On Thu, Mar 22, 2018 at 4:23 PM, Paul Kocialkowski
<paul.kocialkowski@xxxxxxxxxxx> 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@xxxxxxxxxxx> 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@xxxxxxxxxxx>
>> > ---
>> > 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.
Thanks
ChenYu
> 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_ARGB8888);
>> > + DRM_FORMAT_XRGB8888);
>> > sun4i_backend_update_layer_frontend(backend, layer-
>> > >id, plane,
>> > - DRM_FORMAT_ARGB8
>> > 888);
>> > + DRM_FORMAT_XRGB8
>> > 888);
>> > sun4i_frontend_enable(frontend);
>> > } else {
>> > sun4i_backend_update_layer_formats(backend, layer-
>> > >id, plane);
>> > --
>> > 2.16.2
>> >
>>
>> _______________________________________________
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> --
> Paul Kocialkowski, Bootlin (formerly Free Electrons)
> Embedded Linux and kernel engineering
> https://bootlin.com
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