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Subject: Re: [PATCH10 3/3] ARM:drm ivip Intel FPGA Video and Image Processing
 Suite
To:     "Hean-Loong, Ong" <hean.loong.ong@intel.com>,
        Rob Herring <robh+dt@kernel.org>,
        Dinh Nguyen <dinguyen@kernel.org>,
        David Airlie <airlied@linux.ie>
Cc:     devicetree@vger.kernel.org, yves.vandervennet@intel.com,
        chin.liang.see@intel.com, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org
References: <1534237029-2648-1-git-send-email-hean.loong.ong@intel.com>
 <1534237029-2648-4-git-send-email-hean.loong.ong@intel.com>
From:   =?UTF-8?Q?Noralf_Tr=c3=b8nnes?= <noralf@tronnes.org>
Message-ID: <28d5e08c-4ae2-2d09-6ce4-985578535d34@tronnes.org>
Date:   Wed, 15 Aug 2018 14:26:33 +0200
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Den 14.08.2018 10.57, skrev Hean-Loong, Ong:
> From: Ong Hean Loong <hean.loong.ong@intel.com>
>
> Driver for Intel FPGA Video and Image Processing Suite Frame Buffer II.
> The driver only supports the Intel Arria10 devkit and its variants.
> This driver can be either loaded staticlly or in modules.
> The OF device tree binding is located at:
> Documentation/devicetree/bindings/display/altr,vip-fb2.txt
>
> Signed-off-by: Ong Hean Loong <hean.loong.ong@intel.com>
> ---
>   drivers/gpu/drm/Kconfig               |    2 +
>   drivers/gpu/drm/Makefile              |    1 +
>   drivers/gpu/drm/ivip/Kconfig          |   14 +++
>   drivers/gpu/drm/ivip/Makefile         |    9 ++
>   drivers/gpu/drm/ivip/intel_vip_conn.c |   95 ++++++++++++++++
>   drivers/gpu/drm/ivip/intel_vip_core.c |  161 +++++++++++++++++++++++++++
>   drivers/gpu/drm/ivip/intel_vip_drv.h  |   52 +++++++++
>   drivers/gpu/drm/ivip/intel_vip_of.c   |  193 +++++++++++++++++++++++++++++++++
>   8 files changed, 527 insertions(+), 0 deletions(-)
>   create mode 100644 drivers/gpu/drm/ivip/Kconfig
>   create mode 100644 drivers/gpu/drm/ivip/Makefile
>   create mode 100644 drivers/gpu/drm/ivip/intel_vip_conn.c
>   create mode 100644 drivers/gpu/drm/ivip/intel_vip_core.c
>   create mode 100644 drivers/gpu/drm/ivip/intel_vip_drv.h
>   create mode 100644 drivers/gpu/drm/ivip/intel_vip_of.c
>
> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
> index cb88528..6b2845b 100644
> --- a/drivers/gpu/drm/Kconfig
> +++ b/drivers/gpu/drm/Kconfig
> @@ -215,6 +215,8 @@ source "drivers/gpu/drm/nouveau/Kconfig"
>   
>   source "drivers/gpu/drm/i915/Kconfig"
>   
> +source "drivers/gpu/drm/ivip/Kconfig"
> +
>   config DRM_VGEM
>   	tristate "Virtual GEM provider"
>   	depends on DRM
> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
> index a6771ce..57205d8 100644
> --- a/drivers/gpu/drm/Makefile
> +++ b/drivers/gpu/drm/Makefile
> @@ -61,6 +61,7 @@ obj-$(CONFIG_DRM_AMDGPU)+= amd/amdgpu/
>   obj-$(CONFIG_DRM_MGA)	+= mga/
>   obj-$(CONFIG_DRM_I810)	+= i810/
>   obj-$(CONFIG_DRM_I915)	+= i915/
> +obj-$(CONFIG_DRM_IVIP)	+= ivip/
>   obj-$(CONFIG_DRM_MGAG200) += mgag200/
>   obj-$(CONFIG_DRM_V3D)  += v3d/
>   obj-$(CONFIG_DRM_VC4)  += vc4/
> diff --git a/drivers/gpu/drm/ivip/Kconfig b/drivers/gpu/drm/ivip/Kconfig
> new file mode 100644
> index 0000000..1d08b90
> --- /dev/null
> +++ b/drivers/gpu/drm/ivip/Kconfig
> @@ -0,0 +1,14 @@
> +config DRM_IVIP
> +        tristate "Intel FGPA Video and Image Processing"
> +        depends on DRM && OF
> +        select DRM_GEM_CMA_HELPER
> +        select DRM_KMS_HELPER
> +        select DRM_KMS_FB_HELPER
> +        select DRM_KMS_CMA_HELPER
> +        help
> +		  Choose this option if you have an Intel FPGA Arria 10 system
> +		  and above with an Intel Display Port IP. This does not support
> +		  legacy Intel FPGA Cyclone V display port. Currently only single
> +		  frame buffer is supported. Note that ACPI and X_86 architecture
> +		  is not supported for Arria10. If M is selected the module will be
> +		  called ivip.
> diff --git a/drivers/gpu/drm/ivip/Makefile b/drivers/gpu/drm/ivip/Makefile
> new file mode 100644
> index 0000000..cc55b04
> --- /dev/null
> +++ b/drivers/gpu/drm/ivip/Makefile
> @@ -0,0 +1,9 @@
> +#
> +# Makefile for the drm device driver.  This driver provides support for the
> +# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
> +
> +ccflags-y := -Iinclude/drm

