[media] v4l: vsp1: Document calling context of vsp1_pipeline_propagate_alpha()
The function can only be called from a s_stream handler as it requires a valid display list context (due to calling vsp1_uds_set_alpha() which writes to module registers). Document the requirement. Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
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@ -318,6 +318,9 @@ done:
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* to be scaled, we disable alpha scaling when the UDS input has a fixed alpha
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* value. The UDS then outputs a fixed alpha value which needs to be programmed
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* from the input RPF alpha.
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*
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* This function can only be called from a subdev s_stream handler as it
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* requires a valid display list context.
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*/
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void vsp1_pipeline_propagate_alpha(struct vsp1_pipeline *pipe,
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struct vsp1_entity *input,
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