Some DSI pipelines have DSC (Display Stream Compression) IP block between the DU and the DSI. Even if DSC is not needed, the IP must be enabled for the DSI output to work.
This series adds a basic DSC driver, so that the DSC IP gets enabled in bypass mode. This enables DisplayPort output on Sparrow Hawk board, as the DP output comes from DSI and sn65dsi86 bridge, and also White Hawk board's second mini-DP output. Original series from Marek. Note: I see that not every run of kms++'s kmstest gives me a picture on my monitor. Sometimes the monitor seems to be trying to repeatedly sync, but fails, and the screen stays black. However, I see this same issue on WhiteHawk, which uses DSI0 pipeline, without DSC, so I think that is a separate issue. Tomi Signed-off-by: Tomi Valkeinen <[email protected]> --- Changes in v3: - Simplify DSC driver: drop reset control, drop clk handling, use runtime PM - Split dts changes for r8a779g0 and sparrow-hawk to separate patches - Add "arm64: dts: renesas: white-hawk: Add second mini-DP output support" - Link to v2: https://patch.msgid.link/[email protected] Changes in v2: - Fixed the dts example in "dt-bindings: display: bridge: Document Renesas R-Car V4H DSC bindings" - Link to v1: https://lore.kernel.org/r/[email protected] --- Geert Uytterhoeven (1): arm64: dts: renesas: white-hawk: Add second mini-DP output support Marek Vasut (5): clk: renesas: r8a779g0: Add DSC clock dt-bindings: display: bridge: Document Renesas R-Car V4H DSC bindings drm/rcar-du: dsc: Add rudimentary Renesas R-Car V4H DSC driver arm64: dts: renesas: r8a779g0: Add DSC arm64: dts: renesas: sparrow-hawk: Enable DisplayPort by adding DSC Tomi Valkeinen (1): drm/rcar-du: dsi: Support DSC in the pipeline .../bindings/display/bridge/renesas,dsc.yaml | 96 +++++++++++++ .../arm64/boot/dts/renesas/r8a779g0-white-hawk.dts | 94 ++++++++++++ arch/arm64/boot/dts/renesas/r8a779g0.dtsi | 31 +++- .../boot/dts/renesas/r8a779g3-sparrow-hawk.dts | 5 + drivers/clk/renesas/r8a779g0-cpg-mssr.c | 1 + drivers/gpu/drm/renesas/rcar-du/Kconfig | 12 ++ drivers/gpu/drm/renesas/rcar-du/Makefile | 1 + drivers/gpu/drm/renesas/rcar-du/rcar_dsc.c | 160 +++++++++++++++++++++ drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c | 36 ++++- 9 files changed, 433 insertions(+), 3 deletions(-) --- base-commit: 028ef9c96e96197026887c0f092424679298aae8 change-id: 20260514-rcar-du-dsc-45bcf0c2fe86 Best regards, -- Tomi Valkeinen <[email protected]>
