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Date:   Mon, 24 Dec 2018 12:32:13 +0000
From:   Liviu Dudau <Liviu.Dudau@arm.com>
To:     "james qian wang (Arm Technology China)" <james.qian.wang@arm.com>
Cc:     "Jonathan Chai (Arm Technology China)" <Jonathan.Chai@arm.com>,
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Subject: Re: [PATCH v3 7/9] drm/komeda: Attach komeda_dev to DRM-KMS
Message-ID: <20181224123213.GI22341@e110455-lin.cambridge.arm.com>
References: <20181221095757.15510-1-james.qian.wang@arm.com>
 <20181221095757.15510-8-james.qian.wang@arm.com>
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On Fri, Dec 21, 2018 at 10:00:33AM +0000, james qian wang (Arm Technology China) wrote:
> 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 v3:
> - Fixed style problem found by checkpatch.pl --strict.
> 
> Changes in v2:
> - Unified abbreviation of "pipeline" to "pipe".
> 
> Signed-off-by: James (Qian) Wang <james.qian.wang@arm.com>
> ---
>  drivers/gpu/drm/arm/display/komeda/Makefile   |   6 +-
>  .../gpu/drm/arm/display/komeda/komeda_crtc.c  | 106 +++++++++++
>  .../gpu/drm/arm/display/komeda/komeda_drv.c   |  19 +-
>  .../gpu/drm/arm/display/komeda/komeda_kms.c   | 169 ++++++++++++++++++
>  .../gpu/drm/arm/display/komeda/komeda_kms.h   | 113 ++++++++++++
>  .../drm/arm/display/komeda/komeda_pipeline.h  |   3 +
>  .../gpu/drm/arm/display/komeda/komeda_plane.c | 109 +++++++++++
>  .../arm/display/komeda/komeda_private_obj.c   |  88 +++++++++
>  8 files changed, 608 insertions(+), 5 deletions(-)
>  create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
>  create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_kms.c
>  create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_kms.h
>  create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_plane.c
>  create mode 100644 drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
> 
> diff --git a/drivers/gpu/drm/arm/display/komeda/Makefile b/drivers/gpu/drm/arm/display/komeda/Makefile
> index 25beae900ed2..1b875e5dc0f6 100644
> --- a/drivers/gpu/drm/arm/display/komeda/Makefile
> +++ b/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
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> new file mode 100644
> index 000000000000..5bb5a55f6b31
> --- /dev/null
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_crtc.c
> @@ -0,0 +1,106 @@
> +// 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;
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
> index a2657b3d09d7..4b8ce717a71c 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_drv.c
> @@ -13,18 +13,21 @@
>  
>  struct komeda_drv {
>  	struct komeda_dev *mdev;
> +	struct komeda_kms_dev *kms;
>  };
>  
>  static void komeda_unbind(struct device *dev)
>  {
>  	struct komeda_drv *mdrv = dev_get_drvdata(dev);
>  
> -	dev_set_drvdata(dev, NULL);
> -

I would argue that you're fixing a bug here that was introduced in an
earlier patch, and that you should fix that patch rather than this
change.

>  	if (!mdrv)
>  		return;
>  
> +	komeda_kms_detach(mdrv->kms);
> +
>  	komeda_dev_destroy(mdrv->mdev);
> +
> +	dev_set_drvdata(dev, NULL);
>  	kfree(mdrv);
>  }
>  
> @@ -33,7 +36,7 @@ static int komeda_bind(struct device *dev)
>  	struct komeda_drv *mdrv;
>  	int err;
>  
> -	mdrv = kzalloc(sizeof(*mdrv), GFP_KERNEL);
> +	mdrv = devm_kzalloc(dev, sizeof(*mdrv), GFP_KERNEL);
>  	if (!mdrv)
>  		return -ENOMEM;
>  
> @@ -45,10 +48,18 @@ static int komeda_bind(struct device *dev)
>  
>  	dev_set_drvdata(dev, mdrv);
>  
> +	mdrv->kms = komeda_kms_attach(mdrv->mdev);
> +	if (IS_ERR(mdrv->kms)) {
> +		err = PTR_ERR(mdrv->kms);

does mdrv->kms needs to be set to NULL here?

> +		goto destroy_mdev;
> +	}
> +
>  	return 0;
>  
> +destroy_mdev:
> +	komeda_dev_destroy(mdrv->mdev);
>  free_mdrv:
> -	kfree(mdrv);
> +	devm_kfree(dev, mdrv);
>  	return err;
>  }
>  
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> new file mode 100644
> index 000000000000..fd48360ca524
> --- /dev/null
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
> @@ -0,0 +1,169 @@
> +// 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 Mali 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);

Mainline has also introduced the drm_atomic_helper_fake_vblank(old_state) call
to help with writebacks on CRTCs that might be otherwise disabled. Do we need
to have it here too?

> +
> +	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		= NULL,/*komeda_kms_check*/

I would argue that you should at least use drm_atomic_helper_check here,
rather than set it to NULL, even if later you will replace it with a
komeda function.

> +	.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 = true;
> +
> +	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);
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.h b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
> new file mode 100644
> index 000000000000..f13666004a42
> --- /dev/null
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.h
> @@ -0,0 +1,113 @@
> +/* 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_*/
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> index 2d68ffeae25d..114129d96851 100644
> --- a/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_pipeline.h
> @@ -333,6 +333,9 @@ 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,
> 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;
> +}
> diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c b/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
> new file mode 100644
> index 000000000000..9edfd6ab0c12
> --- /dev/null
> +++ b/drivers/gpu/drm/arm/display/komeda/komeda_private_obj.c
> @@ -0,0 +1,88 @@
> +// 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);
> +	}
> +}
> -- 
> 2.17.1
> 

Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>

Best regards,
Liviu


-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