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

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Date:   Mon, 24 Oct 2016 16:40:14 +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 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?

> > +               break;
> > +
> >         case DRM_FORMAT_XRGB8888:
> >                 *mode = SUN4I_BACKEND_LAY_FBFMT_XRGB8888;
> >                 break;
> > @@ -104,6 +120,10 @@ static int sun4i_backend_drm_format_to_layer(struct drm_plane *plane,
> >                 *mode = SUN4I_BACKEND_LAY_FBFMT_RGB888;
> >                 break;
> >
> > +       case DRM_FORMAT_RGB565:
> > +               *mode = SUN4I_BACKEND_LAY_FBFMT_RGB565;
> > +               break;
> > +
> >         default:
> >                 return -EINVAL;
> >         }
> > diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c b/drivers/gpu/drm/sun4i/sun4i_layer.c
> > index f0035bf5efea..5d53c977bca5 100644
> > --- a/drivers/gpu/drm/sun4i/sun4i_layer.c
> > +++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
> > @@ -73,12 +73,18 @@ static const struct drm_plane_funcs sun4i_backend_layer_funcs = {
> >  static const uint32_t sun4i_backend_layer_formats_primary[] = {
> >         DRM_FORMAT_ARGB8888,
> >         DRM_FORMAT_RGB888,
> > +       DRM_FORMAT_RGB565,
> >         DRM_FORMAT_XRGB8888,
> >  };
> >
> >  static const uint32_t sun4i_backend_layer_formats_overlay[] = {
> >         DRM_FORMAT_ARGB8888,
> > +       DRM_FORMAT_ARGB4444,
> > +       DRM_FORMAT_ARGB1555,
> > +       DRM_FORMAT_RGBA5551,
> > +       DRM_FORMAT_RGBA4444,
> >         DRM_FORMAT_RGB888,
> > +       DRM_FORMAT_RGB565,
> >         DRM_FORMAT_XRGB8888,
> 
> Could you explain in the commit log why these 2 aren't the same?

Yep, I will.

Thanks!
Maxime

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

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