drivers/media/platform/vsp1/vsp1_uds.c - kernel/msm-4.9 - Gitiles

 /*
  * vsp1_uds.c  --  R-Car VSP1 Up and Down Scaler
  *
  * Copyright (C) 2013-2014 Renesas Electronics Corporation
  *
  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */

 #include <linux/device.h>
 #include <linux/gfp.h>

 #include <media/v4l2-subdev.h>

 #include "vsp1.h"
 #include "vsp1_dl.h"
 #include "vsp1_uds.h"

 #define UDS_MIN_SIZE				4U
 #define UDS_MAX_SIZE				8190U

 #define UDS_MIN_FACTOR				0x0100
 #define UDS_MAX_FACTOR				0xffff

 /* -----------------------------------------------------------------------------
  * Device Access
  */

 static inline void vsp1_uds_write(struct vsp1_uds *uds, struct vsp1_dl_list *dl,
 				  u32 reg, u32 data)
 {
 	vsp1_dl_list_write(dl, reg + uds->entity.index * VI6_UDS_OFFSET, data);
 }

 /* -----------------------------------------------------------------------------
  * Scaling Computation
  */

 void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_list *dl,
 			unsigned int alpha)
 {
 	struct vsp1_uds *uds = to_uds(&entity->subdev);

 	vsp1_uds_write(uds, dl, VI6_UDS_ALPVAL,
 		       alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
 }

 /*
  * uds_output_size - Return the output size for an input size and scaling ratio
  * @input: input size in pixels
  * @ratio: scaling ratio in U4.12 fixed-point format
  */
 static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
 {
 	if (ratio > 4096) {
 		/* Down-scaling */
 		unsigned int mp;

 		mp = ratio / 4096;
 		mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);

 		return (input - 1) / mp * mp * 4096 / ratio + 1;
 	} else {
 		/* Up-scaling */
 		return (input - 1) * 4096 / ratio + 1;
 	}
 }

 /*
  * uds_output_limits - Return the min and max output sizes for an input size
  * @input: input size in pixels
  * @minimum: minimum output size (returned)
  * @maximum: maximum output size (returned)
  */
 static void uds_output_limits(unsigned int input,
 			      unsigned int *minimum, unsigned int *maximum)
 {
 	*minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE);
 	*maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE);
 }

 /*
  * uds_passband_width - Return the passband filter width for a scaling ratio
  * @ratio: scaling ratio in U4.12 fixed-point format
  */
 static unsigned int uds_passband_width(unsigned int ratio)
 {
 	if (ratio >= 4096) {
 		/* Down-scaling */
 		unsigned int mp;

 		mp = ratio / 4096;
 		mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);

 		return 64 * 4096 * mp / ratio;
 	} else {
 		/* Up-scaling */
 		return 64;
 	}
 }

 static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
 {
 	/* TODO: This is an approximation that will need to be refined. */
 	return (input - 1) * 4096 / (output - 1);
 }

 /* -----------------------------------------------------------------------------
  * V4L2 Subdevice Pad Operations
  */

 static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
 			      struct v4l2_subdev_pad_config *cfg,
 			      struct v4l2_subdev_mbus_code_enum *code)
 {
 	static const unsigned int codes[] = {
 		MEDIA_BUS_FMT_ARGB8888_1X32,
 		MEDIA_BUS_FMT_AYUV8_1X32,
 	};

 	return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
 					  ARRAY_SIZE(codes));
 }

 static int uds_enum_frame_size(struct v4l2_subdev *subdev,
 			       struct v4l2_subdev_pad_config *cfg,
 			       struct v4l2_subdev_frame_size_enum *fse)
 {
 	struct vsp1_uds *uds = to_uds(subdev);
 	struct v4l2_subdev_pad_config *config;
 	struct v4l2_mbus_framefmt *format;
 	int ret = 0;

 	config = vsp1_entity_get_pad_config(&uds->entity, cfg, fse->which);
 	if (!config)
 		return -EINVAL;

 	format = vsp1_entity_get_pad_format(&uds->entity, config,
 					    UDS_PAD_SINK);

 	mutex_lock(&uds->entity.lock);

 	if (fse->index || fse->code != format->code) {
 		ret = -EINVAL;
 		goto done;
 	}

 	if (fse->pad == UDS_PAD_SINK) {
 		fse->min_width = UDS_MIN_SIZE;
 		fse->max_width = UDS_MAX_SIZE;
 		fse->min_height = UDS_MIN_SIZE;
 		fse->max_height = UDS_MAX_SIZE;
 	} else {
 		uds_output_limits(format->width, &fse->min_width,
 				  &fse->max_width);
 		uds_output_limits(format->height, &fse->min_height,
 				  &fse->max_height);
 	}

 done:
 	mutex_unlock(&uds->entity.lock);
 	return ret;
 }

 static void uds_try_format(struct vsp1_uds *uds,
 			   struct v4l2_subdev_pad_config *config,
 			   unsigned int pad, struct v4l2_mbus_framefmt *fmt)
 {
 	struct v4l2_mbus_framefmt *format;
 	unsigned int minimum;
 	unsigned int maximum;

