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.
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 <tomi.valkeinen+renesas@ideasonboard.com>
---
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/20260514-rcar-du-dsc-v1-0-d65f7a9e9841@ideasonboard.com
---
Marek Vasut (4):
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: Add Renesas R-Car V4H DSC
Tomi Valkeinen (1):
drm/rcar-du: dsi: Support DSC in the pipeline
.../bindings/display/bridge/renesas,dsc.yaml | 96 ++++++++++++
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 | 13 ++
drivers/gpu/drm/renesas/rcar-du/Makefile | 1 +
drivers/gpu/drm/renesas/rcar-du/rcar_dsc.c | 163 +++++++++++++++++++++
drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c | 36 ++++-
8 files changed, 343 insertions(+), 3 deletions(-)
---
base-commit: 028ef9c96e96197026887c0f092424679298aae8
change-id: 20260514-rcar-du-dsc-45bcf0c2fe86
Best regards,
--
Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>