drivers/staging/media/omap4iss/iss_ipipe.c - linux/kernel/git/torvalds/linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * TI OMAP4 ISS V4L2 Driver - ISP IPIPE module
  *
  * Copyright (C) 2012 Texas Instruments, Inc.
  *
  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
  */

 #include <linux/module.h>
 #include <linux/uaccess.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/mm.h>
 #include <linux/sched.h>

 #include "iss.h"
 #include "iss_regs.h"
 #include "iss_ipipe.h"

 static struct v4l2_mbus_framefmt *
 __ipipe_get_format(struct iss_ipipe_device *ipipe,
 		   struct v4l2_subdev_state *sd_state,
 		   unsigned int pad,
 		   enum v4l2_subdev_format_whence which);

 static const unsigned int ipipe_fmts[] = {
 	MEDIA_BUS_FMT_SGRBG10_1X10,
 	MEDIA_BUS_FMT_SRGGB10_1X10,
 	MEDIA_BUS_FMT_SBGGR10_1X10,
 	MEDIA_BUS_FMT_SGBRG10_1X10,
 };

 /*
  * ipipe_print_status - Print current IPIPE Module register values.
  * @ipipe: Pointer to ISS ISP IPIPE device.
  *
  * Also prints other debug information stored in the IPIPE module.
  */
 #define IPIPE_PRINT_REGISTER(iss, name)\
 	dev_dbg(iss->dev, "###IPIPE " #name "=0x%08x\n", \
 		iss_reg_read(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_##name))

 static void ipipe_print_status(struct iss_ipipe_device *ipipe)
 {
 	struct iss_device *iss = to_iss_device(ipipe);

 	dev_dbg(iss->dev, "-------------IPIPE Register dump-------------\n");

 	IPIPE_PRINT_REGISTER(iss, SRC_EN);
 	IPIPE_PRINT_REGISTER(iss, SRC_MODE);
 	IPIPE_PRINT_REGISTER(iss, SRC_FMT);
 	IPIPE_PRINT_REGISTER(iss, SRC_COL);
 	IPIPE_PRINT_REGISTER(iss, SRC_VPS);
 	IPIPE_PRINT_REGISTER(iss, SRC_VSZ);
 	IPIPE_PRINT_REGISTER(iss, SRC_HPS);
 	IPIPE_PRINT_REGISTER(iss, SRC_HSZ);
 	IPIPE_PRINT_REGISTER(iss, GCK_MMR);
 	IPIPE_PRINT_REGISTER(iss, YUV_PHS);

 	dev_dbg(iss->dev, "-----------------------------------------------\n");
 }

 /*
  * ipipe_enable - Enable/Disable IPIPE.
  * @enable: enable flag
  *
  */
 static void ipipe_enable(struct iss_ipipe_device *ipipe, u8 enable)
 {
 	struct iss_device *iss = to_iss_device(ipipe);

 	iss_reg_update(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_EN,
 		       IPIPE_SRC_EN_EN, enable ? IPIPE_SRC_EN_EN : 0);
 }

 /* -----------------------------------------------------------------------------
  * Format- and pipeline-related configuration helpers
  */

 static void ipipe_configure(struct iss_ipipe_device *ipipe)
 {
 	struct iss_device *iss = to_iss_device(ipipe);
 	struct v4l2_mbus_framefmt *format;

 	/* IPIPE_PAD_SINK */
 	format = &ipipe->formats[IPIPE_PAD_SINK];

 	/* NOTE: Currently just supporting pipeline IN: RGB, OUT: YUV422 */
 	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_FMT,
 		      IPIPE_SRC_FMT_RAW2YUV);

 	/* Enable YUV444 -> YUV422 conversion */
 	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_YUV_PHS,
 		      IPIPE_YUV_PHS_LPF);

 	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_VPS, 0);
 	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_HPS, 0);
 	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_VSZ,
 		      (format->height - 2) & IPIPE_SRC_VSZ_MASK);
 	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_HSZ,
 		      (format->width - 1) & IPIPE_SRC_HSZ_MASK);

 	/* Ignore ipipeif_wrt signal, and operate on-the-fly.  */
 	iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_MODE,
 		    IPIPE_SRC_MODE_WRT | IPIPE_SRC_MODE_OST);

 	/* HACK: Values tuned for Ducati SW (OV) */
 	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_COL,
 		      IPIPE_SRC_COL_EE_B | IPIPE_SRC_COL_EO_GB |
 		      IPIPE_SRC_COL_OE_GR | IPIPE_SRC_COL_OO_R);

 	/* IPIPE_PAD_SOURCE_VP */
 	format = &ipipe->formats[IPIPE_PAD_SOURCE_VP];
 	/* Do nothing? */
 }

 /* -----------------------------------------------------------------------------
  * V4L2 subdev operations
  */

