Hi all,
this is the first round of patches to enable the Prefetch Resolve Gasket and the Prefetch Resolve Engine as found on the i.MX6 QuadPlus. Basically those units are external extensions to the IPUv3 that are able to prefetch display data from DRAM to an internal SRAM region, transforming the periodic realtime requests from the display FIFOs into larger bursts of normal memory requests, which do mix better with other DRAM traffic in the system.
The PRE can do a number of transformations on the fly, like changing component and plane ordering, as well resolving the Vivante GPU tiling format into linear scanlines. None of those transformations are used right now.
This initial patchset uses the PRG/PRE units as linear prefetchers only. It does however hook up most of the interactions between imx-drm, IPUv3 and PRG/PRE, so that adding those transformations should be an incremental change over that. Also the devicetree binding fully describe the devices, so that no further changes should be necessary.
Regards, Lucas
Lucas Stach (9): gpu: ipu-v3: remove AXI ID setting for IC channel gpu: ipu-v3: add DT binding for the Prefetch Resolve Engine gpu: ipu-v3: add driver for Prefetch Resolve Engine gpu: ipu-v3: add DT binding for the Prefetch Resolve Gasket gpu: ipu-v3: add driver for Prefetch Resolve Gasket gpu: ipu-v3: extend the IPUv3 DT binding for i.MX6 QuadPlus gpu: ipu-v3: hook up PRG unit drm/imx: enable/disable PRG on CRTC enable/disable drm/imx: use PRG/PRE when possible
.../bindings/display/imx/fsl-imx-drm.txt | 53 +++ drivers/gpu/drm/imx/imx-drm-core.c | 5 + drivers/gpu/drm/imx/imx-drm.h | 3 + drivers/gpu/drm/imx/ipuv3-crtc.c | 2 + drivers/gpu/drm/imx/ipuv3-plane.c | 122 +++++- drivers/gpu/ipu-v3/Makefile | 2 +- drivers/gpu/ipu-v3/ipu-common.c | 7 + drivers/gpu/ipu-v3/ipu-image-convert.c | 2 - drivers/gpu/ipu-v3/ipu-pre.c | 290 +++++++++++++++ drivers/gpu/ipu-v3/ipu-prg.c | 413 +++++++++++++++++++++ drivers/gpu/ipu-v3/ipu-prv.h | 15 + include/video/imx-ipu-v3.h | 15 + 12 files changed, 923 insertions(+), 6 deletions(-) create mode 100644 drivers/gpu/ipu-v3/ipu-pre.c create mode 100644 drivers/gpu/ipu-v3/ipu-prg.c