drm: rcar-du: Compute plane DDCR4 register value directly

There's no need for a read-modify-write pattern, all register bits can
be set explicitly.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.c b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
index c3ed952..aa02c37 100644 (file)
--- a/drivers/gpu/drm/rcar-du/rcar_du_plane.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.c
@@ -28,13 +28,6 @@
 #define RCAR_DU_COLORKEY_SOURCE                (1 << 24)
 #define RCAR_DU_COLORKEY_MASK          (1 << 24)
 
-static u32 rcar_du_plane_read(struct rcar_du_group *rgrp,
-                             unsigned int index, u32 reg)
-{
-       return rcar_du_read(rgrp->dev,
-                           rgrp->mmio_offset + index * PLANE_OFF + reg);
-}
-
 static void rcar_du_plane_write(struct rcar_du_group *rgrp,
                                unsigned int index, u32 reg, u32 data)
 {
@@ -182,9 +175,6 @@ static void __rcar_du_plane_setup(struct rcar_du_plane *plane,
         * The data format is selected by the DDDF field in PnMR and the EDF
         * field in DDCR4.
         */
-       ddcr4 = rcar_du_plane_read(rgrp, index, PnDDCR4);
-       ddcr4 &= ~PnDDCR4_EDF_MASK;
-       ddcr4 |= state->format->edf | PnDDCR4_CODE;
 
        rcar_du_plane_setup_mode(plane, index);
 
@@ -204,6 +194,9 @@ static void __rcar_du_plane_setup(struct rcar_du_plane *plane,
        }
 
        rcar_du_plane_write(rgrp, index, PnDDCR2, ddcr2);
+
+       ddcr4 = state->format->edf | PnDDCR4_CODE;
+
        rcar_du_plane_write(rgrp, index, PnDDCR4, ddcr4);
 
        /* Destination position and size */