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It is permitted for a plane to be configured such that none of it is on-screen via either negative dest rectangle X,Y offset, or an offset that is greater than the crtc dimensions. These planes were resized via drm_atomic_helper_check_plane_state such that the source rectangle had a zero width or height, but they still created a dlist entry even though they contributed no pixels. In the case of vc6_plane_mode_set, that it could result in negative values being written into registers, which caused incorrect behaviour. Drop planes that result in a source width or height of 0 pixels or an on-screen size of 0 pixels to avoid the incorrect rendering. Reviewed-by: Maxime Ripard <mripard@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20241025-drm-vc4-2712-support-v2-28-35efa83c8fc0@raspberrypi.com Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>