From: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
To: Chen-Yu Tsai <wens@csie.org>
Cc: David Airlie <airlied@linux.ie>,
linux-kernel <linux-kernel@vger.kernel.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Daniel Vetter <daniel.vetter@intel.com>,
Maxime Ripard <maxime.ripard@free-electrons.com>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH 03/10] drm/sun4i: Don't pretend to handle ARGB8888 with the frontend
Date: Thu, 22 Mar 2018 09:41:04 +0100 [thread overview]
Message-ID: <1521708064.1175.5.camel@bootlin.com> (raw)
In-Reply-To: <CAGb2v66ih3VaMcqUcuEQC9WKoULgFPUx8o7GjECGeuUv8a7d+g@mail.gmail.com>
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Hi,
On Thu, 2018-03-22 at 16:37 +0800, Chen-Yu Tsai wrote:
> On Thu, Mar 22, 2018 at 4:23 PM, Paul Kocialkowski
> <paul.kocialkowski@bootlin.com> wrote:
> > Hi Chen-Yu,
> >
> > On Thu, 2018-03-22 at 14:47 +0800, Chen-Yu Tsai wrote:
> > > On Wed, Mar 21, 2018 at 11:28 PM, Paul Kocialkowski
> > > <paul.kocialkowski@bootlin.com> wrote:
> > > > It turns out that the frontend is not capable of preserving the
> > > > alpha
> > > > component (that is always set to 0xff), so only support XRGB8888
> > > > instead.
> > > >
> > > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > > > ---
> > > > drivers/gpu/drm/sun4i/sun4i_backend.c | 4 ++++
> > > > drivers/gpu/drm/sun4i/sun4i_frontend.c | 3 +--
> > > > drivers/gpu/drm/sun4i/sun4i_layer.c | 4 ++--
> > > > 3 files changed, 7 insertions(+), 4 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c
> > > > b/drivers/gpu/drm/sun4i/sun4i_backend.c
> > > > index b98dafda52f8..274a1db6fa8e 100644
> > > > --- a/drivers/gpu/drm/sun4i/sun4i_backend.c
> > > > +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c
> > > > @@ -440,6 +440,10 @@ static bool
> > > > sun4i_backend_plane_uses_frontend(struct drm_plane_state *state)
> > > > if (IS_ERR(backend->frontend))
> > > > return false;
> > > >
> > > > + /*
> > > > + * TODO: Don't use the frontend for x2/x4 scaling and
> > > > allow
> > > > RGB formats
> > > > + * with an alpha component then.
> > >
> > > This and the commit log are kind of conflicting. Is it just the
> > > scalar
> > > that doesn't
> > > work with an alpha component, or the whole frontend?
> >
> > It's the whole frontend that does not support alpha in its output
> > formats. I'm talking about scaling here because that's still the
> > main
> > reason to use the frontend. On the other hand, the backend allows
> > integer scaling with an alpha component, hence the comment.
>
> I see. I parsed the TODO note incorrectly.
>
> > Do you think I need to rework the comment/commit log?
>
> I think
>
> Allow integer scaling with alpha using just the backend.
>
> would be slightly clearer.
I agree, will do in the next version!
Cheers,
Paul
> > Thanks for the review,
> >
> > Paul
> >
> > > > + */
> > > > return sun4i_backend_plane_uses_scaler(state);
> > > > }
> > > >
> > > > diff --git a/drivers/gpu/drm/sun4i/sun4i_frontend.c
> > > > b/drivers/gpu/drm/sun4i/sun4i_frontend.c
> > > > index ddf6cfa6dd23..3ea925584891 100644
> > > > --- a/drivers/gpu/drm/sun4i/sun4i_frontend.c
> > > > +++ b/drivers/gpu/drm/sun4i/sun4i_frontend.c
> > > > @@ -107,7 +107,7 @@ EXPORT_SYMBOL(sun4i_frontend_update_buffer);
> > > > static int sun4i_frontend_drm_format_to_input_fmt(uint32_t fmt,
> > > > u32
> > > > *val)
> > > > {
> > > > switch (fmt) {
> > > > - case DRM_FORMAT_ARGB8888:
> > > > + case DRM_FORMAT_XRGB8888:
> > > > *val = 5;
> > > > return 0;
> > > >
> > > > @@ -120,7 +120,6 @@ static int
> > > > sun4i_frontend_drm_format_to_output_fmt(uint32_t fmt, u32 *val)
> > > > {
> > > > switch (fmt) {
> > > > case DRM_FORMAT_XRGB8888:
> > > > - case DRM_FORMAT_ARGB8888:
> > > > *val = 2;
> > > > return 0;
> > > >
> > > > diff --git a/drivers/gpu/drm/sun4i/sun4i_layer.c
