drm/bridge: ti-sn65dsi83: add test pattern generation support

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Generation of a test pattern output is a useful tool for panel bringup and
debugging, and very simple to support with this chip.

The value of REG_VID_CHA_ACTIVE_LINE_LENGTH_LOW needs to be divided by two
for the test pattern to work in dual LVDS mode. While not clearly stated in
the datasheet, this is needed according to the DSI Tuner [0] output. And
some dual-LVDS panels refuse to show any picture without this division by
two.

[0] https://www.ti.com/tool/DSI-TUNER

Reviewed-by: Louis Chauvet <louis.chauvet@boootlin.com>
Link: https://patch.msgid.link/20260416-ti-sn65dsi83-dual-lvds-fixes-and-test-pattern-v3-1-143886aebc6b@bootlin.com
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

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Luca Ceresoli 2026-04-16 15:59:55 +02:00

parent 528578941a

commit 55a412e3a7

1 changed files with 12 additions and 2 deletions

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drivers/gpu/drm/bridge/ti-sn65dsi83.c

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