[media] media: Add Mediatek MDP Driver

Add MDP driver for MT8173
Signed-off-by: NMinghsiu Tsai <minghsiu.tsai@mediatek.com>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/platform/Kconfig

@@ -175,6 +175,23 @@ config VIDEO_MEDIATEK_VPU
 	    To compile this driver as a module, choose M here: the
 	    module will be called mtk-vpu.
 
+config VIDEO_MEDIATEK_MDP
+	tristate "Mediatek MDP driver"
+	depends on MTK_IOMMU || COMPILE_TEST
+	depends on VIDEO_DEV && VIDEO_V4L2
+	depends on ARCH_MEDIATEK || COMPILE_TEST
+	depends on HAS_DMA
+	select VIDEOBUF2_DMA_CONTIG
+	select V4L2_MEM2MEM_DEV
+	select VIDEO_MEDIATEK_VPU
+	default n
+	---help---
+	    It is a v4l2 driver and present in Mediatek MT8173 SoCs.
+	    The driver supports for scaling and color space conversion.
+
+	    To compile this driver as a module, choose M here: the
+	    module will be called mtk-mdp.
+
 config VIDEO_MEDIATEK_VCODEC
 	tristate "Mediatek Video Codec driver"
 	depends on MTK_IOMMU || COMPILE_TEST

drivers/media/platform/Makefile

@@ -66,3 +66,5 @@ ccflags-y += -I$(srctree)/drivers/media/i2c
 obj-$(CONFIG_VIDEO_MEDIATEK_VPU)	+= mtk-vpu/
 
 obj-$(CONFIG_VIDEO_MEDIATEK_VCODEC)	+= mtk-vcodec/
+
+obj-$(CONFIG_VIDEO_MEDIATEK_MDP)	+= mtk-mdp/

drivers/media/platform/mtk-mdp/Makefile

+mtk-mdp-y += mtk_mdp_core.o
+mtk-mdp-y += mtk_mdp_comp.o
+mtk-mdp-y += mtk_mdp_m2m.o
+mtk-mdp-y += mtk_mdp_regs.o
+mtk-mdp-y += mtk_mdp_vpu.o
+
+obj-$(CONFIG_VIDEO_MEDIATEK_MDP) += mtk-mdp.o
+
+ccflags-y += -I$(srctree)/drivers/media/platform/mtk-vpu

drivers/media/platform/mtk-mdp/mtk_mdp_comp.c

+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <soc/mediatek/smi.h>
+
+#include "mtk_mdp_comp.h"
+
+
+static const char * const mtk_mdp_comp_stem[MTK_MDP_COMP_TYPE_MAX] = {
+	"mdp_rdma",
+	"mdp_rsz",
+	"mdp_wdma",
+	"mdp_wrot",
+};
+
+struct mtk_mdp_comp_match {
+	enum mtk_mdp_comp_type type;
+	int alias_id;
+};
+
+static const struct mtk_mdp_comp_match mtk_mdp_matches[MTK_MDP_COMP_ID_MAX] = {
+	{ MTK_MDP_RDMA,	0 },
+	{ MTK_MDP_RDMA,	1 },
+	{ MTK_MDP_RSZ,	0 },
+	{ MTK_MDP_RSZ,	1 },
+	{ MTK_MDP_RSZ,	2 },
+	{ MTK_MDP_WDMA,	0 },
+	{ MTK_MDP_WROT,	0 },
+	{ MTK_MDP_WROT,	1 },
+};
+
+int mtk_mdp_comp_get_id(struct device *dev, struct device_node *node,
+			enum mtk_mdp_comp_type comp_type)
+{
+	int id = of_alias_get_id(node, mtk_mdp_comp_stem[comp_type]);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(mtk_mdp_matches); i++) {
+		if (comp_type == mtk_mdp_matches[i].type &&
+		    id == mtk_mdp_matches[i].alias_id)
+			return i;
+	}
+
+	dev_err(dev, "Failed to get id. type: %d, id: %d\n", comp_type, id);
+
+	return -EINVAL;
+}
+
+void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp)
+{
+	int i, err;
+
+	if (comp->larb_dev) {
+		err = mtk_smi_larb_get(comp->larb_dev);
+		if (err)
+			dev_err(dev,
+				"failed to get larb, err %d. type:%d id:%d\n",
+				err, comp->type, comp->id);
+	}
+
+	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
+		if (!comp->clk[i])
+			continue;
+		err = clk_prepare_enable(comp->clk[i]);
+		if (err)
+			dev_err(dev,
+			"failed to enable clock, err %d. type:%d id:%d i:%d\n",
+				err, comp->type, comp->id, i);
+	}
+}
+
+void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
+		if (!comp->clk[i])
+			continue;
+		clk_disable_unprepare(comp->clk[i]);
+	}
+
+	if (comp->larb_dev)
+		mtk_smi_larb_put(comp->larb_dev);
+}
+
+int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
+		      struct mtk_mdp_comp *comp, enum mtk_mdp_comp_id comp_id)
+{
+	struct device_node *larb_node;
+	struct platform_device *larb_pdev;
+	int i;
+
+	if (comp_id < 0 || comp_id >= MTK_MDP_COMP_ID_MAX) {
+		dev_err(dev, "Invalid comp_id %d\n", comp_id);
+		return -EINVAL;
+	}
+
+	comp->dev_node = of_node_get(node);
+	comp->id = comp_id;
+	comp->type = mtk_mdp_matches[comp_id].type;
+	comp->regs = of_iomap(node, 0);
+
+	for (i = 0; i < ARRAY_SIZE(comp->clk); i++) {
+		comp->clk[i] = of_clk_get(node, i);
+
+		/* Only RDMA needs two clocks */
+		if (comp->type != MTK_MDP_RDMA)
+			break;
+	}
+
+	/* Only DMA capable components need the LARB property */
+	comp->larb_dev = NULL;
+	if (comp->type != MTK_MDP_RDMA &&
+	    comp->type != MTK_MDP_WDMA &&
+	    comp->type != MTK_MDP_WROT)
+		return 0;
+
+	larb_node = of_parse_phandle(node, "mediatek,larb", 0);
+	if (!larb_node) {
+		dev_err(dev,
+			"Missing mediadek,larb phandle in %s node\n",
+			node->full_name);
+		return -EINVAL;
+	}
+
+	larb_pdev = of_find_device_by_node(larb_node);
+	if (!larb_pdev) {
+		dev_warn(dev, "Waiting for larb device %s\n",
+			 larb_node->full_name);
+		of_node_put(larb_node);
+		return -EPROBE_DEFER;
+	}
+	of_node_put(larb_node);
+
+	comp->larb_dev = &larb_pdev->dev;
+
+	return 0;
+}
+
+void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp)
+{
+	of_node_put(comp->dev_node);
+}

