a8xx_aperture_acquire
a8xx_aperture_acquire(gpu, PIPE_BR, &flags);
a8xx_aperture_acquire(gpu, PIPE_BV, &flags);
a8xx_aperture_acquire(gpu, pipe_id, &flags);
a8xx_aperture_acquire(gpu, PIPE_NONE, &flags);
a8xx_aperture_acquire(gpu, pipe, &flags);
a8xx_aperture_acquire(gpu, pipe_id, &flags);