This shouldn't be necessary AFAIK.

> +
> +obj-$(CONFIG_DRM_IVIP) += ivip.o
> +ivip-objs := intel_vip_of.o intel_vip_core.o \
> +	intel_vip_conn.o
> diff --git a/drivers/gpu/drm/ivip/intel_vip_conn.c b/drivers/gpu/drm/ivip/intel_vip_conn.c
> new file mode 100644
> index 0000000..46bb04c
> --- /dev/null
> +++ b/drivers/gpu/drm/ivip/intel_vip_conn.c
> @@ -0,0 +1,95 @@

Please add an SPDX indentifier at the top of your files and you can drop
the license text.

Header files use this:
/* SPDX-License-Identifier: GPL-2.0 */

C-files uses c++ comment due to reasons:
// SPDX-License-Identifier: GPL-2.0

> +/*
> + * intel_vip_conn.c -- Intel Video and Image Processing(VIP)
> + * Frame Buffer II driver
> + *
> + * This driver supports the Intel VIP Frame Reader component.
> + * More info on the hardware can be found in the Intel Video
> + * and Image Processing Suite User Guide at this address
> + * http://www.altera.com/literature/ug/ug_vip.pdf.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * Authors:
> + * Ong, Hean-Loong <hean.loong.ong@intel.com>
> + *
> + */
> +
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_encoder_slave.h>
> +#include <drm/drm_plane_helper.h>
> +
> +static enum drm_connector_status
> +intelvipfb_drm_connector_detect(struct drm_connector *connector, bool force)
> +{
> +	return connector_status_connected;
> +}
> +
> +static void intelvipfb_drm_connector_destroy(struct drm_connector *connector)
> +{
> +	drm_connector_unregister(connector);
> +	drm_connector_cleanup(connector);
> +}
> +
> +static const struct drm_connector_funcs intelvipfb_drm_connector_funcs = {
> +	.reset = drm_atomic_helper_connector_reset,
> +	.detect = intelvipfb_drm_connector_detect,
> +	.fill_modes = drm_helper_probe_single_connector_modes,
> +	.destroy = intelvipfb_drm_connector_destroy,
> +	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +static int intelvipfb_drm_connector_get_modes(struct drm_connector *connector)
> +{
> +	struct drm_device *drm = connector->dev;
> +	int count;
> +
> +	count = drm_add_modes_noedid(connector, drm->mode_config.max_width,
> +				     drm->mode_config.max_height);
> +	drm_set_preferred_mode(connector, drm->mode_config.max_width,
> +			       drm->mode_config.max_height);
> +	return count;
> +}
> +
> +static const struct drm_connector_helper_funcs
> +intelvipfb_drm_connector_helper_funcs = {
> +	.get_modes = intelvipfb_drm_connector_get_modes,
> +};
> +
> +struct drm_connector *
> +intelvipfb_conn_setup(struct drm_device *drm)
> +{
> +	struct drm_connector *conn;
> +	int ret;
> +
> +	conn = devm_kzalloc(drm->dev, sizeof(*conn), GFP_KERNEL);
> +	if (IS_ERR(conn))
> +		return NULL;
> +
> +	ret = drm_connector_init(drm, conn, &intelvipfb_drm_connector_funcs,
> +				 DRM_MODE_CONNECTOR_DisplayPort);
> +	if (ret < 0) {
> +		dev_err(drm->dev, "failed to initialize drm connector\n");
> +		ret = -ENOMEM;
> +		goto error_connector_cleanup;
> +	}
> +
> +	conn->polled = 0;