drivers/media/platform/mtk-mdp/mtk_mdp_comp.h

+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __MTK_MDP_COMP_H__
+#define __MTK_MDP_COMP_H__
+
+/**
+ * enum mtk_mdp_comp_type - the MDP component
+ * @MTK_MDP_RDMA:	Read DMA
+ * @MTK_MDP_RSZ:	Riszer
+ * @MTK_MDP_WDMA:	Write DMA
+ * @MTK_MDP_WROT:	Write DMA with rotation
+ */
+enum mtk_mdp_comp_type {
+	MTK_MDP_RDMA,
+	MTK_MDP_RSZ,
+	MTK_MDP_WDMA,
+	MTK_MDP_WROT,
+	MTK_MDP_COMP_TYPE_MAX,
+};
+
+enum mtk_mdp_comp_id {
+	MTK_MDP_COMP_RDMA0,
+	MTK_MDP_COMP_RDMA1,
+	MTK_MDP_COMP_RSZ0,
+	MTK_MDP_COMP_RSZ1,
+	MTK_MDP_COMP_RSZ2,
+	MTK_MDP_COMP_WDMA,
+	MTK_MDP_COMP_WROT0,
+	MTK_MDP_COMP_WROT1,
+	MTK_MDP_COMP_ID_MAX,
+};
+
+/**
+ * struct mtk_mdp_comp - the MDP's function component data
+ * @dev_node:	component device node
+ * @clk:	clocks required for component
+ * @regs:	Mapped address of component registers.
+ * @larb_dev:	SMI device required for component
+ * @type:	component type
+ * @id:		component ID
+ */
+struct mtk_mdp_comp {
+	struct device_node	*dev_node;
+	struct clk		*clk[2];
+	void __iomem		*regs;
+	struct device		*larb_dev;
+	enum mtk_mdp_comp_type	type;
+	enum mtk_mdp_comp_id	id;
+};
+
+int mtk_mdp_comp_init(struct device *dev, struct device_node *node,
+		      struct mtk_mdp_comp *comp, enum mtk_mdp_comp_id comp_id);
+void mtk_mdp_comp_deinit(struct device *dev, struct mtk_mdp_comp *comp);
+int mtk_mdp_comp_get_id(struct device *dev, struct device_node *node,
+			enum mtk_mdp_comp_type comp_type);
+void mtk_mdp_comp_clock_on(struct device *dev, struct mtk_mdp_comp *comp);
+void mtk_mdp_comp_clock_off(struct device *dev, struct mtk_mdp_comp *comp);
+
+
+#endif /* __MTK_MDP_COMP_H__ */

