Hello, this series add support for the Color Management Module (CMM) found on the R-Car Display Unit output channels. CMM is present in most of the Gen3 SoCs (V3-H and V3-M excluded) and in Gen2 (which is not supported by the series).
The CMM allows setting 1-D and 3-D gamma tables and generates histograms on images before they are directed to the DU's output pads.
The current implementation only supports configuration of the 1-D gamma table, by using the GAMMA_LUT KMS property. On top of this current version, more advanced features such as 3-D LUT support and histogram generation can be later implemented.
The series starts by adding the bindings definitions and by registering the clock providers for the various SoCs that support the CMM. It then registers CMMs in the SoC device tree sources and finally adds a driver for the CMM itself and integrates it in the rcar-du driver infrastructure to register, enable and update the CMM units.
Tested on M3-W Salvator-x on HDMI connector and on E3 Ebisu on VGA connector by injecting a 'color inversion' gamma table using a patched version of the KMS++ kmstest utility[1], and observing the CMM applies the correction matrix properly.
Series based on Laurent's drm/du/next branch at git://linuxtv.org/pinchartl/media.git
Thanks j
[1] https://github.com/tomba/kmsxx/
Jacopo Mondi (20): dt-bindings: display: renesas,cmm: Add R-Car CMM documentation dt-bindings: display, renesas,du: Document cmms property dt-bindings: display, renesas,du: Update 'vsps' in example clk: renesas: r8a7796: Add CMM clocks clk: renesas: r8a7795: Add CMM clocks clk: renesas: r8a77965: Add CMM clocks clk: renesas: r8a77990: Add CMM clocks clk: renesas: r8a77995: Add CMM clocks arm64: dts: renesas: r8a7796: Add CMM units arm64: dts: renesas: r8a7795: Add CMM units arm64: dts: renesas: r8a77965: Add CMM units arm64: dts: renesas: r8a77990: Add CMM units arm64: dts: renesas: r8a77995: Add CMM units drm: rcar-du: Add support for CMM drm: rcar-du: Claim CMM support for Gen3 SoCs drm: rcar-du: kms: Collect CMM instances drm: rcar-du: crtc: Enable and disable CMMs drm: rcar-du: group: Enable DU's CMM extension drm: rcar-du: crtc: Register GAMMA_LUT properties drm: rcar-du: kms: Update CMM in atomic commit tail
.../bindings/display/renesas,cmm.txt | 25 +++ .../bindings/display/renesas,du.txt | 7 +- arch/arm64/boot/dts/renesas/r8a7795.dtsi | 36 +++- arch/arm64/boot/dts/renesas/r8a7796.dtsi | 25 +++ arch/arm64/boot/dts/renesas/r8a77965.dtsi | 25 +++ arch/arm64/boot/dts/renesas/r8a77990.dtsi | 20 +- arch/arm64/boot/dts/renesas/r8a77995.dtsi | 20 +- drivers/clk/renesas/r8a7795-cpg-mssr.c | 4 + drivers/clk/renesas/r8a7796-cpg-mssr.c | 3 + drivers/clk/renesas/r8a77965-cpg-mssr.c | 3 + drivers/clk/renesas/r8a77990-cpg-mssr.c | 2 + drivers/clk/renesas/r8a77995-cpg-mssr.c | 2 + drivers/gpu/drm/rcar-du/Kconfig | 7 + drivers/gpu/drm/rcar-du/Makefile | 1 + drivers/gpu/drm/rcar-du/rcar_cmm.c | 197 ++++++++++++++++++ drivers/gpu/drm/rcar-du/rcar_cmm.h | 38 ++++ drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 18 ++ drivers/gpu/drm/rcar-du/rcar_du_crtc.h | 2 + drivers/gpu/drm/rcar-du/rcar_du_drv.c | 12 +- drivers/gpu/drm/rcar-du/rcar_du_drv.h | 4 + drivers/gpu/drm/rcar-du/rcar_du_group.c | 8 + drivers/gpu/drm/rcar-du/rcar_du_group.h | 2 + drivers/gpu/drm/rcar-du/rcar_du_kms.c | 86 ++++++++ drivers/gpu/drm/rcar-du/rcar_du_regs.h | 5 + 24 files changed, 544 insertions(+), 8 deletions(-) create mode 100644 Documentation/devicetree/bindings/display/renesas,cmm.txt create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.c create mode 100644 drivers/gpu/drm/rcar-du/rcar_cmm.h
-- 2.21.0