drm/rcar-du: Introduce CRTCs groups

The R8A7779 DU is split in per-CRTC resources (scan-out engine, blending
unit, timings generator, ...) and device-global resources (start/stop
control, planes, ...) shared between the two CRTCs.

The R8A7790 introduced a third CRTC with its own set of global resources
This would be modeled as two separate DU device instances if it wasn't
for a handful or resources that are shared between the three CRTCs
(mostly related to input and output routing). For this reason the
R8A7790 DU must be modeled as a single device with three CRTCs, two sets
of "semi-global" resources, and a few device-global resources.

Introduce a new rcar_du_group driver-specific object, without any real
counterpart in the DU documentation, that models those semi-global
resources.

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

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/gpu/drm/rcar-du/rcar_du_kms.c b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
index a1343fb..c32e0f9 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_kms.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_kms.c
@@ -174,17 +174,20 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 	rcdu->ddev->mode_config.max_height = 2047;
 	rcdu->ddev->mode_config.funcs = &rcar_du_mode_config_funcs;
 
-	ret = rcar_du_planes_init(rcdu);
+	rcdu->group.dev = rcdu;
+	rcdu->group.index = 0;
+	rcdu->group.used_crtcs = 0;
+
+	ret = rcar_du_planes_init(&rcdu->group);
 	if (ret < 0)
 		return ret;
 
 	for (i = 0; i < ARRAY_SIZE(rcdu->crtcs); ++i) {
-		ret = rcar_du_crtc_create(rcdu, i);
+		ret = rcar_du_crtc_create(&rcdu->group, i);
 		if (ret < 0)
 			return ret;
 	}
 
-	rcdu->used_crtcs = 0;
 	rcdu->num_crtcs = i;
 
 	for (i = 0; i < rcdu->pdata->num_encoders; ++i) {
@@ -215,7 +218,7 @@ int rcar_du_modeset_init(struct rcar_du_device *rcdu)
 		encoder->possible_clones = 1 << 0;
 	}
 
-	ret = rcar_du_planes_register(rcdu);
+	ret = rcar_du_planes_register(&rcdu->group);
 	if (ret < 0)
 		return ret;