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drm/sun4i: backend: Use a specific function to check if a plane is supported 

Before this patch, it is assumed that a plane is supported either
through the frontend or through the backend alone. However, the DRM
interface does not allow finely reporting our hardware capabilities
and there are cases where neither are support.

In particular, some plane formats are supported by the backend and not
the frontend, so they can only be supported without scaling.

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/20181123092515.2511-8-paul.kocialkowski@bootlin.com
This commit is contained in:
Paul Kocialkowski 2018-11-23 10:24:39 +01:00 committed by Maxime Ripard
parent aaf3880b08
commit ab6985108a
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GPG Key ID: E3EF0D6F671851C5
1 changed files with 22 additions and 5 deletions
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27
drivers/gpu/drm/sun4i/sun4i_backend.c
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@ -477,6 +477,23 @@ static bool sun4i_backend_plane_uses_frontend(struct drm_plane_state *state)
return false;
}
static bool sun4i_backend_plane_is_supported(struct drm_plane_state *state,
bool *uses_frontend)
{
if (sun4i_backend_plane_uses_frontend(state)) {
*uses_frontend = true;
return true;
}
*uses_frontend = false;
/* Scaling is not supported without the frontend. */
if (sun4i_backend_plane_uses_scaler(state))
return false;
return true;
}
static void sun4i_backend_atomic_begin(struct sunxi_engine *engine,
struct drm_crtc_state *old_state)
{
@ -517,14 +534,14 @@ static int sun4i_backend_atomic_check(struct sunxi_engine *engine,
struct drm_framebuffer *fb = plane_state->fb;
struct drm_format_name_buf format_name;
if (sun4i_backend_plane_uses_frontend(plane_state)) {
if (!sun4i_backend_plane_is_supported(plane_state,
&layer_state->uses_frontend))
return -EINVAL;
if (layer_state->uses_frontend) {
DRM_DEBUG_DRIVER("Using the frontend for plane %d\n",
plane->index);
layer_state->uses_frontend = true;
num_frontend_planes++;
} else {
layer_state->uses_frontend = false;
}
DRM_DEBUG_DRIVER("Plane FB format is %s\n",