 /*
  * ipipe_set_stream - Enable/Disable streaming on the IPIPE module
  * @sd: ISP IPIPE V4L2 subdevice
  * @enable: Enable/disable stream
  */
 static int ipipe_set_stream(struct v4l2_subdev *sd, int enable)
 {
 	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 	struct iss_device *iss = to_iss_device(ipipe);
 	int ret = 0;

 	if (ipipe->state == ISS_PIPELINE_STREAM_STOPPED) {
 		if (enable == ISS_PIPELINE_STREAM_STOPPED)
 			return 0;

 		omap4iss_isp_subclk_enable(iss, OMAP4_ISS_ISP_SUBCLK_IPIPE);

 		/* Enable clk_arm_g0 */
 		iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_GCK_MMR,
 			      IPIPE_GCK_MMR_REG);

 		/* Enable clk_pix_g[3:0] */
 		iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_GCK_PIX,
 			      IPIPE_GCK_PIX_G3 | IPIPE_GCK_PIX_G2 |
 			      IPIPE_GCK_PIX_G1 | IPIPE_GCK_PIX_G0);
 	}

 	switch (enable) {
 	case ISS_PIPELINE_STREAM_CONTINUOUS:

 		ipipe_configure(ipipe);
 		ipipe_print_status(ipipe);

 		atomic_set(&ipipe->stopping, 0);
 		ipipe_enable(ipipe, 1);
 		break;

 	case ISS_PIPELINE_STREAM_STOPPED:
 		if (ipipe->state == ISS_PIPELINE_STREAM_STOPPED)
 			return 0;
 		if (omap4iss_module_sync_idle(&sd->entity, &ipipe->wait,
 					      &ipipe->stopping))
 			ret = -ETIMEDOUT;

 		ipipe_enable(ipipe, 0);
 		omap4iss_isp_subclk_disable(iss, OMAP4_ISS_ISP_SUBCLK_IPIPE);
 		break;
 	}

 	ipipe->state = enable;
 	return ret;
 }

 static struct v4l2_mbus_framefmt *
 __ipipe_get_format(struct iss_ipipe_device *ipipe,
 		   struct v4l2_subdev_state *sd_state,
 		   unsigned int pad,
 		   enum v4l2_subdev_format_whence which)
 {
 	if (which == V4L2_SUBDEV_FORMAT_TRY)
 		return v4l2_subdev_get_try_format(&ipipe->subdev, sd_state,
 						  pad);

 	return &ipipe->formats[pad];
 }

 /*
  * ipipe_try_format - Try video format on a pad
  * @ipipe: ISS IPIPE device
  * @cfg: V4L2 subdev pad config
  * @pad: Pad number
  * @fmt: Format
  */
 static void
 ipipe_try_format(struct iss_ipipe_device *ipipe,
 		 struct v4l2_subdev_state *sd_state,
 		 unsigned int pad,
 		 struct v4l2_mbus_framefmt *fmt,
 		 enum v4l2_subdev_format_whence which)
 {
 	struct v4l2_mbus_framefmt *format;
 	unsigned int width = fmt->width;
 	unsigned int height = fmt->height;
 	unsigned int i;

 	switch (pad) {
 	case IPIPE_PAD_SINK:
 		for (i = 0; i < ARRAY_SIZE(ipipe_fmts); i++) {
 			if (fmt->code == ipipe_fmts[i])
 				break;
 		}

 		/* If not found, use SGRBG10 as default */
 		if (i >= ARRAY_SIZE(ipipe_fmts))
 			fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;

 		/* Clamp the input size. */
 		fmt->width = clamp_t(u32, width, 1, 8192);
 		fmt->height = clamp_t(u32, height, 1, 8192);
 		fmt->colorspace = V4L2_COLORSPACE_SRGB;
 		break;

 	case IPIPE_PAD_SOURCE_VP:
 		format = __ipipe_get_format(ipipe, sd_state, IPIPE_PAD_SINK,
 					    which);
 		memcpy(fmt, format, sizeof(*fmt));

 		fmt->code = MEDIA_BUS_FMT_UYVY8_1X16;
 		fmt->width = clamp_t(u32, width, 32, fmt->width);
 		fmt->height = clamp_t(u32, height, 32, fmt->height);
 		fmt->colorspace = V4L2_COLORSPACE_JPEG;
 		break;
 	}

 	fmt->field = V4L2_FIELD_NONE;
 }

 /*
  * ipipe_enum_mbus_code - Handle pixel format enumeration
  * @sd     : pointer to v4l2 subdev structure
  * @cfg    : V4L2 subdev pad config
  * @code   : pointer to v4l2_subdev_mbus_code_enum structure
  * return -EINVAL or zero on success
  */
 static int ipipe_enum_mbus_code(struct v4l2_subdev *sd,
 				struct v4l2_subdev_state *sd_state,
 				struct v4l2_subdev_mbus_code_enum *code)
 {
 	switch (code->pad) {
 	case IPIPE_PAD_SINK:
 		if (code->index >= ARRAY_SIZE(ipipe_fmts))
 			return -EINVAL;

 		code->code = ipipe_fmts[code->index];
 		break;

 	case IPIPE_PAD_SOURCE_VP:
 		/* FIXME: Forced format conversion inside IPIPE ? */
 		if (code->index != 0)
 			return -EINVAL;

