drm/sun4i: tcon-top: Keep mixer routes distinct

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Both mixer selectors reset to TCON 0. Selecting the same TCON for both
mixers causes black or corrupted output.

When a route would collide, park the other mixer on another described
TCON, or an unused selector if none exists.

Since the TCON index is now used as a shift, also reject negative
values.

Tested on Orange Pi 3 with TCON_LCD0 and TCON_TV0.

Link: https://lore.kernel.org/linux-sunxi/Zn8GVkpwXwhaUFno@titan/
Link: https://lore.kernel.org/linux-sunxi/20241108-tcon_fix-v1-1-616218cc0d5f@jookia.org/
Fixes: 05db311a79 ("drm/sun4i: tcon-top: Add helpers for mux switching")
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Reviewed-by: Chen-Yu Tsai <wens@kernel.org>
Link: https://patch.msgid.link/52eb247169b268054302afa71e598add0b04748d.1785772659.git.jernej.skrabec@gmail.com
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>

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Jernej Skrabec 2026-08-03 18:10:42 +02:00 • committed by Chen-Yu Tsai

parent 583d99165a

commit 62bac32020

2 changed files with 65 additions and 12 deletions

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71

drivers/gpu/drm/sun4i/sun8i_tcon_top.c

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6

drivers/gpu/drm/sun4i/sun8i_tcon_top.h

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