[PATCH v2 7/7] drm: rcar-du: Stop accessing non-existant registers on gen4

[Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx>]

The following registers do not exist on gen4, so we should not write
them: DEF6Rm, DEF7Rm, DEF8Rm, ESCRn, OTARn.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c  |  8 +++++---
 drivers/gpu/drm/rcar-du/rcar_du_group.c | 11 ++++++++---
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index b7dd59fe119e..008e172ed43b 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -298,10 +298,12 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
 		escr = params.escr;
 	}
 
-	dev_dbg(rcrtc->dev->dev, "%s: ESCR 0x%08x\n", __func__, escr);
+	if (rcdu->info->gen < 4) {
+		dev_dbg(rcrtc->dev->dev, "%s: ESCR 0x%08x\n", __func__, escr);
 
-	rcar_du_crtc_write(rcrtc, rcrtc->index % 2 ? ESCR13 : ESCR02, escr);
-	rcar_du_crtc_write(rcrtc, rcrtc->index % 2 ? OTAR13 : OTAR02, 0);
+		rcar_du_crtc_write(rcrtc, rcrtc->index % 2 ? ESCR13 : ESCR02, escr);
+		rcar_du_crtc_write(rcrtc, rcrtc->index % 2 ? OTAR13 : OTAR02, 0);
+	}
 
 	/* Signal polarities */
 	dsmr = ((mode->flags & DRM_MODE_FLAG_PVSYNC) ? DSMR_VSL : 0)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_group.c b/drivers/gpu/drm/rcar-du/rcar_du_group.c
index 6da01760ede5..c2209d427bb7 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_group.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_group.c
@@ -148,7 +148,8 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
 	}
 	rcar_du_group_write(rgrp, DEFR5, DEFR5_CODE | DEFR5_DEFE5);
 
-	rcar_du_group_setup_pins(rgrp);
+	if (rcdu->info->gen < 4)
+		rcar_du_group_setup_pins(rgrp);
 
 	/*
 	 * TODO: Handle routing of the DU output to CMM dynamically, as we
@@ -160,7 +161,8 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
 	rcar_du_group_write(rgrp, DEFR7, defr7);
 
 	if (rcdu->info->gen >= 2) {
-		rcar_du_group_setup_defr8(rgrp);
+		if (rcdu->info->gen < 4)
+			rcar_du_group_setup_defr8(rgrp);
 		rcar_du_group_setup_didsr(rgrp);
 	}
 
@@ -192,10 +194,13 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
  */
 int rcar_du_group_get(struct rcar_du_group *rgrp)
 {
+	struct rcar_du_device *rcdu = rgrp->dev;
+
 	if (rgrp->use_count)
 		goto done;
 
-	rcar_du_group_setup(rgrp);
+	if (rcdu->info->gen < 4)
+		rcar_du_group_setup(rgrp);
 
 done:
 	rgrp->use_count++;
-- 
2.34.1