drivers/media/platform/mtk-mdp/mtk_mdp_core.c

+/*
+ * Copyright (c) 2015-2016 MediaTek Inc.
+ * Author: Houlong Wei <houlong.wei@mediatek.com>
+ *         Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/workqueue.h>
+#include <soc/mediatek/smi.h>
+
+#include "mtk_mdp_core.h"
+#include "mtk_mdp_m2m.h"
+#include "mtk_vpu.h"
+
+/* MDP debug log level (0-3). 3 shows all the logs. */
+int mtk_mdp_dbg_level;
+EXPORT_SYMBOL(mtk_mdp_dbg_level);
+
+module_param(mtk_mdp_dbg_level, int, 0644);
+
+static const struct of_device_id mtk_mdp_comp_dt_ids[] = {
+	{
+		.compatible = "mediatek,mt8173-mdp-rdma",
+		.data = (void *)MTK_MDP_RDMA
+	}, {
+		.compatible = "mediatek,mt8173-mdp-rsz",
+		.data = (void *)MTK_MDP_RSZ
+	}, {
+		.compatible = "mediatek,mt8173-mdp-wdma",
+		.data = (void *)MTK_MDP_WDMA
+	}, {
+		.compatible = "mediatek,mt8173-mdp-wrot",
+		.data = (void *)MTK_MDP_WROT
+	}
+};
+
+static const struct of_device_id mtk_mdp_of_ids[] = {
+	{ .compatible = "mediatek,mt8173-mdp", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, mtk_mdp_of_ids);
+
+static void mtk_mdp_clock_on(struct mtk_mdp_dev *mdp)
+{
+	struct device *dev = &mdp->pdev->dev;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(mdp->comp); i++)
+		mtk_mdp_comp_clock_on(dev, mdp->comp[i]);
+}
+
+static void mtk_mdp_clock_off(struct mtk_mdp_dev *mdp)
+{
+	struct device *dev = &mdp->pdev->dev;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(mdp->comp); i++)
+		mtk_mdp_comp_clock_off(dev, mdp->comp[i]);
+}
+
+static void mtk_mdp_wdt_worker(struct work_struct *work)
+{
+	struct mtk_mdp_dev *mdp =
+			container_of(work, struct mtk_mdp_dev, wdt_work);
+	struct mtk_mdp_ctx *ctx;
+
+	mtk_mdp_err("Watchdog timeout");
+
+	list_for_each_entry(ctx, &mdp->ctx_list, list) {
+		mtk_mdp_dbg(0, "[%d] Change as state error", ctx->id);
+		mtk_mdp_ctx_state_lock_set(ctx, MTK_MDP_CTX_ERROR);
+	}
+}
+
+static void mtk_mdp_reset_handler(void *priv)
+{
+	struct mtk_mdp_dev *mdp = priv;
+
+	queue_work(mdp->wdt_wq, &mdp->wdt_work);
+}
+
+static int mtk_mdp_probe(struct platform_device *pdev)
+{
+	struct mtk_mdp_dev *mdp;
+	struct device *dev = &pdev->dev;
+	struct device_node *node;
+	int i, ret = 0;
+
+	mdp = devm_kzalloc(dev, sizeof(*mdp), GFP_KERNEL);
+	if (!mdp)
+		return -ENOMEM;
+
+	mdp->id = pdev->id;
+	mdp->pdev = pdev;
+	INIT_LIST_HEAD(&mdp->ctx_list);
+
+	mutex_init(&mdp->lock);
+	mutex_init(&mdp->vpulock);
+
+	/* Iterate over sibling MDP function blocks */
+	for_each_child_of_node(dev->of_node, node) {
+		const struct of_device_id *of_id;
+		enum mtk_mdp_comp_type comp_type;
+		int comp_id;
+		struct mtk_mdp_comp *comp;
+
+		of_id = of_match_node(mtk_mdp_comp_dt_ids, node);
+		if (!of_id)
+			continue;
+
+		if (!of_device_is_available(node)) {
+			dev_err(dev, "Skipping disabled component %s\n",
+				node->full_name);
+			continue;
+		}
+
+		comp_type = (enum mtk_mdp_comp_type)of_id->data;
+		comp_id = mtk_mdp_comp_get_id(dev, node, comp_type);
+		if (comp_id < 0) {
+			dev_warn(dev, "Skipping unknown component %s\n",
+				 node->full_name);
+			continue;
+		}
+
+		comp = devm_kzalloc(dev, sizeof(*comp), GFP_KERNEL);
+		if (!comp) {
+			ret = -ENOMEM;
+			goto err_comp;
+		}
+		mdp->comp[comp_id] = comp;
+
+		ret = mtk_mdp_comp_init(dev, node, comp, comp_id);
+		if (ret)
+			goto err_comp;
+	}
+
+	mdp->job_wq = create_singlethread_workqueue(MTK_MDP_MODULE_NAME);
+	if (!mdp->job_wq) {
+		dev_err(&pdev->dev, "unable to alloc job workqueue\n");
+		ret = -ENOMEM;
+		goto err_alloc_job_wq;
+	}
+
+	mdp->wdt_wq = create_singlethread_workqueue("mdp_wdt_wq");
+	if (!mdp->wdt_wq) {
+		dev_err(&pdev->dev, "unable to alloc wdt workqueue\n");
+		ret = -ENOMEM;
+		goto err_alloc_wdt_wq;
+	}
+	INIT_WORK(&mdp->wdt_work, mtk_mdp_wdt_worker);
+
+	ret = v4l2_device_register(dev, &mdp->v4l2_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register v4l2 device\n");
+		ret = -EINVAL;
+		goto err_dev_register;
+	}
+
+	ret = mtk_mdp_register_m2m_device(mdp);
+	if (ret) {
+		v4l2_err(&mdp->v4l2_dev, "Failed to init mem2mem device\n");
+		goto err_m2m_register;
+	}
+
+	mdp->vpu_dev = vpu_get_plat_device(pdev);
+	vpu_wdt_reg_handler(mdp->vpu_dev, mtk_mdp_reset_handler, mdp,
+			    VPU_RST_MDP);
+
+	platform_set_drvdata(pdev, mdp);
+
+	vb2_dma_contig_set_max_seg_size(&pdev->dev, DMA_BIT_MASK(32));
+
+	pm_runtime_enable(dev);
+	dev_dbg(dev, "mdp-%d registered successfully\n", mdp->id);
+
+	return 0;
+
+err_m2m_register:
+	v4l2_device_unregister(&mdp->v4l2_dev);
+
+err_dev_register:
+	destroy_workqueue(mdp->wdt_wq);
+
+err_alloc_wdt_wq:
+	destroy_workqueue(mdp->job_wq);
+
+err_alloc_job_wq:
+
+err_comp:
+	for (i = 0; i < ARRAY_SIZE(mdp->comp); i++)
+		mtk_mdp_comp_deinit(dev, mdp->comp[i]);
+
+	dev_dbg(dev, "err %d\n", ret);
+	return ret;
+}
+
+static int mtk_mdp_remove(struct platform_device *pdev)
+{
+	struct mtk_mdp_dev *mdp = platform_get_drvdata(pdev);
+	int i;
+
+	pm_runtime_disable(&pdev->dev);
+	vb2_dma_contig_clear_max_seg_size(&pdev->dev);
+	mtk_mdp_unregister_m2m_device(mdp);
+	v4l2_device_unregister(&mdp->v4l2_dev);
+
+	flush_workqueue(mdp->job_wq);
+	destroy_workqueue(mdp->job_wq);
+
+	for (i = 0; i < ARRAY_SIZE(mdp->comp); i++)
+		mtk_mdp_comp_deinit(&pdev->dev, mdp->comp[i]);
+
+	dev_dbg(&pdev->dev, "%s driver unloaded\n", pdev->name);
+	return 0;
+}
+
+#if defined(CONFIG_PM_RUNTIME) || defined(CONFIG_PM_SLEEP)
+static int mtk_mdp_pm_suspend(struct device *dev)
+{
+	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
+
+	mtk_mdp_clock_off(mdp);
+
+	return 0;
+}
+
+static int mtk_mdp_pm_resume(struct device *dev)
+{
+	struct mtk_mdp_dev *mdp = dev_get_drvdata(dev);
+
+	mtk_mdp_clock_on(mdp);
+
+	return 0;
+}
+#endif /* CONFIG_PM_RUNTIME || CONFIG_PM_SLEEP */
+
+#ifdef CONFIG_PM_SLEEP
+static int mtk_mdp_suspend(struct device *dev)
+{
+	if (pm_runtime_suspended(dev))
+		return 0;
+
+	return mtk_mdp_pm_suspend(dev);
+}
+
+static int mtk_mdp_resume(struct device *dev)
+{
+	if (pm_runtime_suspended(dev))
+		return 0;
+
+	return mtk_mdp_pm_resume(dev);
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops mtk_mdp_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(mtk_mdp_suspend, mtk_mdp_resume)
+	SET_RUNTIME_PM_OPS(mtk_mdp_pm_suspend, mtk_mdp_pm_resume, NULL)
+};
+
+static struct platform_driver mtk_mdp_driver = {
+	.probe		= mtk_mdp_probe,
+	.remove		= mtk_mdp_remove,
+	.driver = {
+		.name	= MTK_MDP_MODULE_NAME,
+		.owner	= THIS_MODULE,
+		.pm	= &mtk_mdp_pm_ops,
+		.of_match_table = mtk_mdp_of_ids,
+	}
+};
+
+module_platform_driver(mtk_mdp_driver);
+
+MODULE_AUTHOR("Houlong Wei <houlong.wei@mediatek.com>");
+MODULE_DESCRIPTION("Mediatek image processor driver");
+MODULE_LICENSE("GPL v2");

