On 24/03/2020 15:20, Neil Armstrong wrote: > 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 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 (7): > 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/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(-) > Please ignore this serie, v4 has been sent. Neil _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
