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drm/sun4i: frontend: Replace ARGB with XRGB as supported format

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The frontend documentation (for the A33) mentions that ARGB is supported
as output, but with the alpha component always set to 0xff. In practice,
this means that the alpha component cannot be preserved when going
through the frontend. Since the information is lost, ARGB is not
properly supported.

As a result, expose the matching format supported by the frontend (both
for input and output) as XRGB instead of ARGB.

Since ARGB was the selected format for connecting the frontend to the
backend, change it to XRGB to reflect this as well.

The A31 and A80 SoCs apparently have a bit to enable proper alpha,
but this is not supported at this point (see the comment already in the
code).

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181123092515.2511-3-paul.kocialkowski@bootlin.com
This commit is contained in:
Paul Kocialkowski 2018-11-23 10:24:34 +01:00 committed by Maxime Ripard
parent 686d263856
commit b79a3a97f6
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
2 changed files with 3 additions and 4 deletions
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3
drivers/gpu/drm/sun4i/sun4i_frontend.c
View File

@ -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;

4
drivers/gpu/drm/sun4i/sun4i_layer.c
View File

@ -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,
DRM_FORMAT_ARGB8888);
DRM_FORMAT_XRGB8888);
sun4i_frontend_enable(frontend);
} else {
sun4i_backend_update_layer_formats(backend, layer->id, plane);