[PATCH v4 0/2] drm/blend: Add per-plane pixel blend mode property

From: Lowry Li
Date: Wed Aug 15 2018 - 02:36:04 EST


This serie aims at adding the support for pixel blend modes represent the
alpha blending equation selection in the driver. It also introduces to use
it in the malidp driver.

Let me know what you think,

Changes for v4:
- Refines drm_plane_create_blend_mode_property(). drm_property_add_enum()
can calculate the index itself just fine, so no point in having the
caller pass it in.
- Since the current DRM assumption is that alpha is premultiplied as default,
define DRM_MODE_BLEND_PREMULTI as 0 will be better.
- Refines some comments.
- Updates on drm/malidp, hardware limitation check only when the format has
alpha pixel.
- Rebases on drm-misc-next and fixed the confilcts

Changes for v3:
- Refines the comments of drm_plane_create_blend_mode_property:
1) Puts the descriptions (after the ":") on a new line
2) Adds explaining why @supported_modes need PREMUL as default
- Refines the comments of drm/mali-dp patchset
- Rebased on drm-misc-next and fixed the confilcts with plane alpha patch

Changes for v2:
- Moves the blending equation into the DOC comment
- Refines the comments of drm_plane_create_blend_mode_property to not
enumerate the #defines, but instead the string values
- Uses fg.* instead of pixel.* and plane_alpha instead of plane.alpha
- Introduces to use it in the malidp driver, which depends on the plane
alpha patch

Changes from v1:
- v1 is just the core changes to request for commments
- Adds a pixel_blend_mode to drm_plane_state and a blend_mode_property to
drm_plane, and related support functions
- Defines three blend modes in drm_blend.h
- Rebased on current drm-next

Lowry Li (2):
drm: Add per-plane pixel blend mode property
drm/mali-dp: Implement plane alpha and pixel blend on malidp

drivers/gpu/drm/arm/malidp_planes.c | 74 ++++++++++++---------
drivers/gpu/drm/drm_atomic.c | 4 ++
drivers/gpu/drm/drm_atomic_helper.c | 1 +
drivers/gpu/drm/drm_blend.c | 126 ++++++++++++++++++++++++++++++++++++
include/drm/drm_blend.h | 6 ++
include/drm/drm_plane.h | 2 +
6 files changed, 182 insertions(+), 31 deletions(-)