[RFC 7/9] drm: rcar-du: group: Enable CMM unit

[Jacopo Mondi <jacopo+renesas@jmondi.org>]

Enable the CMM units present in the group through the display unit
extensional function control group register DEFR7.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
---
 drivers/gpu/drm/rcar-du/rcar_du_group.c | 8 ++++++++
 drivers/gpu/drm/rcar-du/rcar_du_regs.h  | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c
index 9eee47969e77..ce25e41b04bc 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_group.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c
@@ -147,6 +147,14 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
 
 	rcar_du_group_setup_pins(rgrp);
 
+	if (rgrp->cmms_mask) {
+		u32 defr7 = DEFR7_CODE;
+		defr7 |= rgrp->cmms_mask & BIT(1) ? DEFR7_CMME1 : 0;
+		defr7 |= rgrp->cmms_mask & BIT(0) ? DEFR7_CMME0 : 0;
+
+		rcar_du_group_write(rgrp, DEFR7, defr7);
+	}
+
 	if (rcdu->info->gen >= 2) {
 		rcar_du_group_setup_defr8(rgrp);
 		rcar_du_group_setup_didsr(rgrp);
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_regs.h b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
index bc87f080b170..fb9964949368 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_regs.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
@@ -197,6 +197,11 @@
 #define DEFR6_MLOS1		(1 << 2)
 #define DEFR6_DEFAULT		(DEFR6_CODE | DEFR6_TCNE1)
 
+#define DEFR7			0x000ec
+#define DEFR7_CODE		(0x7779 << 16)
+#define DEFR7_CMME1		BIT(6)
+#define DEFR7_CMME0		BIT(4)
+
 /* -----------------------------------------------------------------------------
  * R8A7790-only Control Registers
  */
-- 
2.21.0