Our operations were missing some documentation to explain what was expected from them.
Let's make that clearer.
Signed-off-by: Maxime Ripard maxime.ripard@free-electrons.com --- drivers/gpu/drm/sun4i/sun4i_backend.c | 2 +- drivers/gpu/drm/sun4i/sunxi_engine.h | 51 ++++++++++++++++++++++++++-- 2 files changed, 50 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c index c99d1a7e815a..f971d3fb5ee4 100644 --- a/drivers/gpu/drm/sun4i/sun4i_backend.c +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c @@ -93,7 +93,7 @@ void sun4i_backend_layer_enable(struct sun4i_backend *backend, static int sun4i_backend_drm_format_to_layer(struct drm_plane *plane, u32 format, u32 *mode) { - if ((plane->type == DRM_PLANE_TYPE_PRIMARY) && + if (plane && (plane->type == DRM_PLANE_TYPE_PRIMARY) && (format == DRM_FORMAT_ARGB8888)) format = DRM_FORMAT_XRGB8888;
diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h index 4cb70ae65c79..36c8388b1646 100644 --- a/drivers/gpu/drm/sun4i/sunxi_engine.h +++ b/drivers/gpu/drm/sun4i/sunxi_engine.h @@ -15,13 +15,60 @@ struct drm_device;
struct sunxi_engine;
+/** + * struct sunxi_engine_ops - helper operations for sunXi engines + * + * These hooks are used by the common part of the DRM driver to + * implement the proper behaviour. + */ struct sunxi_engine_ops { + /** + * @apply_color_correction: + * + * This callback will enable the color correction in the + * backend. This is useful only for the composite output. + * + * This function is optional. + */ + void (*apply_color_correction)(struct sunxi_engine *engine); + + /** + * @commit: + * + * This callback will trigger the hardware switch to commit + * the new configuration that has been setup during the next + * vblank period. + * + * This function is optional. + */ void (*commit)(struct sunxi_engine *engine); + + /** + * @disable_color_correction: + * + * This callback will stop the color correction in the + * backend. This is useful only for the composite output. + * + * This function is optional. + */ + void (*disable_color_correction)(struct sunxi_engine *engine); + + /** + * @layers_init: + * + * This callback is used to allocate, initialize and register + * the layers supported by that backend. + * + * This function is mandatory. + * + * RETURNS: + * + * The array of struct drm_plane backing the layers, or an + * error pointer on failure. + */ struct drm_plane **(*layers_init)(struct drm_device *drm, struct sunxi_engine *engine);
- void (*apply_color_correction)(struct sunxi_engine *engine); - void (*disable_color_correction)(struct sunxi_engine *engine); };
/**