Merge tag 'du-fixes-20181126' of git://linuxtv.org/pinchartl/media into drm-fixes

static void __rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start)

{

	struct rcar_du_device *rcdu = rgrp->dev;

	/*

	 * Group start/stop is controlled by the DRES and DEN bits of DSYSR0

	 * for the first group and DSYSR2 for the second group. On most DU

	 * instances, this maps to the first CRTC of the group, and we can just

	 * use rcar_du_crtc_dsysr_clr_set() to access the correct DSYSR. On

	 * M3-N, however, DU2 doesn't exist, but DSYSR2 does. We thus need to

	 * access the register directly using group read/write.

	 */

	if (rcdu->info->channels_mask & BIT(rgrp->index * 2)) {

		struct rcar_du_crtc *rcrtc = &rgrp->dev->crtcs[rgrp->index * 2];

		rcar_du_crtc_dsysr_clr_set(rcrtc, DSYSR_DRES | DSYSR_DEN,

					   start ? DSYSR_DEN : DSYSR_DRES);

	} else {

		rcar_du_group_write(rgrp, DSYSR,

				    start ? DSYSR_DEN : DSYSR_DRES);

	}

}

void rcar_du_group_start_stop(struct rcar_du_group *rgrp, bool start)