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>

drivers/gpu/drm/arm/display/komeda/Makefile

@@ -9,7 +9,11 @@ komeda-y := \
 	komeda_dev.o \
 	komeda_format_caps.o \
 	komeda_pipeline.o \
-	komeda_framebuffer.o
+	komeda_framebuffer.o \
+	komeda_kms.o \
+	komeda_crtc.o \
+	komeda_plane.o \
+	komeda_private_obj.o
 
 komeda-y += \
 	d71/d71_dev.o

drivers/gpu/drm/arm/display/komeda/komeda_crtc.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <linux/pm_runtime.h>
+#include "komeda_dev.h"
+#include "komeda_kms.h"
+
+struct drm_crtc_helper_funcs komeda_crtc_helper_funcs = {
+};
+
+static const struct drm_crtc_funcs komeda_crtc_funcs = {
+};
+
+int komeda_kms_setup_crtcs(struct komeda_kms_dev *kms,
+			   struct komeda_dev *mdev)
+{
+	struct komeda_crtc *crtc;
+	struct komeda_pipeline *master;
+	char str[16];
+	int i;
+
+	kms->n_crtcs = 0;
+
+	for (i = 0; i < mdev->n_pipelines; i++) {
+		crtc = &kms->crtcs[kms->n_crtcs];
+		master = mdev->pipelines[i];
+
+		crtc->master = master;
+		crtc->slave  = NULL;
+
+		if (crtc->slave)
+			sprintf(str, "pipe-%d", crtc->slave->id);
+		else
+			sprintf(str, "None");
+
+		DRM_INFO("crtc%d: master(pipe-%d) slave(%s) output: %s.\n",
+			 kms->n_crtcs, master->id, str,
+			 master->of_output_dev ?
+			 master->of_output_dev->full_name : "None");
+
+		kms->n_crtcs++;
+	}
+
+	return 0;
+}
+
+static struct drm_plane *
+get_crtc_primary(struct komeda_kms_dev *kms, struct komeda_crtc *crtc)
+{
+	struct komeda_plane *kplane;
+	struct drm_plane *plane;
+
+	drm_for_each_plane(plane, &kms->base) {
+		if (plane->type != DRM_PLANE_TYPE_PRIMARY)
+			continue;
+
+		kplane = to_kplane(plane);
+		/* only master can be primary */
+		if (kplane->layer->base.pipeline == crtc->master)
+			return plane;
+	}
+
+	return NULL;
+}
+
+static int komeda_crtc_add(struct komeda_kms_dev *kms,
+			   struct komeda_crtc *kcrtc)
+{
+	struct drm_crtc *crtc = &kcrtc->base;
+	int err;
+
+	err = drm_crtc_init_with_planes(&kms->base, crtc,
+					get_crtc_primary(kms, kcrtc), NULL,
+					&komeda_crtc_funcs, NULL);
+	if (err)
+		return err;
+
+	drm_crtc_helper_add(crtc, &komeda_crtc_helper_funcs);
+	drm_crtc_vblank_reset(crtc);
+
+	crtc->port = kcrtc->master->of_output_port;
+
+	return 0;
+}
+
+int komeda_kms_add_crtcs(struct komeda_kms_dev *kms, struct komeda_dev *mdev)
+{
+	int i, err;
+
+	for (i = 0; i < kms->n_crtcs; i++) {
+		err = komeda_crtc_add(kms, &kms->crtcs[i]);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}

drivers/gpu/drm/arm/display/komeda/komeda_drv.c

@@ -10,9 +10,11 @@
 #include <linux/component.h>
 #include <drm/drm_of.h>
 #include "komeda_dev.h"
+#include "komeda_kms.h"
 
 struct komeda_drv {
 	struct komeda_dev *mdev;
+	struct komeda_kms_dev *kms;
 };
 
 static void komeda_unbind(struct device *dev)
@@ -22,6 +24,7 @@ static void komeda_unbind(struct device *dev)
 	if (!mdrv)
 		return;
 
+	komeda_kms_detach(mdrv->kms);
 	komeda_dev_destroy(mdrv->mdev);
 
 	dev_set_drvdata(dev, NULL);
@@ -43,10 +46,19 @@ static int komeda_bind(struct device *dev)
 		goto free_mdrv;
 	}
 
