Hi,
this series adds support for more alpha transpancy formats such as RGBA 8:8:8:8, ARGB 1:5:5:5, and the more esoteric formats with 8-bit alpha on a separate plane.
For the latter, new 2-plane RGB formats are added: DRM_FORMAT_XRGB8888_A8 DRM_FORMAT_XBGR8888_A8 DRM_FORMAT_RGBX8888_A8 DRM_FORMAT_BGRX8888_A8 DRM_FORMAT_RGB888_A8 DRM_FORMAT_BGR888_A8 DRM_FORMAT_RGB565_A8 DRM_FORMAT_BGR565_A8
They contain RGB data in the first plane and 8-bit alpha values in the second plane. If supported by the hardware, memory bandwidth usage can be reduced in case of frame buffers with large, completely transparent regions by selectively skipping read accesses in the color channel.
regards Philipp
Philipp Zabel (7): gpu: ipu-v3: Add support for 15-bit RGB with 1-bit alpha formats drm/imx: Add support for 15-bit RGB with 1-bit alpha formats gpu: ipu-v3: add support for RGBX8888 and RGBA8888 pixel formats gpu: ipu-v3: add support for separate alpha channels drm/imx: ipuv3-plane: enable support for RGBX8888 and RGBA8888 pixel formats drm: add RGB formats with separate alpha plane drm/imx: ipuv3-plane: add support for separate alpha planes
drivers/gpu/drm/drm_crtc.c | 35 ++++++++++ drivers/gpu/drm/imx/ipuv3-plane.c | 86 ++++++++++++++++++++++++ drivers/gpu/drm/imx/ipuv3-plane.h | 2 + drivers/gpu/ipu-v3/ipu-common.c | 10 +++ drivers/gpu/ipu-v3/ipu-cpmem.c | 133 ++++++++++++++++++++++++++++++++++++-- include/uapi/drm/drm_fourcc.h | 14 ++++ include/video/imx-ipu-v3.h | 22 +++++++ 7 files changed, 298 insertions(+), 4 deletions(-)