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drm_hwcomposer: check if the plane is being used by any crtc

Merged Yongqin Liu requested to merge yongqin.liu/drm-hwcomposer:main into main

if the plane is used for other crtc, then that crtc is not supported by this plane. As it's protected by the plane_switching_crtc function in the kernel drivers/gpu/drm/drm_atomic.c file

Signed-off-by: Yongqin Liu yongqin.liu@linaro.org