+	mdrv->kms = komeda_kms_attach(mdrv->mdev);
+	if (IS_ERR(mdrv->kms)) {
+		err = PTR_ERR(mdrv->kms);
+		goto destroy_mdev;
+	}
+
 	dev_set_drvdata(dev, mdrv);
 
 	return 0;
 
+destroy_mdev:
+	komeda_dev_destroy(mdrv->mdev);
+
 free_mdrv:
 	devm_kfree(dev, mdrv);
 	return err;

drivers/gpu/drm/arm/display/komeda/komeda_kms.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#include <linux/component.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <linux/interrupt.h>
+#include "komeda_dev.h"
+#include "komeda_kms.h"
+#include "komeda_framebuffer.h"
+
+DEFINE_DRM_GEM_CMA_FOPS(komeda_cma_fops);
+
+static int komeda_gem_cma_dumb_create(struct drm_file *file,
+				      struct drm_device *dev,
+				      struct drm_mode_create_dumb *args)
+{
+	u32 alignment = 16; /* TODO get alignment from dev */
+
+	args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8),
+			    alignment);
+
+	return drm_gem_cma_dumb_create_internal(file, dev, args);
+}
+
+static struct drm_driver komeda_kms_driver = {
+	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC |
+			   DRIVER_PRIME,
+	.lastclose			= drm_fb_helper_lastclose,
+	.gem_free_object_unlocked	= drm_gem_cma_free_object,
+	.gem_vm_ops			= &drm_gem_cma_vm_ops,
+	.dumb_create			= komeda_gem_cma_dumb_create,
+	.prime_handle_to_fd		= drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle		= drm_gem_prime_fd_to_handle,
+	.gem_prime_export		= drm_gem_prime_export,
+	.gem_prime_import		= drm_gem_prime_import,
+	.gem_prime_get_sg_table		= drm_gem_cma_prime_get_sg_table,
+	.gem_prime_import_sg_table	= drm_gem_cma_prime_import_sg_table,
+	.gem_prime_vmap			= drm_gem_cma_prime_vmap,
+	.gem_prime_vunmap		= drm_gem_cma_prime_vunmap,
+	.gem_prime_mmap			= drm_gem_cma_prime_mmap,
+	.fops = &komeda_cma_fops,
+	.name = "komeda",
+	.desc = "Arm Komeda Display Processor driver",
+	.date = "20181101",
+	.major = 0,
+	.minor = 1,
+};
+
+static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
+{
+	struct drm_device *dev = old_state->dev;
+
+	drm_atomic_helper_commit_modeset_disables(dev, old_state);
+
+	drm_atomic_helper_commit_planes(dev, old_state, 0);
+
+	drm_atomic_helper_commit_modeset_enables(dev, old_state);
+
+	drm_atomic_helper_wait_for_flip_done(dev, old_state);
+
+	drm_atomic_helper_commit_hw_done(old_state);
+
+	drm_atomic_helper_cleanup_planes(dev, old_state);
+}
+
+static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
+	.atomic_commit_tail = komeda_kms_commit_tail,
+};
+
+static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
+	.fb_create		= komeda_fb_create,
+	.atomic_check		= drm_atomic_helper_check,
+	.atomic_commit		= drm_atomic_helper_commit,
+};
+
+static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
+					struct komeda_dev *mdev)
+{
+	struct drm_mode_config *config = &kms->base.mode_config;
+
+	drm_mode_config_init(&kms->base);
+
+	komeda_kms_setup_crtcs(kms, mdev);
+
+	/* Get value from dev */
+	config->min_width	= 0;
+	config->min_height	= 0;
+	config->max_width	= 4096;
+	config->max_height	= 4096;
+	config->allow_fb_modifiers = false;
+
+	config->funcs = &komeda_mode_config_funcs;
+	config->helper_private = &komeda_mode_config_helpers;
+}
+
+struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
+{
+	struct komeda_kms_dev *kms = kzalloc(sizeof(*kms), GFP_KERNEL);
+	struct drm_device *drm;
+	int err;
+
+	if (!kms)
+		return ERR_PTR(-ENOMEM);
+
+	drm = &kms->base;
+	err = drm_dev_init(drm, &komeda_kms_driver, mdev->dev);
+	if (err)
+		goto free_kms;
+
+	drm->dev_private = mdev;
+
+	komeda_kms_mode_config_init(kms, mdev);
+
+	err = komeda_kms_add_private_objs(kms, mdev);
+	if (err)
+		goto cleanup_mode_config;
+
+	err = komeda_kms_add_planes(kms, mdev);
+	if (err)
+		goto cleanup_mode_config;
+
+	err = drm_vblank_init(drm, kms->n_crtcs);
+	if (err)
+		goto cleanup_mode_config;
+
+	err = komeda_kms_add_crtcs(kms, mdev);
+	if (err)
+		goto cleanup_mode_config;
+
+	err = component_bind_all(mdev->dev, kms);
+	if (err)
+		goto cleanup_mode_config;
+
+	drm_mode_config_reset(drm);
+
+	err = drm_dev_register(drm, 0);
+	if (err)
+		goto uninstall_irq;
+
+	return kms;
+
+uninstall_irq:
+	drm_irq_uninstall(drm);
+cleanup_mode_config:
+	drm_mode_config_cleanup(drm);
+free_kms:
+	kfree(kms);
+	return ERR_PTR(err);
+}
+
+void komeda_kms_detach(struct komeda_kms_dev *kms)
+{
+	struct drm_device *drm = &kms->base;
+	struct komeda_dev *mdev = drm->dev_private;
+
+	drm_dev_unregister(drm);
+	component_unbind_all(mdev->dev, drm);
+	komeda_kms_cleanup_private_objs(mdev);
+	drm_mode_config_cleanup(drm);
+	drm->dev_private = NULL;
+	drm_dev_put(drm);
+}