drivers/media/platform/mtk-mdp/mtk_mdp_core.h

+/*
+ * Copyright (c) 2015-2016 MediaTek Inc.
+ * Author: Houlong Wei <houlong.wei@mediatek.com>
+ *         Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __MTK_MDP_CORE_H__
+#define __MTK_MDP_CORE_H__
+
+#include <linux/videodev2.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-mem2mem.h>
+#include <media/videobuf2-core.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "mtk_mdp_vpu.h"
+#include "mtk_mdp_comp.h"
+
+
+#define MTK_MDP_MODULE_NAME		"mtk-mdp"
+
+#define MTK_MDP_SHUTDOWN_TIMEOUT	((100*HZ)/1000) /* 100ms */
+#define MTK_MDP_MAX_CTRL_NUM		10
+
+#define MTK_MDP_FMT_FLAG_OUTPUT		BIT(0)
+#define MTK_MDP_FMT_FLAG_CAPTURE	BIT(1)
+
+#define MTK_MDP_VPU_INIT		BIT(0)
+#define MTK_MDP_SRC_FMT			BIT(1)
+#define MTK_MDP_DST_FMT			BIT(2)
+#define MTK_MDP_CTX_ERROR		BIT(5)
+
+/**
+ *  struct mtk_mdp_pix_align - alignement of image
+ *  @org_w: source alignment of width
+ *  @org_h: source alignment of height
+ *  @target_w: dst alignment of width
+ *  @target_h: dst alignment of height
+ */
+struct mtk_mdp_pix_align {
+	u16 org_w;
+	u16 org_h;
+	u16 target_w;
+	u16 target_h;
+};
+
+/**
+ * struct mtk_mdp_fmt - the driver's internal color format data
+ * @pixelformat: the fourcc code for this format, 0 if not applicable
+ * @num_planes: number of physically non-contiguous data planes
+ * @num_comp: number of logical data planes
+ * @depth: per plane driver's private 'number of bits per pixel'
+ * @row_depth: per plane driver's private 'number of bits per pixel per row'
+ * @flags: flags indicating which operation mode format applies to
+	   MTK_MDP_FMT_FLAG_OUTPUT is used in OUTPUT stream
+	   MTK_MDP_FMT_FLAG_CAPTURE is used in CAPTURE stream
+ * @align: pointer to a pixel alignment struct, NULL if using default value
+ */
+struct mtk_mdp_fmt {
+	u32	pixelformat;
+	u16	num_planes;
+	u16	num_comp;
+	u8	depth[VIDEO_MAX_PLANES];
+	u8	row_depth[VIDEO_MAX_PLANES];
+	u32	flags;
+	struct mtk_mdp_pix_align *align;
+};
+
+/**
+ * struct mtk_mdp_addr - the image processor physical address set
+ * @addr:	address of planes
+ */
+struct mtk_mdp_addr {
+	dma_addr_t addr[MTK_MDP_MAX_NUM_PLANE];
+};
+
+/* struct mtk_mdp_ctrls - the image processor control set
+ * @rotate: rotation degree
+ * @hflip: horizontal flip
+ * @vflip: vertical flip
+ * @global_alpha: the alpha value of current frame
+ */
+struct mtk_mdp_ctrls {
+	struct v4l2_ctrl *rotate;
+	struct v4l2_ctrl *hflip;
+	struct v4l2_ctrl *vflip;
+	struct v4l2_ctrl *global_alpha;
+};
+
+/**
+ * struct mtk_mdp_frame - source/target frame properties
+ * @width:	SRC : SRCIMG_WIDTH, DST : OUTPUTDMA_WHOLE_IMG_WIDTH
+ * @height:	SRC : SRCIMG_HEIGHT, DST : OUTPUTDMA_WHOLE_IMG_HEIGHT
+ * @crop:	cropped(source)/scaled(destination) size
+ * @payload:	image size in bytes (w x h x bpp)
+ * @pitch:	bytes per line of image in memory
+ * @addr:	image frame buffer physical addresses
+ * @fmt:	color format pointer
+ * @alpha:	frame's alpha value
+ */
+struct mtk_mdp_frame {
+	u32				width;
+	u32				height;
+	struct v4l2_rect		crop;
+	unsigned long			payload[VIDEO_MAX_PLANES];
+	unsigned int			pitch[VIDEO_MAX_PLANES];
+	struct mtk_mdp_addr		addr;
+	const struct mtk_mdp_fmt	*fmt;
+	u8				alpha;
+};
+
+/**
+ * struct mtk_mdp_variant - image processor variant information
+ * @pix_max:		maximum limit of image size
+ * @pix_min:		minimun limit of image size
+ * @pix_align:		alignement of image
+ * @h_scale_up_max:	maximum scale-up in horizontal
+ * @v_scale_up_max:	maximum scale-up in vertical
+ * @h_scale_down_max:	maximum scale-down in horizontal
+ * @v_scale_down_max:	maximum scale-down in vertical
+ */
+struct mtk_mdp_variant {
+	struct mtk_mdp_pix_limit	*pix_max;
+	struct mtk_mdp_pix_limit	*pix_min;
+	struct mtk_mdp_pix_align	*pix_align;
+	u16				h_scale_up_max;
+	u16				v_scale_up_max;
+	u16				h_scale_down_max;