No need to set this, it is already zero from the allocation.

> +	drm_connector_helper_add(conn, &intelvipfb_drm_connector_helper_funcs);
> +
> +	return conn;
> +
> +error_connector_cleanup:
> +	drm_connector_cleanup(conn);
> +
> +	return NULL;
> +}
> diff --git a/drivers/gpu/drm/ivip/intel_vip_core.c b/drivers/gpu/drm/ivip/intel_vip_core.c
> new file mode 100644
> index 0000000..b601bb4
> --- /dev/null
> +++ b/drivers/gpu/drm/ivip/intel_vip_core.c
> @@ -0,0 +1,160 @@
> +/*
> + * intel_vip_core.c -- Intel Video and Image Processing(VIP)
> + * Frame Buffer II driver
> + *
> + * This driver supports the Intel VIP Frame Reader component.
> + * More info on the hardware can be found in the Intel Video
> + * and Image Processing Suite User Guide at this address
> + * http://www.altera.com/literature/ug/ug_vip.pdf.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * Authors:
> + * Ong, Hean-Loong <hean.loong.ong@intel.com>
> + *
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_atomic.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_crtc_helper.h>
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_plane_helper.h>
> +#include <drm/drm_simple_kms_helper.h>
> +#include <drm/drm_gem_framebuffer_helper.h>
> +
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include "intel_vip_drv.h"
> +
> +static void intelvipfb_enable(struct drm_simple_display_pipe *pipe,
> +			      struct drm_crtc_state *crtc_state, struct drm_plane_state *plane_state)
> +{
> +	/*
> +	 * The frameinfo variable has to correspond to the size of the VIP Suite
> +	 * Frame Reader register 7 which will determine the maximum size used
> +	 * in this frameinfo
> +	 */
> +
> +	u32 frameinfo;
> +	struct intelvipfb_priv *priv = pipe->plane.dev->dev_private;
> +	void __iomem *base = priv->base;
> +	struct drm_plane_state *state = pipe->plane.state;
> +	dma_addr_t addr;
> +
> +	addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
> +
> +	frameinfo =
> +		readl(base + INTELVIPFB_FRAME_READER) & 0x00ffffff;
> +	writel(frameinfo, base + INTELVIPFB_FRAME_INFO);
> +	writel(addr, base + INTELVIPFB_FRAME_START);
> +	/* Finally set the control register to 1 to start streaming */
> +	writel(1, base + INTELVIPFB_CONTROL);
> +}
> +
> +static void intelvipfb_disable(struct drm_simple_display_pipe *pipe)
> +{
> +	struct intelvipfb_priv *priv = pipe->plane.dev->dev_private;
> +	void __iomem *base = priv->base;
> +	/* set the control register to 0 to stop streaming */
> +	writel(0, base + INTELVIPFB_CONTROL);
> +}
> +
> +static const struct drm_mode_config_funcs intelvipfb_mode_config_funcs = {
> +	.fb_create = drm_gem_fb_create,
> +	.atomic_check = drm_atomic_helper_check,
> +	.atomic_commit = drm_atomic_helper_commit,
> +};
> +
> +static void intelvipfb_setup_mode_config(struct drm_device *drm)
> +{
> +	drm_mode_config_init(drm);
> +	drm->mode_config.funcs = &intelvipfb_mode_config_funcs;
> +}
> +
> +static int intelvipfb_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
> +				      struct drm_plane_state *plane_state)
> +{
> +	return drm_gem_fb_prepare_fb(&pipe->plane, plane_state);
> +}
> +
> +static struct drm_simple_display_pipe_funcs fbpriv_funcs = {
> +	.prepare_fb = intelvipfb_pipe_prepare_fb,

