[PATCH v2 02/10] drm/rcar-du: Write DPTSR only if there are more than one crtc

[Tomi Valkeinen]

From: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx>

Currently the driver always writes DPTSR when setting up the hardware.
However, the register is only meaningful when there are more than one
crtc, and the only SoC with one crtc, V3M, does not have the register
mentioned in its documentation.

So move the write behind a condition.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/renesas/rcar-du/rcar_du_group.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_group.c b/drivers/gpu/drm/renesas/rcar-du/rcar_du_group.c
index 2ccd2581f544..0fbf6abbde6e 100644
--- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_group.c
+++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_group.c
@@ -185,11 +185,13 @@ static void rcar_du_group_setup(struct rcar_du_group *rgrp)
 		dorcr |= DORCR_PG1T | DORCR_DK1S | DORCR_PG1D_DS1;
 	rcar_du_group_write(rgrp, DORCR, dorcr);
 
-	/* Apply planes to CRTCs association. */
-	mutex_lock(&rgrp->lock);
-	rcar_du_group_write(rgrp, DPTSR, (rgrp->dptsr_planes << 16) |
-			    rgrp->dptsr_planes);
-	mutex_unlock(&rgrp->lock);
+	if (rgrp->num_crtcs > 1) {
+		/* Apply planes to CRTCs association. */
+		mutex_lock(&rgrp->lock);
+		rcar_du_group_write(rgrp, DPTSR, (rgrp->dptsr_planes << 16) |
+				    rgrp->dptsr_planes);
+		mutex_unlock(&rgrp->lock);
+	}
 }
 
 /*

-- 
2.43.0