+	u16				v_scale_down_max;
+};
+
+/**
+ * struct mtk_mdp_dev - abstraction for image processor entity
+ * @lock:	the mutex protecting this data structure
+ * @vpulock:	the mutex protecting the communication with VPU
+ * @pdev:	pointer to the image processor platform device
+ * @variant:	the IP variant information
+ * @id:		image processor device index (0..MTK_MDP_MAX_DEVS)
+ * @comp:	MDP function components
+ * @m2m_dev:	v4l2 memory-to-memory device data
+ * @ctx_list:	list of struct mtk_mdp_ctx
+ * @vdev:	video device for image processor driver
+ * @v4l2_dev:	V4L2 device to register video devices for.
+ * @job_wq:	processor work queue
+ * @vpu_dev:	VPU platform device
+ * @ctx_num:	counter of active MTK MDP context
+ * @id_counter:	An integer id given to the next opened context
+ * @wdt_wq:	work queue for VPU watchdog
+ * @wdt_work:	worker for VPU watchdog
+ */
+struct mtk_mdp_dev {
+	struct mutex			lock;
+	struct mutex			vpulock;
+	struct platform_device		*pdev;
+	struct mtk_mdp_variant		*variant;
+	u16				id;
+	struct mtk_mdp_comp		*comp[MTK_MDP_COMP_ID_MAX];
+	struct v4l2_m2m_dev		*m2m_dev;
+	struct list_head		ctx_list;
+	struct video_device		vdev;
+	struct v4l2_device		v4l2_dev;
+	struct workqueue_struct		*job_wq;
+	struct platform_device		*vpu_dev;
+	int				ctx_num;
+	unsigned long			id_counter;
+	struct workqueue_struct		*wdt_wq;
+	struct work_struct		wdt_work;
+};
+
+/**
+ * mtk_mdp_ctx - the device context data
+ * @list:		link to ctx_list of mtk_mdp_dev
+ * @s_frame:		source frame properties
+ * @d_frame:		destination frame properties
+ * @id:			index of the context that this structure describes
+ * @flags:		additional flags for image conversion
+ * @state:		flags to keep track of user configuration
+			Protected by slock
+ * @rotation:		rotates the image by specified angle
+ * @hflip:		mirror the picture horizontally
+ * @vflip:		mirror the picture vertically
+ * @mdp_dev:		the image processor device this context applies to
+ * @m2m_ctx:		memory-to-memory device context
+ * @fh:			v4l2 file handle
+ * @ctrl_handler:	v4l2 controls handler
+ * @ctrls		image processor control set
+ * @ctrls_rdy:		true if the control handler is initialized
+ * @colorspace:		enum v4l2_colorspace; supplemental to pixelformat
+ * @ycbcr_enc:		enum v4l2_ycbcr_encoding, Y'CbCr encoding
+ * @xfer_func:		enum v4l2_xfer_func, colorspace transfer function
+ * @quant:		enum v4l2_quantization, colorspace quantization
+ * @vpu:		VPU instance
+ * @slock:		the mutex protecting mtp_mdp_ctx.state
+ * @work:		worker for image processing
+ */
+struct mtk_mdp_ctx {
+	struct list_head		list;
+	struct mtk_mdp_frame		s_frame;
+	struct mtk_mdp_frame		d_frame;
+	u32				flags;
+	u32				state;
+	int				id;
+	int				rotation;
+	u32				hflip:1;
+	u32				vflip:1;
+	struct mtk_mdp_dev		*mdp_dev;
+	struct v4l2_m2m_ctx		*m2m_ctx;
+	struct v4l2_fh			fh;
+	struct v4l2_ctrl_handler	ctrl_handler;
+	struct mtk_mdp_ctrls		ctrls;
+	bool				ctrls_rdy;
+	enum v4l2_colorspace		colorspace;
+	enum v4l2_ycbcr_encoding	ycbcr_enc;
+	enum v4l2_xfer_func		xfer_func;
+	enum v4l2_quantization		quant;
+
+	struct mtk_mdp_vpu		vpu;
+	struct mutex			slock;
+	struct work_struct		work;
+};
+
+extern int mtk_mdp_dbg_level;
+
+#if defined(DEBUG)
+
+#define mtk_mdp_dbg(level, fmt, args...)				 \
+	do {								 \
+		if (mtk_mdp_dbg_level >= level)				 \
+			pr_info("[MTK_MDP] level=%d %s(),%d: " fmt "\n", \
+				level, __func__, __LINE__, ##args);	 \
+	} while (0)
+
+#define mtk_mdp_err(fmt, args...)					\
+	pr_err("[MTK_MDP][ERROR] %s:%d: " fmt "\n", __func__, __LINE__, \
+	       ##args)
+
+
+#define mtk_mdp_dbg_enter()  mtk_mdp_dbg(3, "+")
+#define mtk_mdp_dbg_leave()  mtk_mdp_dbg(3, "-")
+
+#else
+
+#define mtk_mdp_dbg(level, fmt, args...)
+#define mtk_mdp_err(fmt, args...)
+#define mtk_mdp_dbg_enter()
+#define mtk_mdp_dbg_leave()
+
+#endif
+
+#endif /* __MTK_MDP_CORE_H__ */