You can use drm_gem_fb_simple_display_pipe_prepare_fb(), no need to roll
your own.

> +	.enable = intelvipfb_enable,
> +	.disable = intelvipfb_disable
> +};
> +
> +int intelvipfb_probe(struct device *dev)
> +{
> +	int retval;
> +	struct drm_device *drm;
> +	struct intelvipfb_priv *fbpriv = dev_get_drvdata(dev);
> +	struct drm_connector *connector;
> +	u32 formats[] = {DRM_FORMAT_XRGB8888};
> +
> +	drm = fbpriv->drm;
> +
> +	drm->dev_private = fbpriv;
> +
> +	intelvipfb_setup_mode_config(drm);
> +
> +	connector = intelvipfb_conn_setup(drm);
> +	if (!connector) {
> +		dev_err(drm->dev, "Connector setup failed\n");
> +		goto err_mode_config;
> +	}
> +
> +	retval = drm_simple_display_pipe_init(drm, &fbpriv->pipe,
> +					      &fbpriv_funcs, formats,
> +			ARRAY_SIZE(formats), NULL, connector);
> +	if (retval < 0) {
> +		dev_err(drm->dev, "Cannot setup simple display pipe\n");
> +		goto err_mode_config;
> +	}
> +
> +	fbpriv->fbcma = drm_fbdev_cma_init(drm,
> +			drm->mode_config.preferred_depth,
> +			drm->mode_config.num_connector);

Please use drm_fbdev_generic_setup() for fbdev emulation. It tears down
automatically on drm_dev_unregister() and you don't need the
drm_driver->lastclose hook.

All drivers that use drm_fbdev_cma_init() will move to this shortly.

Noralf.