 		code->code = MEDIA_BUS_FMT_UYVY8_1X16;
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 static int ipipe_enum_frame_size(struct v4l2_subdev *sd,
 				 struct v4l2_subdev_state *sd_state,
 				 struct v4l2_subdev_frame_size_enum *fse)
 {
 	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 	struct v4l2_mbus_framefmt format;

 	if (fse->index != 0)
 		return -EINVAL;

 	format.code = fse->code;
 	format.width = 1;
 	format.height = 1;
 	ipipe_try_format(ipipe, sd_state, fse->pad, &format, fse->which);
 	fse->min_width = format.width;
 	fse->min_height = format.height;

 	if (format.code != fse->code)
 		return -EINVAL;

 	format.code = fse->code;
 	format.width = -1;
 	format.height = -1;
 	ipipe_try_format(ipipe, sd_state, fse->pad, &format, fse->which);
 	fse->max_width = format.width;
 	fse->max_height = format.height;

 	return 0;
 }

 /*
  * ipipe_get_format - Retrieve the video format on a pad
  * @sd : ISP IPIPE V4L2 subdevice
  * @cfg: V4L2 subdev pad config
  * @fmt: Format
  *
  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
  * to the format type.
  */
 static int ipipe_get_format(struct v4l2_subdev *sd,
 			    struct v4l2_subdev_state *sd_state,
 			    struct v4l2_subdev_format *fmt)
 {
 	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 	struct v4l2_mbus_framefmt *format;

 	format = __ipipe_get_format(ipipe, sd_state, fmt->pad, fmt->which);
 	if (!format)
 		return -EINVAL;

 	fmt->format = *format;
 	return 0;
 }

 /*
  * ipipe_set_format - Set the video format on a pad
  * @sd : ISP IPIPE V4L2 subdevice
  * @cfg: V4L2 subdev pad config
  * @fmt: Format
  *
  * Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
  * to the format type.
  */
 static int ipipe_set_format(struct v4l2_subdev *sd,
 			    struct v4l2_subdev_state *sd_state,
 			    struct v4l2_subdev_format *fmt)
 {
 	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 	struct v4l2_mbus_framefmt *format;

 	format = __ipipe_get_format(ipipe, sd_state, fmt->pad, fmt->which);
 	if (!format)
 		return -EINVAL;

 	ipipe_try_format(ipipe, sd_state, fmt->pad, &fmt->format, fmt->which);
 	*format = fmt->format;

 	/* Propagate the format from sink to source */
 	if (fmt->pad == IPIPE_PAD_SINK) {
 		format = __ipipe_get_format(ipipe, sd_state,
 					    IPIPE_PAD_SOURCE_VP,
 					    fmt->which);
 		*format = fmt->format;
 		ipipe_try_format(ipipe, sd_state, IPIPE_PAD_SOURCE_VP, format,
 				 fmt->which);
 	}

 	return 0;
 }

 static int ipipe_link_validate(struct v4l2_subdev *sd, struct media_link *link,
 			       struct v4l2_subdev_format *source_fmt,
 			       struct v4l2_subdev_format *sink_fmt)
 {
 	/* Check if the two ends match */
 	if (source_fmt->format.width != sink_fmt->format.width ||
 	    source_fmt->format.height != sink_fmt->format.height)
 		return -EPIPE;

 	if (source_fmt->format.code != sink_fmt->format.code)
 		return -EPIPE;

 	return 0;
 }

 /*
  * ipipe_init_formats - Initialize formats on all pads
  * @sd: ISP IPIPE V4L2 subdevice
  * @fh: V4L2 subdev file handle
  *
  * Initialize all pad formats with default values. If fh is not NULL, try
  * formats are initialized on the file handle. Otherwise active formats are
  * initialized on the device.
  */
 static int ipipe_init_formats(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 {
 	struct v4l2_subdev_format format;

 	memset(&format, 0, sizeof(format));
 	format.pad = IPIPE_PAD_SINK;
 	format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
 	format.format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
 	format.format.width = 4096;
 	format.format.height = 4096;
 	ipipe_set_format(sd, fh ? fh->state : NULL, &format);

 	return 0;
 }

 /* V4L2 subdev video operations */
 static const struct v4l2_subdev_video_ops ipipe_v4l2_video_ops = {
 	.s_stream = ipipe_set_stream,
 };

 /* V4L2 subdev pad operations */
 static const struct v4l2_subdev_pad_ops ipipe_v4l2_pad_ops = {
 	.enum_mbus_code = ipipe_enum_mbus_code,
 	.enum_frame_size = ipipe_enum_frame_size,
 	.get_fmt = ipipe_get_format,
 	.set_fmt = ipipe_set_format,
 	.link_validate = ipipe_link_validate,
 };

 /* V4L2 subdev operations */
 static const struct v4l2_subdev_ops ipipe_v4l2_ops = {
 	.video = &ipipe_v4l2_video_ops,
 	.pad = &ipipe_v4l2_pad_ops,
 };

