drm/komeda: Attach komeda_dev to DRM-KMS

Add komeda_kms abstracton to attach komeda_dev to DRM-KMS
  CRTC: according to the komeda_pipeline
  PLANE: according to komeda_layer (layer input pipeline)
  PRIVATE_OBJS: komeda_pipeline/component all will be treat as private_objs

komeda_kms is for connecting DRM-KMS and komeda_dev, like reporting the
kms object properties according to the komeda_dev, and pass/convert KMS's
requirement to komeda_dev.

Changes in v4:
- Set drm_atomic_helper_check as mode_config->atomic_check.

Changes in v3:
- Fixed style problem found by checkpatch.pl --strict.

Changes in v2:
- Unified abbreviation of "pipeline" to "pipe".

Signed-off-by: James Qian Wang (Arm Technology China) <james.qian.wang@arm.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>

1 files changed, 109 insertions, 0 deletions

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_plane.c b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
new file mode 100644
index 000000000000..0a4953a9a909
--- /dev/null
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_plane.c
@@ -0,0 +1,109 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
+#include "komeda_dev.h"
+#include "komeda_kms.h"
+
+static const struct drm_plane_helper_funcs komeda_plane_helper_funcs = {
+};
+
+static void komeda_plane_destroy(struct drm_plane *plane)
+{
+	drm_plane_cleanup(plane);
+
+	kfree(to_kplane(plane));
+}
+
+static const struct drm_plane_funcs komeda_plane_funcs = {
+};
+
+/* for komeda, which is pipeline can be share between crtcs */
+static u32 get_possible_crtcs(struct komeda_kms_dev *kms,
+			      struct komeda_pipeline *pipe)
+{
+	struct komeda_crtc *crtc;
+	u32 possible_crtcs = 0;
+	int i;
+
+	for (i = 0; i < kms->n_crtcs; i++) {
+		crtc = &kms->crtcs[i];
+
+		if ((pipe == crtc->master) || (pipe == crtc->slave))
+			possible_crtcs |= BIT(i);
+	}
+
+	return possible_crtcs;
+}
+
+/* use Layer0 as primary */
+static u32 get_plane_type(struct komeda_kms_dev *kms,
+			  struct komeda_component *c)
+{
+	bool is_primary = (c->id == KOMEDA_COMPONENT_LAYER0);
+
+	return is_primary ? DRM_PLANE_TYPE_PRIMARY : DRM_PLANE_TYPE_OVERLAY;
+}
+
+static int komeda_plane_add(struct komeda_kms_dev *kms,
+			    struct komeda_layer *layer)
+{
+	struct komeda_dev *mdev = kms->base.dev_private;
+	struct komeda_component *c = &layer->base;
+	struct komeda_plane *kplane;
+	struct drm_plane *plane;
+	u32 *formats, n_formats = 0;
+	int err;
+
+	kplane = kzalloc(sizeof(*kplane), GFP_KERNEL);
+	if (!kplane)
+		return -ENOMEM;
+
+	plane = &kplane->base;
+	kplane->layer = layer;
+
+	formats = komeda_get_layer_fourcc_list(&mdev->fmt_tbl,
+					       layer->layer_type, &n_formats);
+
+	err = drm_universal_plane_init(&kms->base, plane,
+			get_possible_crtcs(kms, c->pipeline),
+			&komeda_plane_funcs,
+			formats, n_formats, NULL,
+			get_plane_type(kms, c),
+			"%s", c->name);
+
+	komeda_put_fourcc_list(formats);
+
+	if (err)
+		goto cleanup;
+
+	drm_plane_helper_add(plane, &komeda_plane_helper_funcs);
+
+	return 0;
+cleanup:
+	komeda_plane_destroy(plane);
+	return err;
+}
+
+int komeda_kms_add_planes(struct komeda_kms_dev *kms, struct komeda_dev *mdev)
+{
+	struct komeda_pipeline *pipe;
+	int i, j, err;
+
+	for (i = 0; i < mdev->n_pipelines; i++) {
+		pipe = mdev->pipelines[i];
+
+		for (j = 0; j < pipe->n_layers; j++) {
+			err = komeda_plane_add(kms, pipe->layers[j]);
+			if (err)
+				return err;
+		}
+	}
+
+	return 0;
+}