drm/rcar-du: dsi: Implement DSI command TX using AXI memory access

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Currently, the driver supports register access mode for DSI command
transfer, which limits both TX and RX to only 16 Bytes long packets.
Implement support for DSI command TX using AXI memory access mode,
which extends the packet transfer length up to 128 Bytes long in LP
and 1024 Bytes long in HS. Support for DSI command RX using the AXI
access mode is not implemented due to missing test hardware.

The implementation allocates a DMAble 4k page. In case the command
transfer is longer than 16 Bytes, the payload is copied into the
page and sent out using the AXI access mode, otherwise the register
access mode is used.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen+renesas@ideasonboard.com>
Link: https://patch.msgid.link/20260910182003.31612-1-marek.vasut+renesas@mailbox.org
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

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Marek Vasut 2026-09-10 20:19:45 +02:00 • committed by Tomi Valkeinen

parent 6cafbb6cf0

commit 82f770ecf8

1 changed files with 42 additions and 8 deletions

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drivers/gpu/drm/renesas/rcar-du/rcar_mipi_dsi.c

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