 /* V4L2 subdev internal operations */
 static const struct v4l2_subdev_internal_ops ipipe_v4l2_internal_ops = {
 	.open = ipipe_init_formats,
 };

 /* -----------------------------------------------------------------------------
  * Media entity operations
  */

 /*
  * ipipe_link_setup - Setup IPIPE connections
  * @entity: IPIPE media entity
  * @local: Pad at the local end of the link
  * @remote: Pad at the remote end of the link
  * @flags: Link flags
  *
  * return -EINVAL or zero on success
  */
 static int ipipe_link_setup(struct media_entity *entity,
 			    const struct media_pad *local,
 			    const struct media_pad *remote, u32 flags)
 {
 	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
 	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
 	struct iss_device *iss = to_iss_device(ipipe);

 	if (!is_media_entity_v4l2_subdev(remote->entity))
 		return -EINVAL;

 	switch (local->index) {
 	case IPIPE_PAD_SINK:
 		/* Read from IPIPEIF. */
 		if (!(flags & MEDIA_LNK_FL_ENABLED)) {
 			ipipe->input = IPIPE_INPUT_NONE;
 			break;
 		}

 		if (ipipe->input != IPIPE_INPUT_NONE)
 			return -EBUSY;

 		if (remote->entity == &iss->ipipeif.subdev.entity)
 			ipipe->input = IPIPE_INPUT_IPIPEIF;

 		break;

 	case IPIPE_PAD_SOURCE_VP:
 		/* Send to RESIZER */
 		if (flags & MEDIA_LNK_FL_ENABLED) {
 			if (ipipe->output & ~IPIPE_OUTPUT_VP)
 				return -EBUSY;
 			ipipe->output |= IPIPE_OUTPUT_VP;
 		} else {
 			ipipe->output &= ~IPIPE_OUTPUT_VP;
 		}
 		break;

 	default:
 		return -EINVAL;
 	}

 	return 0;
 }

 /* media operations */
 static const struct media_entity_operations ipipe_media_ops = {
 	.link_setup = ipipe_link_setup,
 	.link_validate = v4l2_subdev_link_validate,
 };

 /*
  * ipipe_init_entities - Initialize V4L2 subdev and media entity
  * @ipipe: ISS ISP IPIPE module
  *
  * Return 0 on success and a negative error code on failure.
  */
 static int ipipe_init_entities(struct iss_ipipe_device *ipipe)
 {
 	struct v4l2_subdev *sd = &ipipe->subdev;
 	struct media_pad *pads = ipipe->pads;
 	struct media_entity *me = &sd->entity;
 	int ret;

 	ipipe->input = IPIPE_INPUT_NONE;

 	v4l2_subdev_init(sd, &ipipe_v4l2_ops);
 	sd->internal_ops = &ipipe_v4l2_internal_ops;
 	strscpy(sd->name, "OMAP4 ISS ISP IPIPE", sizeof(sd->name));
 	sd->grp_id = BIT(16);	/* group ID for iss subdevs */
 	v4l2_set_subdevdata(sd, ipipe);
 	sd->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;

 	pads[IPIPE_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
 	pads[IPIPE_PAD_SOURCE_VP].flags = MEDIA_PAD_FL_SOURCE;

 	me->ops = &ipipe_media_ops;
 	ret = media_entity_pads_init(me, IPIPE_PADS_NUM, pads);
 	if (ret < 0)
 		return ret;

 	ipipe_init_formats(sd, NULL);

 	return 0;
 }

 void omap4iss_ipipe_unregister_entities(struct iss_ipipe_device *ipipe)
 {
 	v4l2_device_unregister_subdev(&ipipe->subdev);
 }

 int omap4iss_ipipe_register_entities(struct iss_ipipe_device *ipipe,
 				     struct v4l2_device *vdev)
 {
 	int ret;

 	/* Register the subdev and video node. */
 	ret = v4l2_device_register_subdev(vdev, &ipipe->subdev);
 	if (ret < 0)
 		goto error;

 	return 0;

 error:
 	omap4iss_ipipe_unregister_entities(ipipe);
 	return ret;
 }

 /* -----------------------------------------------------------------------------
  * ISP IPIPE initialisation and cleanup
  */

 /*
  * omap4iss_ipipe_init - IPIPE module initialization.
  * @iss: Device pointer specific to the OMAP4 ISS.
  *
  * TODO: Get the initialisation values from platform data.
  *
  * Return 0 on success or a negative error code otherwise.
  */
 int omap4iss_ipipe_init(struct iss_device *iss)
 {
 	struct iss_ipipe_device *ipipe = &iss->ipipe;

 	ipipe->state = ISS_PIPELINE_STREAM_STOPPED;
 	init_waitqueue_head(&ipipe->wait);

 	return ipipe_init_entities(ipipe);
 }

 /*
  * omap4iss_ipipe_cleanup - IPIPE module cleanup.
  * @iss: Device pointer specific to the OMAP4 ISS.
  */
 void omap4iss_ipipe_cleanup(struct iss_device *iss)
 {
 	struct iss_ipipe_device *ipipe = &iss->ipipe;

 	media_entity_cleanup(&ipipe->subdev.entity);
 }
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* TI OMAP4 ISS V4L2 Driver - ISP IPIPE module
	*
	* Copyright (C) 2012 Texas Instruments, Inc.
	*
	* Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
	*/