drivers/media/platform/mtk-mdp/mtk_mdp_ipi.h

+/*
+ * Copyright (c) 2015-2016 MediaTek Inc.
+ * Author: Houlong Wei <houlong.wei@mediatek.com>
+ *         Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __MTK_MDP_IPI_H__
+#define __MTK_MDP_IPI_H__
+
+#define MTK_MDP_MAX_NUM_PLANE		3
+
+enum mdp_ipi_msgid {
+	AP_MDP_INIT		= 0xd000,
+	AP_MDP_DEINIT		= 0xd001,
+	AP_MDP_PROCESS		= 0xd002,
+
+	VPU_MDP_INIT_ACK	= 0xe000,
+	VPU_MDP_DEINIT_ACK	= 0xe001,
+	VPU_MDP_PROCESS_ACK	= 0xe002
+};
+
+#pragma pack(push, 4)
+
+/**
+ * struct mdp_ipi_init - for AP_MDP_INIT
+ * @msg_id   : AP_MDP_INIT
+ * @ipi_id   : IPI_MDP
+ * @ap_inst  : AP mtk_mdp_vpu address
+ */
+struct mdp_ipi_init {
+	uint32_t msg_id;
+	uint32_t ipi_id;
+	uint64_t ap_inst;
+};
+
+/**
+ * struct mdp_ipi_comm - for AP_MDP_PROCESS, AP_MDP_DEINIT
+ * @msg_id        : AP_MDP_PROCESS, AP_MDP_DEINIT
+ * @ipi_id        : IPI_MDP
+ * @ap_inst       : AP mtk_mdp_vpu address
+ * @vpu_inst_addr : VPU MDP instance address
+ */
+struct mdp_ipi_comm {
+	uint32_t msg_id;
+	uint32_t ipi_id;
+	uint64_t ap_inst;
+	uint32_t vpu_inst_addr;
+};
+
+/**
+ * struct mdp_ipi_comm_ack - for VPU_MDP_DEINIT_ACK, VPU_MDP_PROCESS_ACK
+ * @msg_id        : VPU_MDP_DEINIT_ACK, VPU_MDP_PROCESS_ACK
+ * @ipi_id        : IPI_MDP
+ * @ap_inst       : AP mtk_mdp_vpu address
+ * @vpu_inst_addr : VPU MDP instance address
+ * @status        : VPU exeuction result
+ */
+struct mdp_ipi_comm_ack {
+	uint32_t msg_id;
+	uint32_t ipi_id;
+	uint64_t ap_inst;
+	uint32_t vpu_inst_addr;
+	int32_t status;
+};
+
+/**
+ * struct mdp_config - configured for source/destination image
+ * @x        : left
+ * @y        : top
+ * @w        : width
+ * @h        : height
+ * @w_stride : bytes in horizontal
+ * @h_stride : bytes in vertical
+ * @crop_x   : cropped left
+ * @crop_y   : cropped top
+ * @crop_w   : cropped width
+ * @crop_h   : cropped height
+ * @format   : color format
+ */
+struct mdp_config {
+	int32_t x;
+	int32_t y;
+	int32_t w;
+	int32_t h;
+	int32_t w_stride;
+	int32_t h_stride;
+	int32_t crop_x;
+	int32_t crop_y;
+	int32_t crop_w;
+	int32_t crop_h;
+	int32_t format;
+};
+
+struct mdp_buffer {
+	uint64_t addr_mva[MTK_MDP_MAX_NUM_PLANE];
+	int32_t plane_size[MTK_MDP_MAX_NUM_PLANE];
+	int32_t plane_num;
+};
+
+struct mdp_config_misc {
+	int32_t orientation; /* 0, 90, 180, 270 */
+	int32_t hflip; /* 1 will enable the flip */
+	int32_t vflip; /* 1 will enable the flip */
+	int32_t alpha; /* global alpha */
+};
+
+struct mdp_process_vsi {
+	struct mdp_config src_config;
+	struct mdp_buffer src_buffer;
+	struct mdp_config dst_config;
+	struct mdp_buffer dst_buffer;
+	struct mdp_config_misc misc;
+};
+
+#pragma pack(pop)
+
+#endif /* __MTK_MDP_IPI_H__ */

drivers/media/platform/mtk-mdp/mtk_mdp_m2m.h

+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __MTK_MDP_M2M_H__
+#define __MTK_MDP_M2M_H__
+
+void mtk_mdp_ctx_state_lock_set(struct mtk_mdp_ctx *ctx, u32 state);
+int mtk_mdp_register_m2m_device(struct mtk_mdp_dev *mdp);
+void mtk_mdp_unregister_m2m_device(struct mtk_mdp_dev *mdp);
+
+#endif /* __MTK_MDP_M2M_H__ */

