not supported by Linux yet though.

Thanks,
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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