> +
> +	drm_mode_config_reset(drm);
> +
> +	drm_dev_register(drm, 0);
> +
> +	return retval;
> +
> +err_mode_config:
> +
> +	drm_mode_config_cleanup(drm);
> +	return -ENODEV;
> +}
> +
> +int intelvipfb_remove(struct device *dev)
> +{
> +	struct intelvipfb_priv *fbpriv = dev_get_drvdata(dev);
> +	struct drm_device *drm =  fbpriv->drm;
> +
> +	drm_dev_unregister(drm);
> +
> +	if (fbpriv->fbcma)
> +		drm_fbdev_cma_fini(fbpriv->fbcma);
> +
> +	drm_mode_config_cleanup(drm);
> +	drm_dev_unref(drm);
> +
> +	return 0;
> +}
> +
> +MODULE_AUTHOR("Ong, Hean-Loong <hean.loong.ong@intel.com>");
> +MODULE_DESCRIPTION("Intel VIP Frame Buffer II driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/gpu/drm/ivip/intel_vip_drv.h b/drivers/gpu/drm/ivip/intel_vip_drv.h
> new file mode 100644
> index 0000000..0a3555d
> --- /dev/null
> +++ b/drivers/gpu/drm/ivip/intel_vip_drv.h
> @@ -0,0 +1,52 @@
> +/*
> + * Copyright (C) 2017 Intel Corporation.
> + *
> + * Intel Video and Image Processing(VIP) Frame Buffer II driver.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License along with
> + * this program.  If not, see <http://www.gnu.org/licenses/>.
> + *
> + * Authors:
> + * Ong, Hean-Loong <hean.loong.ong@intel.com>
> + *
> + */
> +#ifndef _INTEL_VIP_DRV_H
> +#define _INTEL_VIP_DRV_H
> +
> +#define DRIVER_NAME    "intelvipfb"
> +#define BYTES_PER_PIXEL	 4
> +#define CRTC_NUM	        1
> +#define CONN_NUM	        1
> +
> +/* control registers */
> +#define INTELVIPFB_CONTROL	      0
> +#define INTELVIPFB_STATUS	       0x4
> +#define INTELVIPFB_INTERRUPT	    0x8
> +#define INTELVIPFB_FRAME_COUNTER	0xC
> +#define INTELVIPFB_FRAME_DROP	   0x10
> +#define INTELVIPFB_FRAME_INFO	   0x14
> +#define INTELVIPFB_FRAME_START	  0x18
> +#define INTELVIPFB_FRAME_READER	         0x1C
> +
> +int intelvipfb_probe(struct device *dev);
> +int intelvipfb_remove(struct device *dev);
> +int intelvipfb_setup_crtc(struct drm_device *drm);
> +struct drm_connector *intelvipfb_conn_setup(struct drm_device *drm);
> +
> +struct intelvipfb_priv {
> +	struct drm_simple_display_pipe pipe;
> +	struct drm_fbdev_cma *fbcma;
> +	struct drm_device *drm;
> +	void    __iomem *base;
> +};
> +
> +#endif
> diff --git a/drivers/gpu/drm/ivip/intel_vip_of.c b/drivers/gpu/drm/ivip/intel_vip_of.c
> new file mode 100644
> index 0000000..47302f9
> --- /dev/null
> +++ b/drivers/gpu/drm/ivip/intel_vip_of.c
> @@ -0,0 +1,193 @@
> +/*
> + * intel_vip_of.c -- Intel Video and Image Processing(VIP)
> + * Frame Buffer II driver
> + *
> + * This driver supports the Intel VIP Frame Reader component.
> + * More info on the hardware can be found in the Intel Video
> + * and Image Processing Suite User Guide at this address
> + * http://www.altera.com/literature/ug/ug_vip.pdf.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * Authors:
> + * Ong, Hean-Loong <hean.loong.ong@intel.com>
> + *
> + */
> +#include <drm/drm_fb_helper.h>
> +#include <drm/drm_fb_cma_helper.h>
> +#include <drm/drm_gem_cma_helper.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_simple_kms_helper.h>
> +
> +#include <linux/component.h>
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +
> +#include "intel_vip_drv.h"
> +
> +DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
> +
> +static void intelvipfb_lastclose(struct drm_device *drm)
> +{
> +	struct intelvipfb_priv *priv = drm->dev_private;
> +
> +	drm_fbdev_cma_restore_mode(priv->fbcma);
> +}
> +
> +static struct drm_driver intelvipfb_drm = {
> +	.driver_features =
> +			DRIVER_MODESET | DRIVER_GEM |
> +			DRIVER_PRIME | DRIVER_ATOMIC,