drivers/media/platform/mtk-mdp/mtk_mdp_regs.c

+/*
+ * Copyright (c) 2015-2016 MediaTek Inc.
+ * Author: Houlong Wei <houlong.wei@mediatek.com>
+ *         Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/platform_device.h>
+
+#include "mtk_mdp_core.h"
+#include "mtk_mdp_regs.h"
+
+
+#define MDP_COLORFMT_PACK(VIDEO, PLANE, COPLANE, HF, VF, BITS, GROUP, SWAP, ID)\
+	(((VIDEO) << 27) | ((PLANE) << 24) | ((COPLANE) << 22) |\
+	((HF) << 20) | ((VF) << 18) | ((BITS) << 8) | ((GROUP) << 6) |\
+	((SWAP) << 5) | ((ID) << 0))
+
+enum MDP_COLOR_ENUM {
+	MDP_COLOR_UNKNOWN = 0,
+	MDP_COLOR_NV12 = MDP_COLORFMT_PACK(0, 2, 1, 1, 1, 8, 1, 0, 12),
+	MDP_COLOR_I420 = MDP_COLORFMT_PACK(0, 3, 0, 1, 1, 8, 1, 0, 8),
+	MDP_COLOR_YV12 = MDP_COLORFMT_PACK(0, 3, 0, 1, 1, 8, 1, 1, 8),
+};
+
+static int32_t mtk_mdp_map_color_format(int v4l2_format)
+{
+	switch (v4l2_format) {
+	case V4L2_PIX_FMT_NV12M:
+	case V4L2_PIX_FMT_NV12:
+		return MDP_COLOR_NV12;
+	case V4L2_PIX_FMT_YUV420M:
+	case V4L2_PIX_FMT_YUV420:
+		return MDP_COLOR_I420;
+	case V4L2_PIX_FMT_YVU420:
+		return MDP_COLOR_YV12;
+	}
+
+	mtk_mdp_err("Unknown format 0x%x", v4l2_format);
+
+	return MDP_COLOR_UNKNOWN;
+}
+
+void mtk_mdp_hw_set_input_addr(struct mtk_mdp_ctx *ctx,
+			       struct mtk_mdp_addr *addr)
+{
+	struct mdp_buffer *src_buf = &ctx->vpu.vsi->src_buffer;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(addr->addr); i++)
+		src_buf->addr_mva[i] = (uint64_t)addr->addr[i];
+}
+
+void mtk_mdp_hw_set_output_addr(struct mtk_mdp_ctx *ctx,
+				struct mtk_mdp_addr *addr)
+{
+	struct mdp_buffer *dst_buf = &ctx->vpu.vsi->dst_buffer;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(addr->addr); i++)
+		dst_buf->addr_mva[i] = (uint64_t)addr->addr[i];
+}
+
+void mtk_mdp_hw_set_in_size(struct mtk_mdp_ctx *ctx)
+{
+	struct mtk_mdp_frame *frame = &ctx->s_frame;
+	struct mdp_config *config = &ctx->vpu.vsi->src_config;
+
+	/* Set input pixel offset */
+	config->crop_x = frame->crop.left;
+	config->crop_y = frame->crop.top;
+
+	/* Set input cropped size */
+	config->crop_w = frame->crop.width;
+	config->crop_h = frame->crop.height;
+
+	/* Set input original size */
+	config->x = 0;
+	config->y = 0;
+	config->w = frame->width;
+	config->h = frame->height;
+}
+
+void mtk_mdp_hw_set_in_image_format(struct mtk_mdp_ctx *ctx)
+{
+	unsigned int i;
+	struct mtk_mdp_frame *frame = &ctx->s_frame;
+	struct mdp_config *config = &ctx->vpu.vsi->src_config;
+	struct mdp_buffer *src_buf = &ctx->vpu.vsi->src_buffer;
+
+	src_buf->plane_num = frame->fmt->num_comp;
+	config->format = mtk_mdp_map_color_format(frame->fmt->pixelformat);
+	config->w_stride = 0; /* MDP will calculate it by color format. */
+	config->h_stride = 0; /* MDP will calculate it by color format. */
+
+	for (i = 0; i < src_buf->plane_num; i++)
+		src_buf->plane_size[i] = frame->payload[i];
+}
+
+void mtk_mdp_hw_set_out_size(struct mtk_mdp_ctx *ctx)
+{
+	struct mtk_mdp_frame *frame = &ctx->d_frame;
+	struct mdp_config *config = &ctx->vpu.vsi->dst_config;
+
+	config->crop_x = frame->crop.left;
+	config->crop_y = frame->crop.top;
+	config->crop_w = frame->crop.width;
+	config->crop_h = frame->crop.height;
+	config->x = 0;
+	config->y = 0;
+	config->w = frame->width;
+	config->h = frame->height;
+}
+
+void mtk_mdp_hw_set_out_image_format(struct mtk_mdp_ctx *ctx)
+{
+	unsigned int i;
+	struct mtk_mdp_frame *frame = &ctx->d_frame;
+	struct mdp_config *config = &ctx->vpu.vsi->dst_config;
+	struct mdp_buffer *dst_buf = &ctx->vpu.vsi->dst_buffer;
+
+	dst_buf->plane_num = frame->fmt->num_comp;
+	config->format = mtk_mdp_map_color_format(frame->fmt->pixelformat);
+	config->w_stride = 0; /* MDP will calculate it by color format. */
+	config->h_stride = 0; /* MDP will calculate it by color format. */
+	for (i = 0; i < dst_buf->plane_num; i++)
+		dst_buf->plane_size[i] = frame->payload[i];
+}
+
+void mtk_mdp_hw_set_rotation(struct mtk_mdp_ctx *ctx)
+{
+	struct mdp_config_misc *misc = &ctx->vpu.vsi->misc;
+
+	misc->orientation = ctx->ctrls.rotate->val;
+	misc->hflip = ctx->ctrls.hflip->val;
+	misc->vflip = ctx->ctrls.vflip->val;
+}
+
+void mtk_mdp_hw_set_global_alpha(struct mtk_mdp_ctx *ctx)
+{
+	struct mdp_config_misc *misc = &ctx->vpu.vsi->misc;
+
+	misc->alpha = ctx->ctrls.global_alpha->val;
+}

drivers/media/platform/mtk-mdp/mtk_mdp_regs.h

+/*
+ * Copyright (c) 2016 MediaTek Inc.
+ * Author: Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __MTK_MDP_REGS_H__
+#define __MTK_MDP_REGS_H__
+
+
+void mtk_mdp_hw_set_input_addr(struct mtk_mdp_ctx *ctx,
+			       struct mtk_mdp_addr *addr);
+void mtk_mdp_hw_set_output_addr(struct mtk_mdp_ctx *ctx,
+				struct mtk_mdp_addr *addr);
+void mtk_mdp_hw_set_in_size(struct mtk_mdp_ctx *ctx);
+void mtk_mdp_hw_set_in_image_format(struct mtk_mdp_ctx *ctx);
+void mtk_mdp_hw_set_out_size(struct mtk_mdp_ctx *ctx);
+void mtk_mdp_hw_set_out_image_format(struct mtk_mdp_ctx *ctx);
+void mtk_mdp_hw_set_rotation(struct mtk_mdp_ctx *ctx);
+void mtk_mdp_hw_set_global_alpha(struct mtk_mdp_ctx *ctx);
+
+
+#endif /* __MTK_MDP_REGS_H__ */