	#include <linux/module.h>
	#include <linux/uaccess.h>
	#include <linux/delay.h>
	#include <linux/device.h>
	#include <linux/dma-mapping.h>
	#include <linux/mm.h>
	#include <linux/sched.h>

	#include "iss.h"
	#include "iss_regs.h"
	#include "iss_ipipe.h"

	static struct v4l2_mbus_framefmt *
	__ipipe_get_format(struct iss_ipipe_device *ipipe,
	struct v4l2_subdev_state *sd_state,
	unsigned int pad,
	enum v4l2_subdev_format_whence which);

	static const unsigned int ipipe_fmts[] = {
	MEDIA_BUS_FMT_SGRBG10_1X10,
	MEDIA_BUS_FMT_SRGGB10_1X10,
	MEDIA_BUS_FMT_SBGGR10_1X10,
	MEDIA_BUS_FMT_SGBRG10_1X10,
	};

	/*
	* ipipe_print_status - Print current IPIPE Module register values.
	* @ipipe: Pointer to ISS ISP IPIPE device.
	*
	* Also prints other debug information stored in the IPIPE module.
	*/
	#define IPIPE_PRINT_REGISTER(iss, name)\
	dev_dbg(iss->dev, "###IPIPE " #name "=0x%08x\n", \
	iss_reg_read(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_##name))

	static void ipipe_print_status(struct iss_ipipe_device *ipipe)
	{
	struct iss_device *iss = to_iss_device(ipipe);

	dev_dbg(iss->dev, "-------------IPIPE Register dump-------------\n");

	IPIPE_PRINT_REGISTER(iss, SRC_EN);
	IPIPE_PRINT_REGISTER(iss, SRC_MODE);
	IPIPE_PRINT_REGISTER(iss, SRC_FMT);
	IPIPE_PRINT_REGISTER(iss, SRC_COL);
	IPIPE_PRINT_REGISTER(iss, SRC_VPS);
	IPIPE_PRINT_REGISTER(iss, SRC_VSZ);
	IPIPE_PRINT_REGISTER(iss, SRC_HPS);
	IPIPE_PRINT_REGISTER(iss, SRC_HSZ);
	IPIPE_PRINT_REGISTER(iss, GCK_MMR);
	IPIPE_PRINT_REGISTER(iss, YUV_PHS);

	dev_dbg(iss->dev, "-----------------------------------------------\n");
	}

	/*
	* ipipe_enable - Enable/Disable IPIPE.
	* @enable: enable flag
	*
	*/
	static void ipipe_enable(struct iss_ipipe_device *ipipe, u8 enable)
	{
	struct iss_device *iss = to_iss_device(ipipe);

	iss_reg_update(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_EN,
	IPIPE_SRC_EN_EN, enable ? IPIPE_SRC_EN_EN : 0);
	}

	/* -----------------------------------------------------------------------------
	* Format- and pipeline-related configuration helpers
	*/

	static void ipipe_configure(struct iss_ipipe_device *ipipe)
	{
	struct iss_device *iss = to_iss_device(ipipe);
	struct v4l2_mbus_framefmt *format;

	/* IPIPE_PAD_SINK */
	format = &ipipe->formats[IPIPE_PAD_SINK];

	/* NOTE: Currently just supporting pipeline IN: RGB, OUT: YUV422 */
	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_FMT,
	IPIPE_SRC_FMT_RAW2YUV);

	/* Enable YUV444 -> YUV422 conversion */
	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_YUV_PHS,
	IPIPE_YUV_PHS_LPF);

	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_VPS, 0);
	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_HPS, 0);
	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_VSZ,
	(format->height - 2) & IPIPE_SRC_VSZ_MASK);
	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_HSZ,
	(format->width - 1) & IPIPE_SRC_HSZ_MASK);

	/* Ignore ipipeif_wrt signal, and operate on-the-fly. */
	iss_reg_clr(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_MODE,
	IPIPE_SRC_MODE_WRT \| IPIPE_SRC_MODE_OST);

	/* HACK: Values tuned for Ducati SW (OV) */
	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_SRC_COL,
	IPIPE_SRC_COL_EE_B \| IPIPE_SRC_COL_EO_GB \|
	IPIPE_SRC_COL_OE_GR \| IPIPE_SRC_COL_OO_R);

	/* IPIPE_PAD_SOURCE_VP */
	format = &ipipe->formats[IPIPE_PAD_SOURCE_VP];
	/* Do nothing? */
	}

	/* -----------------------------------------------------------------------------
	* V4L2 subdev operations
	*/

