Amlogic uses a proprietary lossless image compression protocol and format for their hardware video codec accelerators, either video decoders or video input encoders.
It considerably reduces memory bandwidth while writing and reading frames in memory.
The underlying storage is considered to be 3 components, 8bit or 10-bit per component, YCbCr 420, single plane : - DRM_FORMAT_YUV420_8BIT - DRM_FORMAT_YUV420_10BIT
This modifier will be notably added to DMA-BUF frames imported from the V4L2 Amlogic VDEC decoder.
At least two layout are supported : - Basic: composed of a body and a header - Scatter: the buffer is filled with a IOMMU scatter table referring to the encoder current memory layout. This mode if more efficient in terms of memory allocation but frames are not dumpable and only valid during until the buffer is freed and back in control of the encoder
At least two options are supported : - Memory saving: when the pixel bpp is 8b, the size of the superblock can be reduced, thus saving memory.
This serie adds the missing register, updated the FBC decoder registers content to be committed by the crtc code.
The Amlogic FBC has been tested with compressed content from the Amlogic HW VP9 decoder on S905X (GXL), S905D2 (G12A) and S905X3 (SM1) in 8bit (Scatter+Mem Saving on G12A/SM1, Mem Saving on GXL) and 10bit (Scatter on G12A/SM1, default on GXL).
It's expected to work as-is on GXM and G12B SoCs.
Changes since v3 at [3]: - added dropped fourcc patch for scatter - fixed build of last patch
Changes since v2 at [2]: - Added "BASIC" layout and moved the SCATTER mode as layout, making BASIC and SCATTER layout exclusives - Moved the Memory Saving at bit 8 for options fields - Split fourcc and overlay patch to introduce basic, mem saving and then scatter in separate patches - Added comment about "transferability" of the buffers
Changes since v1 at [1]: - s/VD1_AXI_SEL_AFB/VD1_AXI_SEL_AFBC/ into meson_registers.h
[1] https://patchwork.freedesktop.org/series/73722/#rev1 [2] https://patchwork.freedesktop.org/series/73722/#rev2
Neil Armstrong (8): drm/fourcc: Add modifier definitions for describing Amlogic Video Framebuffer Compression drm/meson: add Amlogic Video FBC registers drm/meson: overlay: setup overlay for Amlogic FBC drm/meson: crtc: handle commit of Amlogic FBC frames drm/fourcc: amlogic: Add modifier definitions for Memory Saving option drm/meson: overlay: setup overlay for Amlogic FBC Memory Saving mode drm/fourcc: amlogic: Add modifier definitions for the Scatter layout drm/meson: overlay: setup overlay for Amlogic FBC Scatter Memory layout
drivers/gpu/drm/meson/meson_crtc.c | 118 ++++++++--- drivers/gpu/drm/meson/meson_drv.h | 16 ++ drivers/gpu/drm/meson/meson_overlay.c | 257 +++++++++++++++++++++++- drivers/gpu/drm/meson/meson_registers.h | 22 ++ include/uapi/drm/drm_fourcc.h | 66 ++++++ 5 files changed, 441 insertions(+), 38 deletions(-)