Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/gpu/drm/drm_blend.c b/drivers/gpu/drm/drm_blend.c
index a16a74d..37ac168 100644
--- a/drivers/gpu/drm/drm_blend.c
+++ b/drivers/gpu/drm/drm_blend.c
@@ -23,13 +23,16 @@
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
-#include <drm/drmP.h>
-#include <drm/drm_atomic.h>
-#include <drm/drm_blend.h>
+
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/sort.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_blend.h>
+#include <drm/drm_device.h>
+#include <drm/drm_print.h>
+
#include "drm_crtc_internal.h"
/**
@@ -101,12 +104,80 @@
* Without this property the rectangle is only scaled, but not rotated or
* reflected.
*
+ * Possbile values:
+ *
+ * "rotate-<degrees>":
+ * Signals that a drm plane is rotated <degrees> degrees in counter
+ * clockwise direction.
+ *
+ * "reflect-<axis>":
+ * Signals that the contents of a drm plane is reflected along the
+ * <axis> axis, in the same way as mirroring.
+ *
+ * reflect-x::
+ *
+ * |o | | o|
+ * | | -> | |
+ * | v| |v |
+ *
+ * reflect-y::
+ *
+ * |o | | ^|
+ * | | -> | |
+ * | v| |o |
+ *
* zpos:
* Z position is set up with drm_plane_create_zpos_immutable_property() and
* drm_plane_create_zpos_property(). It controls the visibility of overlapping
* planes. Without this property the primary plane is always below the cursor
* plane, and ordering between all other planes is undefined.
*
+ * pixel blend mode:
+ * Pixel blend mode is set up with drm_plane_create_blend_mode_property().
+ * It adds a blend mode for alpha blending equation selection, describing
+ * how the pixels from the current plane are composited with the
+ * background.
+ *
+ * Three alpha blending equations are defined:
+ *
+ * "None":
+ * Blend formula that ignores the pixel alpha::
+ *
+ * out.rgb = plane_alpha * fg.rgb +
+ * (1 - plane_alpha) * bg.rgb
+ *
+ * "Pre-multiplied":
+ * Blend formula that assumes the pixel color values
+ * have been already pre-multiplied with the alpha
+ * channel values::
+ *
+ * out.rgb = plane_alpha * fg.rgb +
+ * (1 - (plane_alpha * fg.alpha)) * bg.rgb
+ *
+ * "Coverage":
+ * Blend formula that assumes the pixel color values have not
+ * been pre-multiplied and will do so when blending them to the
+ * background color values::
+ *
+ * out.rgb = plane_alpha * fg.alpha * fg.rgb +
+ * (1 - (plane_alpha * fg.alpha)) * bg.rgb
+ *
+ * Using the following symbols:
+ *
+ * "fg.rgb":
+ * Each of the RGB component values from the plane's pixel
+ * "fg.alpha":
+ * Alpha component value from the plane's pixel. If the plane's
+ * pixel format has no alpha component, then this is assumed to be
+ * 1.0. In these cases, this property has no effect, as all three
+ * equations become equivalent.
+ * "bg.rgb":
+ * Each of the RGB component values from the background
+ * "plane_alpha":
+ * Plane alpha value set by the plane "alpha" property. If the
+ * plane does not expose the "alpha" property, then this is
+ * assumed to be 1.0
+ *
* Note that all the property extensions described here apply either to the
* plane or the CRTC (e.g. for the background color, which currently is not
* exposed and assumed to be black).
@@ -448,3 +519,80 @@
return 0;
}
EXPORT_SYMBOL(drm_atomic_normalize_zpos);
+
+/**
+ * drm_plane_create_blend_mode_property - create a new blend mode property
+ * @plane: drm plane
+ * @supported_modes: bitmask of supported modes, must include
+ * BIT(DRM_MODE_BLEND_PREMULTI). Current DRM assumption is
+ * that alpha is premultiplied, and old userspace can break if
+ * the property defaults to anything else.
+ *
+ * This creates a new property describing the blend mode.
+ *
+ * The property exposed to userspace is an enumeration property (see
+ * drm_property_create_enum()) called "pixel blend mode" and has the
+ * following enumeration values:
+ *
+ * "None":
+ * Blend formula that ignores the pixel alpha.
+ *
+ * "Pre-multiplied":
+ * Blend formula that assumes the pixel color values have been already
+ * pre-multiplied with the alpha channel values.
+ *
+ * "Coverage":
+ * Blend formula that assumes the pixel color values have not been
+ * pre-multiplied and will do so when blending them to the background color
+ * values.
+ *
+ * RETURNS:
+ * Zero for success or -errno
+ */
+int drm_plane_create_blend_mode_property(struct drm_plane *plane,
+ unsigned int supported_modes)
+{
+ struct drm_device *dev = plane->dev;
+ struct drm_property *prop;
+ static const struct drm_prop_enum_list props[] = {
+ { DRM_MODE_BLEND_PIXEL_NONE, "None" },
+ { DRM_MODE_BLEND_PREMULTI, "Pre-multiplied" },
+ { DRM_MODE_BLEND_COVERAGE, "Coverage" },
+ };
+ unsigned int valid_mode_mask = BIT(DRM_MODE_BLEND_PIXEL_NONE) |
+ BIT(DRM_MODE_BLEND_PREMULTI) |
+ BIT(DRM_MODE_BLEND_COVERAGE);
+ int i;
+
+ if (WARN_ON((supported_modes & ~valid_mode_mask) ||
+ ((supported_modes & BIT(DRM_MODE_BLEND_PREMULTI)) == 0)))
+ return -EINVAL;
+
+ prop = drm_property_create(dev, DRM_MODE_PROP_ENUM,
+ "pixel blend mode",
+ hweight32(supported_modes));
+ if (!prop)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(props); i++) {
+ int ret;
+
+ if (!(BIT(props[i].type) & supported_modes))
+ continue;
+
+ ret = drm_property_add_enum(prop, props[i].type,
+ props[i].name);
+
+ if (ret) {
+ drm_property_destroy(dev, prop);
+
+ return ret;
+ }
+ }
+
+ drm_object_attach_property(&plane->base, prop, DRM_MODE_BLEND_PREMULTI);
+ plane->blend_mode_property = prop;
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_plane_create_blend_mode_property);