	/*
	* ipipe_set_stream - Enable/Disable streaming on the IPIPE module
	* @sd: ISP IPIPE V4L2 subdevice
	* @enable: Enable/disable stream
	*/
	static int ipipe_set_stream(struct v4l2_subdev *sd, int enable)
	{
	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
	struct iss_device *iss = to_iss_device(ipipe);
	int ret = 0;

	if (ipipe->state == ISS_PIPELINE_STREAM_STOPPED) {
	if (enable == ISS_PIPELINE_STREAM_STOPPED)
	return 0;

	omap4iss_isp_subclk_enable(iss, OMAP4_ISS_ISP_SUBCLK_IPIPE);

	/* Enable clk_arm_g0 */
	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_GCK_MMR,
	IPIPE_GCK_MMR_REG);

	/* Enable clk_pix_g[3:0] */
	iss_reg_write(iss, OMAP4_ISS_MEM_ISP_IPIPE, IPIPE_GCK_PIX,
	IPIPE_GCK_PIX_G3 \| IPIPE_GCK_PIX_G2 \|
	IPIPE_GCK_PIX_G1 \| IPIPE_GCK_PIX_G0);
	}

	switch (enable) {
	case ISS_PIPELINE_STREAM_CONTINUOUS:

	ipipe_configure(ipipe);
	ipipe_print_status(ipipe);

	atomic_set(&ipipe->stopping, 0);
	ipipe_enable(ipipe, 1);
	break;

	case ISS_PIPELINE_STREAM_STOPPED:
	if (ipipe->state == ISS_PIPELINE_STREAM_STOPPED)
	return 0;
	if (omap4iss_module_sync_idle(&sd->entity, &ipipe->wait,
	&ipipe->stopping))
	ret = -ETIMEDOUT;

	ipipe_enable(ipipe, 0);
	omap4iss_isp_subclk_disable(iss, OMAP4_ISS_ISP_SUBCLK_IPIPE);
	break;
	}

	ipipe->state = enable;
	return ret;
	}

	static struct v4l2_mbus_framefmt *
	__ipipe_get_format(struct iss_ipipe_device *ipipe,
	struct v4l2_subdev_state *sd_state,
	unsigned int pad,
	enum v4l2_subdev_format_whence which)
	{
	if (which == V4L2_SUBDEV_FORMAT_TRY)
	return v4l2_subdev_get_try_format(&ipipe->subdev, sd_state,
	pad);

	return &ipipe->formats[pad];
	}

	/*
	* ipipe_try_format - Try video format on a pad
	* @ipipe: ISS IPIPE device
	* @cfg: V4L2 subdev pad config
	* @pad: Pad number
	* @fmt: Format
	*/
	static void
	ipipe_try_format(struct iss_ipipe_device *ipipe,
	struct v4l2_subdev_state *sd_state,
	unsigned int pad,
	struct v4l2_mbus_framefmt *fmt,
	enum v4l2_subdev_format_whence which)
	{
	struct v4l2_mbus_framefmt *format;
	unsigned int width = fmt->width;
	unsigned int height = fmt->height;
	unsigned int i;

	switch (pad) {
	case IPIPE_PAD_SINK:
	for (i = 0; i < ARRAY_SIZE(ipipe_fmts); i++) {
	if (fmt->code == ipipe_fmts[i])
	break;
	}

	/* If not found, use SGRBG10 as default */
	if (i >= ARRAY_SIZE(ipipe_fmts))
	fmt->code = MEDIA_BUS_FMT_SGRBG10_1X10;

	/* Clamp the input size. */
	fmt->width = clamp_t(u32, width, 1, 8192);
	fmt->height = clamp_t(u32, height, 1, 8192);
	fmt->colorspace = V4L2_COLORSPACE_SRGB;
	break;

	case IPIPE_PAD_SOURCE_VP:
	format = __ipipe_get_format(ipipe, sd_state, IPIPE_PAD_SINK,
	which);
	memcpy(fmt, format, sizeof(*fmt));

	fmt->code = MEDIA_BUS_FMT_UYVY8_1X16;
	fmt->width = clamp_t(u32, width, 32, fmt->width);
	fmt->height = clamp_t(u32, height, 32, fmt->height);
	fmt->colorspace = V4L2_COLORSPACE_JPEG;
	break;
	}

	fmt->field = V4L2_FIELD_NONE;
	}

	/*
	* ipipe_enum_mbus_code - Handle pixel format enumeration
	* @sd : pointer to v4l2 subdev structure
	* @cfg : V4L2 subdev pad config
	* @code : pointer to v4l2_subdev_mbus_code_enum structure
	* return -EINVAL or zero on success
	*/
	static int ipipe_enum_mbus_code(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_mbus_code_enum *code)
	{
	switch (code->pad) {
	case IPIPE_PAD_SINK:
	if (code->index >= ARRAY_SIZE(ipipe_fmts))
	return -EINVAL;

	code->code = ipipe_fmts[code->index];
	break;

	case IPIPE_PAD_SOURCE_VP:
	/* FIXME: Forced format conversion inside IPIPE ? */
	if (code->index != 0)
	return -EINVAL;

