linux-kernel - Re: drm/sun4i: Add missing pixel formats to the vi layer

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Date:   Fri, 20 Sep 2019 23:22:44 +0300
From:   Roman Stratiienko <roman.stratiienko@...ballogic.com>
To:     Jernej Škrabec <jernej.skrabec@...l.net>
Cc:     linux-kernel@...r.kernel.org, Maxime Ripard <mripard@...nel.org>,
        dri-devel@...ts.freedesktop.org
Subject: Re: drm/sun4i: Add missing pixel formats to the vi layer

On Thu, Sep 19, 2019 at 9:53 PM Jernej Škrabec <jernej.skrabec@...l.net> wrote:
>
> Hi!
>
> Dne sreda, 18. september 2019 ob 13:05:41 CEST je
> roman.stratiienko@...ballogic.com napisal(a):
> > From: Roman Stratiienko <roman.stratiienko@...ballogic.com>
> >
> > According to Allwinner DE2.0 Specification REV 1.0, vi layer supports the
> > following pixel formats:  ABGR_8888, ARGB_8888, BGRA_8888, RGBA_8888
>
> It's true that DE2 VI layers support those formats, but it wouldn't change
> anything because alpha blending is not supported by those planes. These
> formats were deliberately left out because their counterparts without alpha
> exist, for example ABGR8888 <-> XBGR8888. It would also confuse user, which
> would expect that alpha blending works if format with alpha channel is
> selected.
>
> Admittedly some formats with alpha are still reported as supported due to lack
> of their counterparts without alpha, but I'm fine with removing them for
> consistency.

Why not to replace 'A' with 'X' on all relevant formats and map them
to corresponding index marked with 'A' (that behaves as true 'X' for
vi)

>
> Best regards,
> Jernej
>
> >
> > Signed-off-by: Roman Stratiienko <roman.stratiienko@...ballogic.com>
> > ---
> >  drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> > b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c index bd0e6a52d1d8..07c27e6a4b77
> > 100644
> > --- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> > +++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> > @@ -404,17 +404,21 @@ static const struct drm_plane_funcs
> > sun8i_vi_layer_funcs = { static const u32 sun8i_vi_layer_formats[] = {
> >       DRM_FORMAT_ABGR1555,
> >       DRM_FORMAT_ABGR4444,
> > +     DRM_FORMAT_ABGR8888,
> >       DRM_FORMAT_ARGB1555,
> >       DRM_FORMAT_ARGB4444,
> > +     DRM_FORMAT_ARGB8888,
> >       DRM_FORMAT_BGR565,
> >       DRM_FORMAT_BGR888,
> >       DRM_FORMAT_BGRA5551,
> >       DRM_FORMAT_BGRA4444,
> > +     DRM_FORMAT_BGRA8888,
> >       DRM_FORMAT_BGRX8888,
> >       DRM_FORMAT_RGB565,
> >       DRM_FORMAT_RGB888,
> >       DRM_FORMAT_RGBA4444,
> >       DRM_FORMAT_RGBA5551,
> > +     DRM_FORMAT_RGBA8888,
> >       DRM_FORMAT_RGBX8888,
> >       DRM_FORMAT_XBGR8888,
> >       DRM_FORMAT_XRGB8888,
>
>
>
>


-- 
Best regards,
Roman Stratiienko
Global Logic Inc.