37 	/* alpha at the lowest z position is not always supported */
281 	val = SUN4I_BACKEND_ATTCTL_REG0_LAY_GLBALPHA(state->alpha >> 8);  in sun4i_backend_update_layer_formats()
282 	if (state->alpha != DRM_BLEND_ALPHA_OPAQUE)  in sun4i_backend_update_layer_formats()
443 	 * support for an alpha component (which the frontend doesn't support).  in sun4i_backend_plane_uses_frontend()
531 		if (fb->format->has_alpha || (plane_state->alpha != DRM_BLEND_ALPHA_OPAQUE))  in sun4i_backend_atomic_check()
558 	 * The second step is the actual alpha blending, that takes  in sun4i_backend_atomic_check()
559 	 * the two pipes as input, and uses the potential alpha  in sun4i_backend_atomic_check()
563 	 * robust alpha blending between the 4 layers in all  in sun4i_backend_atomic_check()
565 	 * with alpha at the lowest position of our two pipes.  in sun4i_backend_atomic_check()
569 	 * pipe (pipe 0, priority 0), if it has any alpha, will  in sun4i_backend_atomic_check()
574 	 * have only three valid configurations with alpha, all of  in sun4i_backend_atomic_check()
575 	 * them with the alpha being on pipe1 with the lowest  in sun4i_backend_atomic_check()
585 		DRM_DEBUG_DRIVER("Too many planes with alpha, rejecting...\n");  in sun4i_backend_atomic_check()
589 	/* We can't have an alpha plane at the lowest position */  in sun4i_backend_atomic_check()
591 	    (plane_states[0]->alpha != DRM_BLEND_ALPHA_OPAQUE))  in sun4i_backend_atomic_check()
600 		 * The only alpha position is the lowest plane of the  in sun4i_backend_atomic_check()
603 		if (fb->format->has_alpha || (p_state->alpha != DRM_BLEND_ALPHA_OPAQUE))  in sun4i_backend_atomic_check()
620 	DRM_DEBUG_DRIVER("State valid with %u planes, %u alpha, %u video, %u YUV\n",  in sun4i_backend_atomic_check()