	code->code = MEDIA_BUS_FMT_UYVY8_1X16;
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}

	static int ipipe_enum_frame_size(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_frame_size_enum *fse)
	{
	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt format;

	if (fse->index != 0)
	return -EINVAL;

	format.code = fse->code;
	format.width = 1;
	format.height = 1;
	ipipe_try_format(ipipe, sd_state, fse->pad, &format, fse->which);
	fse->min_width = format.width;
	fse->min_height = format.height;

	if (format.code != fse->code)
	return -EINVAL;

	format.code = fse->code;
	format.width = -1;
	format.height = -1;
	ipipe_try_format(ipipe, sd_state, fse->pad, &format, fse->which);
	fse->max_width = format.width;
	fse->max_height = format.height;

	return 0;
	}

	/*
	* ipipe_get_format - Retrieve the video format on a pad
	* @sd : ISP IPIPE V4L2 subdevice
	* @cfg: V4L2 subdev pad config
	* @fmt: Format
	*
	* Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
	* to the format type.
	*/
	static int ipipe_get_format(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_format *fmt)
	{
	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *format;

	format = __ipipe_get_format(ipipe, sd_state, fmt->pad, fmt->which);
	if (!format)
	return -EINVAL;

	fmt->format = *format;
	return 0;
	}

	/*
	* ipipe_set_format - Set the video format on a pad
	* @sd : ISP IPIPE V4L2 subdevice
	* @cfg: V4L2 subdev pad config
	* @fmt: Format
	*
	* Return 0 on success or -EINVAL if the pad is invalid or doesn't correspond
	* to the format type.
	*/
	static int ipipe_set_format(struct v4l2_subdev *sd,
	struct v4l2_subdev_state *sd_state,
	struct v4l2_subdev_format *fmt)
	{
	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
	struct v4l2_mbus_framefmt *format;

	format = __ipipe_get_format(ipipe, sd_state, fmt->pad, fmt->which);
	if (!format)
	return -EINVAL;

	ipipe_try_format(ipipe, sd_state, fmt->pad, &fmt->format, fmt->which);
	*format = fmt->format;

	/* Propagate the format from sink to source */
	if (fmt->pad == IPIPE_PAD_SINK) {
	format = __ipipe_get_format(ipipe, sd_state,
	IPIPE_PAD_SOURCE_VP,
	fmt->which);
	*format = fmt->format;
	ipipe_try_format(ipipe, sd_state, IPIPE_PAD_SOURCE_VP, format,
	fmt->which);
	}

	return 0;
	}

	static int ipipe_link_validate(struct v4l2_subdev sd, struct media_link link,
	struct v4l2_subdev_format *source_fmt,
	struct v4l2_subdev_format *sink_fmt)
	{
	/* Check if the two ends match */
	if (source_fmt->format.width != sink_fmt->format.width \|\|
	source_fmt->format.height != sink_fmt->format.height)
	return -EPIPE;

	if (source_fmt->format.code != sink_fmt->format.code)
	return -EPIPE;

	return 0;
	}

	/*
	* ipipe_init_formats - Initialize formats on all pads
	* @sd: ISP IPIPE V4L2 subdevice
	* @fh: V4L2 subdev file handle
	*
	* Initialize all pad formats with default values. If fh is not NULL, try
	* formats are initialized on the file handle. Otherwise active formats are
	* initialized on the device.
	*/
	static int ipipe_init_formats(struct v4l2_subdev sd, struct v4l2_subdev_fh fh)
	{
	struct v4l2_subdev_format format;

	memset(&format, 0, sizeof(format));
	format.pad = IPIPE_PAD_SINK;
	format.which = fh ? V4L2_SUBDEV_FORMAT_TRY : V4L2_SUBDEV_FORMAT_ACTIVE;
	format.format.code = MEDIA_BUS_FMT_SGRBG10_1X10;
	format.format.width = 4096;
	format.format.height = 4096;
	ipipe_set_format(sd, fh ? fh->state : NULL, &format);

	return 0;
	}

	/* V4L2 subdev video operations */
	static const struct v4l2_subdev_video_ops ipipe_v4l2_video_ops = {
	.s_stream = ipipe_set_stream,
	};

	/* V4L2 subdev pad operations */
	static const struct v4l2_subdev_pad_ops ipipe_v4l2_pad_ops = {
	.enum_mbus_code = ipipe_enum_mbus_code,
	.enum_frame_size = ipipe_enum_frame_size,
	.get_fmt = ipipe_get_format,
	.set_fmt = ipipe_set_format,
	.link_validate = ipipe_link_validate,
	};

	/* V4L2 subdev operations */
	static const struct v4l2_subdev_ops ipipe_v4l2_ops = {
	.video = &ipipe_v4l2_video_ops,
	.pad = &ipipe_v4l2_pad_ops,
	};

	/* V4L2 subdev internal operations */
	static const struct v4l2_subdev_internal_ops ipipe_v4l2_internal_ops = {
	.open = ipipe_init_formats,
	};