> > > > b/drivers/gpu/drm/sun4i/sun4i_layer.c
> > > > index eb93df445a10..15238211a61a 100644
> > > > --- a/drivers/gpu/drm/sun4i/sun4i_layer.c
> > > > +++ b/drivers/gpu/drm/sun4i/sun4i_layer.c
> > > > @@ -100,9 +100,9 @@ static void
> > > > sun4i_backend_layer_atomic_update(struct drm_plane *plane,
> > > > sun4i_frontend_update_coord(frontend, plane);
> > > > sun4i_frontend_update_buffer(frontend, plane);
> > > > sun4i_frontend_update_formats(frontend, plane,
> > > > - DRM_FORMAT_ARGB888
> > > > 8);
> > > > + DRM_FORMAT_XRGB888
> > > > 8);
> > > > sun4i_backend_update_layer_frontend(backend,
> > > > layer-
> > > > > id, plane,
> > > >
> > > > - DRM_FORMAT_A
> > > > RGB8
> > > > 888);
> > > > + DRM_FORMAT_X
> > > > RGB8
> > > > 888);
> > > > sun4i_frontend_enable(frontend);
> > > > } else {
> > > > sun4i_backend_update_layer_formats(backend,
> > > > layer-
> > > > > id, plane);
> > > >
> > > > --
> > > > 2.16.2
> > > >
> > >
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel@lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
> >
> > --
> > Paul Kocialkowski, Bootlin (formerly Free Electrons)
> > Embedded Linux and kernel engineering
> > https://bootlin.com
--
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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next prev parent reply other threads:[~2018-03-22 8:42 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-21 15:28 [PATCH 00/10] drm/sun4i: Frontend YUV and MB32 tile modifier support Paul Kocialkowski
2018-03-21 15:28 ` [PATCH 01/10] drm/sun4i: Disable frontend video channel before enabling a layer Paul Kocialkowski
2018-03-23 9:53 ` Maxime Ripard
2018-03-21 15:28 ` [PATCH 02/10] drm/sun4i: Disable YUV channel when using the frontend and set interlace Paul Kocialkowski
2018-03-23 9:55 ` Maxime Ripard
2018-03-27 8:00 ` Paul Kocialkowski
2018-03-27 8:17 ` Maxime Ripard
2018-03-27 8:44 ` Paul Kocialkowski
2018-03-27 8:48 ` Chen-Yu Tsai
2018-03-27 9:18 ` Maxime Ripard
2018-03-27 9:21 ` Paul Kocialkowski
2018-03-21 15:28 ` [PATCH 03/10] drm/sun4i: Don't pretend to handle ARGB8888 with the frontend Paul Kocialkowski
2018-03-22 6:47 ` Chen-Yu Tsai
2018-03-22 8:23 ` Paul Kocialkowski
2018-03-22 8:37 ` Chen-Yu Tsai
2018-03-22 8:41 ` Paul Kocialkowski [this message]
2018-03-22 16:12 ` Maxime Ripard
2018-03-22 16:18 ` Paul Kocialkowski
2018-03-21 15:28 ` [PATCH 04/10] drm/sun4i: Explicitly list and check formats supported by the backend Paul Kocialkowski
2018-03-23 10:03 ` Maxime Ripard
2018-03-27 8:08 ` Paul Kocialkowski
2018-03-29 7:56 ` Maxime Ripard
2018-10-16 13:55 ` Paul Kocialkowski
2018-10-17 15:33 ` Maxime Ripard
2018-03-21 15:28 ` [PATCH 05/10] drm/sun4i: Explicitly list and check formats supported by the frontend Paul Kocialkowski
2018-03-23 10:06 ` Maxime Ripard
2018-03-27 8:24 ` Paul Kocialkowski
2018-03-29 9:03 ` Maxime Ripard
2018-10-16 13:57 ` Paul Kocialkowski
2018-03-21 15:29 ` [PATCH 06/10] drm/sun4i: Move and extend format-related helpers and tables Paul Kocialkowski
2018-03-23 10:13 ` Maxime Ripard
2018-03-27 8:27 ` Paul Kocialkowski
2018-03-27 14:47 ` Maxime Ripard
2018-03-21 15:29 ` [PATCH 07/10] drm/sun4i: Add support for YUV formats through the frontend Paul Kocialkowski
2018-03-23 10:30 ` Maxime Ripard
2018-03-27 8:39 ` Paul Kocialkowski
2018-03-21 15:29 ` [PATCH 08/10] drm/fourcc: Add definitions for Allwinner vendor and MB32 tiled format Paul Kocialkowski
2018-03-21 16:47 ` Daniel Stone
2018-03-22 8:05 ` Paul Kocialkowski
2018-03-21 15:29 ` [PATCH 09/10] drm/sun4i: Add a dedicated ioctl call for allocating tiled buffers Paul Kocialkowski
2018-03-23 10:48 ` Maxime Ripard
2018-03-27 8:41 ` Paul Kocialkowski
2018-03-27 14:48 ` Maxime Ripard
2018-03-21 15:29 ` [PATCH 10/10] drm/sun4i: Add support for YUV-based formats in MB32 tiles Paul Kocialkowski
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