> +	.gem_free_object_unlocked = drm_gem_cma_free_object,
> +	.gem_vm_ops = &drm_gem_cma_vm_ops,
> +	.dumb_create = drm_gem_cma_dumb_create,
> +	.dumb_destroy = drm_gem_dumb_destroy,
> +	.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,
> +	.lastclose = intelvipfb_lastclose,
> +	.name = DRIVER_NAME,
> +	.date = "20170729",
> +	.desc = "Intel FPGA VIP SUITE",
> +	.major = 1,
> +	.minor = 0,
> +	.ioctls = NULL,
> +	.patchlevel = 0,
> +	.fops = &drm_fops,
> +};
> +
> +/*
> + * Setting up information derived from OF Device Tree Nodes
> + * max-width, max-height, bits per pixel, memory port width
> + */
> +
> +static int intelvipfb_drm_setup(struct device *dev,
> +				struct intelvipfb_priv *fbpriv)
> +{
> +	struct drm_device *drm = fbpriv->drm;
> +	struct device_node *np = dev->of_node;
> +	int mem_word_width;
> +	int max_h, max_w;
> +	int ret;
> +
> +	ret = of_property_read_u32(np, "altr,max-width", &max_w);
> +	if (ret) {
> +		dev_err(dev,
> +			"Missing required parameter 'altr,max-width'");
> +		return ret;
> +	}
> +
> +	ret = of_property_read_u32(np, "altr,max-height", &max_h);
> +	if (ret) {
> +		dev_err(dev,
> +			"Missing required parameter 'altr,max-height'");
> +		return ret;
> +	}
> +
> +	ret = of_property_read_u32(np, "altr,mem-port-width", &mem_word_width);
> +	if (ret) {
> +		dev_err(dev, "Missing required parameter 'altr,mem-port-width '");
> +		return ret;
> +	}
> +
> +	if (!(mem_word_width >= 32 && mem_word_width % 32 == 0)) {
> +		dev_err(dev,
> +			"mem-word-width is set to %i. must be >= 32 and multiple of 32.",
> +			 mem_word_width);
> +		return -ENODEV;
> +	}
> +
> +	drm->mode_config.min_width = 640;
> +	drm->mode_config.min_height = 480;
> +	drm->mode_config.max_width = max_w;
> +	drm->mode_config.max_height = max_h;
> +	drm->mode_config.preferred_depth = 32;
> +
> +	return 0;
> +}
> +
> +static int intelvipfb_of_probe(struct platform_device *pdev)
> +{
> +	int retval;
> +	struct resource *reg_res;
> +	struct intelvipfb_priv *fbpriv;
> +	struct device *dev = &pdev->dev;
> +	struct drm_device *drm;
> +
> +	fbpriv = devm_kzalloc(dev, sizeof(*fbpriv), GFP_KERNEL);
> +	if (!fbpriv)
> +		return -ENOMEM;
> +
> +	/*setup DRM */
> +	drm = drm_dev_alloc(&intelvipfb_drm, dev);
> +	if (IS_ERR(drm))
> +		return PTR_ERR(drm);
> +
> +	retval = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
> +	if (retval)
> +		return -ENODEV;
> +
> +	fbpriv->drm = drm;
> +
> +	reg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!reg_res)
> +		return -ENOMEM;
> +
> +	fbpriv->base = devm_ioremap_resource(dev, reg_res);
> +
> +	if (IS_ERR(fbpriv->base)) {
> +		dev_err(dev, "devm_ioremap_resource failed\n");
> +		retval = PTR_ERR(fbpriv->base);
> +		return -ENOMEM;
> +	}
> +
> +	intelvipfb_drm_setup(dev, fbpriv);
> +
> +	dev_set_drvdata(dev, fbpriv);
> +
> +	return intelvipfb_probe(dev);
> +}
> +
> +static int intelvipfb_of_remove(struct platform_device *pdev)
> +{
> +	return intelvipfb_remove(&pdev->dev);
> +}
> +
> +/*
> + * The name vip-frame-buffer-2.0 is derived from
> + * http://www.altera.com/literature/ug/ug_vip.pdf
> + * frame buffer IP cores section 14
> + */
> +
> +static const struct of_device_id intelvipfb_of_match[] = {
> +	{ .compatible = "altr,vip-frame-buffer-2.0" },
> +	{},
> +};
> +
> +MODULE_DEVICE_TABLE(of, intelvipfb_of_match);
> +
> +static struct platform_driver intelvipfb_driver = {
> +	.probe = intelvipfb_of_probe,
> +	.remove = intelvipfb_of_remove,
> +	.driver = {
> +		.name = DRIVER_NAME,
> +		.of_match_table = intelvipfb_of_match,
> +	},
> +};
> +
> +module_platform_driver(intelvipfb_driver);