	/* -----------------------------------------------------------------------------
	* Media entity operations
	*/

	/*
	* ipipe_link_setup - Setup IPIPE connections
	* @entity: IPIPE media entity
	* @local: Pad at the local end of the link
	* @remote: Pad at the remote end of the link
	* @flags: Link flags
	*
	* return -EINVAL or zero on success
	*/
	static int ipipe_link_setup(struct media_entity *entity,
	const struct media_pad *local,
	const struct media_pad *remote, u32 flags)
	{
	struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
	struct iss_ipipe_device *ipipe = v4l2_get_subdevdata(sd);
	struct iss_device *iss = to_iss_device(ipipe);

	if (!is_media_entity_v4l2_subdev(remote->entity))
	return -EINVAL;

	switch (local->index) {
	case IPIPE_PAD_SINK:
	/* Read from IPIPEIF. */
	if (!(flags & MEDIA_LNK_FL_ENABLED)) {
	ipipe->input = IPIPE_INPUT_NONE;
	break;
	}

	if (ipipe->input != IPIPE_INPUT_NONE)
	return -EBUSY;

	if (remote->entity == &iss->ipipeif.subdev.entity)
	ipipe->input = IPIPE_INPUT_IPIPEIF;

	break;

	case IPIPE_PAD_SOURCE_VP:
	/* Send to RESIZER */
	if (flags & MEDIA_LNK_FL_ENABLED) {
	if (ipipe->output & ~IPIPE_OUTPUT_VP)
	return -EBUSY;
	ipipe->output \|= IPIPE_OUTPUT_VP;
	} else {
	ipipe->output &= ~IPIPE_OUTPUT_VP;
	}
	break;

	default:
	return -EINVAL;
	}

	return 0;
	}

	/* media operations */
	static const struct media_entity_operations ipipe_media_ops = {
	.link_setup = ipipe_link_setup,
	.link_validate = v4l2_subdev_link_validate,
	};

	/*
	* ipipe_init_entities - Initialize V4L2 subdev and media entity
	* @ipipe: ISS ISP IPIPE module
	*
	* Return 0 on success and a negative error code on failure.
	*/
	static int ipipe_init_entities(struct iss_ipipe_device *ipipe)
	{
	struct v4l2_subdev *sd = &ipipe->subdev;
	struct media_pad *pads = ipipe->pads;
	struct media_entity *me = &sd->entity;
	int ret;

	ipipe->input = IPIPE_INPUT_NONE;

	v4l2_subdev_init(sd, &ipipe_v4l2_ops);
	sd->internal_ops = &ipipe_v4l2_internal_ops;
	strscpy(sd->name, "OMAP4 ISS ISP IPIPE", sizeof(sd->name));
	sd->grp_id = BIT(16); /* group ID for iss subdevs */
	v4l2_set_subdevdata(sd, ipipe);
	sd->flags \|= V4L2_SUBDEV_FL_HAS_DEVNODE;

	pads[IPIPE_PAD_SINK].flags = MEDIA_PAD_FL_SINK;
	pads[IPIPE_PAD_SOURCE_VP].flags = MEDIA_PAD_FL_SOURCE;

	me->ops = &ipipe_media_ops;
	ret = media_entity_pads_init(me, IPIPE_PADS_NUM, pads);
	if (ret < 0)
	return ret;

	ipipe_init_formats(sd, NULL);

	return 0;
	}

	void omap4iss_ipipe_unregister_entities(struct iss_ipipe_device *ipipe)
	{
	v4l2_device_unregister_subdev(&ipipe->subdev);
	}

	int omap4iss_ipipe_register_entities(struct iss_ipipe_device *ipipe,
	struct v4l2_device *vdev)
	{
	int ret;

	/* Register the subdev and video node. */
	ret = v4l2_device_register_subdev(vdev, &ipipe->subdev);
	if (ret < 0)
	goto error;

	return 0;

	error:
	omap4iss_ipipe_unregister_entities(ipipe);
	return ret;
	}

	/* -----------------------------------------------------------------------------
	* ISP IPIPE initialisation and cleanup
	*/

	/*
	* omap4iss_ipipe_init - IPIPE module initialization.
	* @iss: Device pointer specific to the OMAP4 ISS.
	*
	* TODO: Get the initialisation values from platform data.
	*
	* Return 0 on success or a negative error code otherwise.
	*/
	int omap4iss_ipipe_init(struct iss_device *iss)
	{
	struct iss_ipipe_device *ipipe = &iss->ipipe;

	ipipe->state = ISS_PIPELINE_STREAM_STOPPED;
	init_waitqueue_head(&ipipe->wait);

	return ipipe_init_entities(ipipe);
	}

	/*
	* omap4iss_ipipe_cleanup - IPIPE module cleanup.
	* @iss: Device pointer specific to the OMAP4 ISS.
	*/
	void omap4iss_ipipe_cleanup(struct iss_device *iss)
	{
	struct iss_ipipe_device *ipipe = &iss->ipipe;

	media_entity_cleanup(&ipipe->subdev.entity);
	}