drivers/media/platform/mtk-mdp/mtk_mdp_vpu.c

+/*
+ * Copyright (c) 2015-2016 MediaTek Inc.
+ * Author: Houlong Wei <houlong.wei@mediatek.com>
+ *         Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include "mtk_mdp_core.h"
+#include "mtk_mdp_vpu.h"
+#include "mtk_vpu.h"
+
+
+static inline struct mtk_mdp_ctx *vpu_to_ctx(struct mtk_mdp_vpu *vpu)
+{
+	return container_of(vpu, struct mtk_mdp_ctx, vpu);
+}
+
+static void mtk_mdp_vpu_handle_init_ack(struct mdp_ipi_comm_ack *msg)
+{
+	struct mtk_mdp_vpu *vpu = (struct mtk_mdp_vpu *)msg->ap_inst;
+
+	/* mapping VPU address to kernel virtual address */
+	vpu->vsi = (struct mdp_process_vsi *)
+			vpu_mapping_dm_addr(vpu->pdev, msg->vpu_inst_addr);
+	vpu->inst_addr = msg->vpu_inst_addr;
+}
+
+static void mtk_mdp_vpu_ipi_handler(void *data, unsigned int len, void *priv)
+{
+	unsigned int msg_id = *(unsigned int *)data;
+	struct mdp_ipi_comm_ack *msg = (struct mdp_ipi_comm_ack *)data;
+	struct mtk_mdp_vpu *vpu = (struct mtk_mdp_vpu *)msg->ap_inst;
+	struct mtk_mdp_ctx *ctx;
+
+	vpu->failure = msg->status;
+	if (!vpu->failure) {
+		switch (msg_id) {
+		case VPU_MDP_INIT_ACK:
+			mtk_mdp_vpu_handle_init_ack(data);
+			break;
+		case VPU_MDP_DEINIT_ACK:
+		case VPU_MDP_PROCESS_ACK:
+			break;
+		default:
+			ctx = vpu_to_ctx(vpu);
+			dev_err(&ctx->mdp_dev->pdev->dev,
+				"handle unknown ipi msg:0x%x\n",
+				msg_id);
+			break;
+		}
+	} else {
+		ctx = vpu_to_ctx(vpu);
+		mtk_mdp_dbg(0, "[%d]:msg 0x%x, failure:%d", ctx->id,
+			    msg_id, vpu->failure);
+	}
+}
+
+int mtk_mdp_vpu_register(struct platform_device *pdev)
+{
+	struct mtk_mdp_dev *mdp = platform_get_drvdata(pdev);
+	int err;
+
+	err = vpu_ipi_register(mdp->vpu_dev, IPI_MDP,
+			       mtk_mdp_vpu_ipi_handler, "mdp_vpu", NULL);
+	if (err)
+		dev_err(&mdp->pdev->dev,
+			"vpu_ipi_registration fail status=%d\n", err);
+
+	return err;
+}
+
+static int mtk_mdp_vpu_send_msg(void *msg, int len, struct mtk_mdp_vpu *vpu,
+				int id)
+{
+	struct mtk_mdp_ctx *ctx = vpu_to_ctx(vpu);
+	int err;
+
+	if (!vpu->pdev) {
+		mtk_mdp_dbg(1, "[%d]:vpu pdev is NULL", ctx->id);
+		return -EINVAL;
+	}
+
+	mutex_lock(&ctx->mdp_dev->vpulock);
+	err = vpu_ipi_send(vpu->pdev, (enum ipi_id)id, msg, len);
+	if (err) {
+		mutex_unlock(&ctx->mdp_dev->vpulock);
+		dev_err(&ctx->mdp_dev->pdev->dev,
+			"vpu_ipi_send fail status %d\n", err);
+	}
+	mutex_unlock(&ctx->mdp_dev->vpulock);
+
+	return err;
+}
+
+static int mtk_mdp_vpu_send_ap_ipi(struct mtk_mdp_vpu *vpu, uint32_t msg_id)
+{
+	int err;
+	struct mdp_ipi_comm msg;
+
+	msg.msg_id = msg_id;
+	msg.ipi_id = IPI_MDP;
+	msg.vpu_inst_addr = vpu->inst_addr;
+	msg.ap_inst = (uint64_t)vpu;
+	err = mtk_mdp_vpu_send_msg((void *)&msg, sizeof(msg), vpu, IPI_MDP);
+	if (!err && vpu->failure)
+		err = -EINVAL;
+
+	return err;
+}
+
+int mtk_mdp_vpu_init(struct mtk_mdp_vpu *vpu)
+{
+	int err;
+	struct mdp_ipi_init msg;
+	struct mtk_mdp_ctx *ctx = vpu_to_ctx(vpu);
+
+	vpu->pdev = ctx->mdp_dev->vpu_dev;
+
+	msg.msg_id = AP_MDP_INIT;
+	msg.ipi_id = IPI_MDP;
+	msg.ap_inst = (uint64_t)vpu;
+	err = mtk_mdp_vpu_send_msg((void *)&msg, sizeof(msg), vpu, IPI_MDP);
+	if (!err && vpu->failure)
+		err = -EINVAL;
+
+	return err;
+}
+
+int mtk_mdp_vpu_deinit(struct mtk_mdp_vpu *vpu)
+{
+	return mtk_mdp_vpu_send_ap_ipi(vpu, AP_MDP_DEINIT);
+}
+
+int mtk_mdp_vpu_process(struct mtk_mdp_vpu *vpu)
+{
+	return mtk_mdp_vpu_send_ap_ipi(vpu, AP_MDP_PROCESS);
+}

drivers/media/platform/mtk-mdp/mtk_mdp_vpu.h

+/*
+ * Copyright (c) 2015-2016 MediaTek Inc.
+ * Author: Houlong Wei <houlong.wei@mediatek.com>
+ *         Ming Hsiu Tsai <minghsiu.tsai@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#ifndef __MTK_MDP_VPU_H__
+#define __MTK_MDP_VPU_H__
+
+#include "mtk_mdp_ipi.h"
+
+
+/**
+ * struct mtk_mdp_vpu - VPU instance for MDP
+ * @pdev	: pointer to the VPU platform device
+ * @inst_addr	: VPU MDP instance address
+ * @failure	: VPU execution result status
+ * @vsi		: VPU shared information
+ */
+struct mtk_mdp_vpu {
+	struct platform_device	*pdev;
+	uint32_t		inst_addr;
+	int32_t			failure;
+	struct mdp_process_vsi	*vsi;
+};
+
+int mtk_mdp_vpu_register(struct platform_device *pdev);
+int mtk_mdp_vpu_init(struct mtk_mdp_vpu *vpu);
+int mtk_mdp_vpu_deinit(struct mtk_mdp_vpu *vpu);
+int mtk_mdp_vpu_process(struct mtk_mdp_vpu *vpu);
+
+#endif /* __MTK_MDP_VPU_H__ */