drivers/gpu/drm/arm/display/komeda/komeda_kms.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#ifndef _KOMEDA_KMS_H_
+#define _KOMEDA_KMS_H_
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_writeback.h>
+
+/** struct komeda_plane - komeda instance of drm_plane */
+struct komeda_plane {
+	/** @base: &drm_plane */
+	struct drm_plane base;
+	/**
+	 * @layer:
+	 *
+	 * represents available layer input pipelines for this plane.
+	 *
+	 * NOTE:
+	 * the layer is not for a specific Layer, but indicate a group of
+	 * Layers with same capabilities.
+	 */
+	struct komeda_layer *layer;
+};
+
+/**
+ * struct komeda_plane_state
+ *
+ * The plane_state can be split into two data flow (left/right) and handled
+ * by two layers &komeda_plane.layer and &komeda_plane.layer.right
+ */
+struct komeda_plane_state {
+	/** @base: &drm_plane_state */
+	struct drm_plane_state base;
+
+	/* private properties */
+};
+
+/**
+ * struct komeda_wb_connector
+ */
+struct komeda_wb_connector {
+	/** @base: &drm_writeback_connector */
+	struct drm_writeback_connector base;
+
+	/** @wb_layer: represents associated writeback pipeline of komeda */
+	struct komeda_layer *wb_layer;
+};
+
+/**
+ * struct komeda_crtc
+ */
+struct komeda_crtc {
+	/** @base: &drm_crtc */
+	struct drm_crtc base;
+	/** @master: only master has display output */
+	struct komeda_pipeline *master;
+	/**
+	 * @slave: optional
+	 *
+	 * Doesn't have its own display output, the handled data flow will
+	 * merge into the master.
+	 */
+	struct komeda_pipeline *slave;
+};
+
+/** struct komeda_crtc_state */
+struct komeda_crtc_state {
+	/** @base: &drm_crtc_state */
+	struct drm_crtc_state base;
+
+	/* private properties */
+
+	/* computed state which are used by validate/check */
+	u32 affected_pipes;
+	u32 active_pipes;
+};
+
+/** struct komeda_kms_dev - for gather KMS related things */
+struct komeda_kms_dev {
+	/** @base: &drm_device */
+	struct drm_device base;
+
+	/** @n_crtcs: valid numbers of crtcs in &komeda_kms_dev.crtcs */
+	int n_crtcs;
+	/** @crtcs: crtcs list */
+	struct komeda_crtc crtcs[KOMEDA_MAX_PIPELINES];
+};
+
+#define to_kplane(p)	container_of(p, struct komeda_plane, base)
+#define to_kplane_st(p)	container_of(p, struct komeda_plane_state, base)
+#define to_kconn(p)	container_of(p, struct komeda_wb_connector, base)
+#define to_kcrtc(p)	container_of(p, struct komeda_crtc, base)
+#define to_kcrtc_st(p)	container_of(p, struct komeda_crtc_state, base)
+#define to_kdev(p)	container_of(p, struct komeda_kms_dev, base)
+
+int komeda_kms_setup_crtcs(struct komeda_kms_dev *kms, struct komeda_dev *mdev);
+
+int komeda_kms_add_crtcs(struct komeda_kms_dev *kms, struct komeda_dev *mdev);
+int komeda_kms_add_planes(struct komeda_kms_dev *kms, struct komeda_dev *mdev);
+int komeda_kms_add_private_objs(struct komeda_kms_dev *kms,
+				struct komeda_dev *mdev);
+void komeda_kms_cleanup_private_objs(struct komeda_dev *mdev);
+
+struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev);
+void komeda_kms_detach(struct komeda_kms_dev *kms);
+
+#endif /*_KOMEDA_KMS_H_*/

drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h

@@ -331,6 +331,9 @@ struct komeda_pipeline_state {
 #define to_improc_st(c)	container_of(c, struct komeda_improc_state, base)
 #define to_ctrlr_st(c)	container_of(c, struct komeda_timing_ctrlr_state, base)
 
+#define priv_to_comp_st(o) container_of(o, struct komeda_component_state, obj)
+#define priv_to_pipe_st(o)  container_of(o, struct komeda_pipeline_state, obj)
+
 /* pipeline APIs */
 struct komeda_pipeline *
 komeda_pipeline_add(struct komeda_dev *mdev, size_t size,

drivers/gpu/drm/arm/display/komeda/komeda_plane.c

+// 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;
+}

drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
+ * Author: James.Qian.Wang <james.qian.wang@arm.com>
+ *
+ */
+#include "komeda_dev.h"
+#include "komeda_kms.h"
+
+static struct drm_private_state *
+komeda_pipeline_atomic_duplicate_state(struct drm_private_obj *obj)
+{
+	struct komeda_pipeline_state *st;
+
+	st = kmemdup(obj->state, sizeof(*st), GFP_KERNEL);
+	if (!st)
+		return NULL;
+
+	st->active_comps = 0;
+
+	__drm_atomic_helper_private_obj_duplicate_state(obj, &st->obj);
+
+	return &st->obj;
+}
+
+static void
+komeda_pipeline_atomic_destroy_state(struct drm_private_obj *obj,
+				     struct drm_private_state *state)
+{
+	kfree(priv_to_pipe_st(state));
+}
+
+static const struct drm_private_state_funcs komeda_pipeline_obj_funcs = {
+	.atomic_duplicate_state	= komeda_pipeline_atomic_duplicate_state,
+	.atomic_destroy_state	= komeda_pipeline_atomic_destroy_state,
+};
+
+static int komeda_pipeline_obj_add(struct komeda_kms_dev *kms,
+				   struct komeda_pipeline *pipe)
+{
+	struct komeda_pipeline_state *st;
+
+	st = kzalloc(sizeof(*st), GFP_KERNEL);
+	if (!st)
+		return -ENOMEM;
+
+	st->pipe = pipe;
+	drm_atomic_private_obj_init(&pipe->obj, &st->obj,
+				    &komeda_pipeline_obj_funcs);
+
+	return 0;
+}
+
+int komeda_kms_add_private_objs(struct komeda_kms_dev *kms,
+				struct komeda_dev *mdev)
+{
+	struct komeda_pipeline *pipe;
+	int i, err;
+
+	for (i = 0; i < mdev->n_pipelines; i++) {
+		pipe = mdev->pipelines[i];
+
+		err = komeda_pipeline_obj_add(kms, pipe);
+		if (err)
+			return err;
+
+		/* Add component */
+	}
+
+	return 0;
+}
+
+void komeda_kms_cleanup_private_objs(struct komeda_dev *mdev)
+{
+	struct komeda_pipeline *pipe;
+	struct komeda_component *c;
+	int i, id;
+
+	for (i = 0; i < mdev->n_pipelines; i++) {
+		pipe = mdev->pipelines[i];
+		dp_for_each_set_bit(id, pipe->avail_comps) {
+			c = komeda_pipeline_get_component(pipe, id);
+
+			drm_atomic_private_obj_fini(&c->obj);
+		}
+		drm_atomic_private_obj_fini(&pipe->obj);
+	}
+}