 	switch (pad) {
 	case UDS_PAD_SINK:
 		/* Default to YUV if the requested format is not supported. */
 		if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
 		    fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
 			fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;

 		fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
 		fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
 		break;

 	case UDS_PAD_SOURCE:
 		/* The UDS scales but can't perform format conversion. */
 		format = vsp1_entity_get_pad_format(&uds->entity, config,
 						    UDS_PAD_SINK);
 		fmt->code = format->code;

 		uds_output_limits(format->width, &minimum, &maximum);
 		fmt->width = clamp(fmt->width, minimum, maximum);
 		uds_output_limits(format->height, &minimum, &maximum);
 		fmt->height = clamp(fmt->height, minimum, maximum);
 		break;
 	}

 	fmt->field = V4L2_FIELD_NONE;
 	fmt->colorspace = V4L2_COLORSPACE_SRGB;
 }

 static int uds_set_format(struct v4l2_subdev *subdev,
 			  struct v4l2_subdev_pad_config *cfg,
 			  struct v4l2_subdev_format *fmt)
 {
 	struct vsp1_uds *uds = to_uds(subdev);
 	struct v4l2_subdev_pad_config *config;
 	struct v4l2_mbus_framefmt *format;
 	int ret = 0;

 	mutex_lock(&uds->entity.lock);

 	config = vsp1_entity_get_pad_config(&uds->entity, cfg, fmt->which);
 	if (!config) {
 		ret = -EINVAL;
 		goto done;
 	}

 	uds_try_format(uds, config, fmt->pad, &fmt->format);

 	format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad);
 	*format = fmt->format;

 	if (fmt->pad == UDS_PAD_SINK) {
 		/* Propagate the format to the source pad. */
 		format = vsp1_entity_get_pad_format(&uds->entity, config,
 						    UDS_PAD_SOURCE);
 		*format = fmt->format;

 		uds_try_format(uds, config, UDS_PAD_SOURCE, format);
 	}

 done:
 	mutex_unlock(&uds->entity.lock);
 	return ret;
 }

 /* -----------------------------------------------------------------------------
  * V4L2 Subdevice Operations
  */

 static const struct v4l2_subdev_pad_ops uds_pad_ops = {
 	.init_cfg = vsp1_entity_init_cfg,
 	.enum_mbus_code = uds_enum_mbus_code,
 	.enum_frame_size = uds_enum_frame_size,
 	.get_fmt = vsp1_subdev_get_pad_format,
 	.set_fmt = uds_set_format,
 };

 static const struct v4l2_subdev_ops uds_ops = {
 	.pad    = &uds_pad_ops,
 };

 /* -----------------------------------------------------------------------------
  * VSP1 Entity Operations
  */

 static void uds_configure(struct vsp1_entity *entity,
 			  struct vsp1_pipeline *pipe,
 			  struct vsp1_dl_list *dl,
 			  enum vsp1_entity_params params)
 {
 	struct vsp1_uds *uds = to_uds(&entity->subdev);
 	const struct v4l2_mbus_framefmt *output;
 	const struct v4l2_mbus_framefmt *input;
 	unsigned int hscale;
 	unsigned int vscale;
 	bool multitap;

 	if (params != VSP1_ENTITY_PARAMS_INIT)
 		return;

 	input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 					   UDS_PAD_SINK);
 	output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 					    UDS_PAD_SOURCE);

 	hscale = uds_compute_ratio(input->width, output->width);
 	vscale = uds_compute_ratio(input->height, output->height);

 	dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);

 	/* Multi-tap scaling can't be enabled along with alpha scaling when
 	 * scaling down with a factor lower than or equal to 1/2 in either
 	 * direction.
 	 */
 	if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))
 		multitap = false;
 	else
 		multitap = true;

 	vsp1_uds_write(uds, dl, VI6_UDS_CTRL,
 		       (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
 		       (multitap ? VI6_UDS_CTRL_BC : 0));

 	vsp1_uds_write(uds, dl, VI6_UDS_PASS_BWIDTH,
 		       (uds_passband_width(hscale)
 				<< VI6_UDS_PASS_BWIDTH_H_SHIFT) |
 		       (uds_passband_width(vscale)
 				<< VI6_UDS_PASS_BWIDTH_V_SHIFT));

 	/* Set the scaling ratios and the output size. */
 	vsp1_uds_write(uds, dl, VI6_UDS_SCALE,
 		       (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
 		       (vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
 	vsp1_uds_write(uds, dl, VI6_UDS_CLIP_SIZE,
 		       (output->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
 		       (output->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
 }

 static const struct vsp1_entity_operations uds_entity_ops = {
 	.configure = uds_configure,
 };

 /* -----------------------------------------------------------------------------
  * Initialization and Cleanup
  */

 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
 {
 	struct vsp1_uds *uds;
 	char name[6];
 	int ret;

 	uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
 	if (uds == NULL)
 		return ERR_PTR(-ENOMEM);

 	uds->entity.ops = &uds_entity_ops;
 	uds->entity.type = VSP1_ENTITY_UDS;
 	uds->entity.index = index;

 	sprintf(name, "uds.%u", index);
 	ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,
 			       MEDIA_ENT_F_PROC_VIDEO_SCALER);
 	if (ret < 0)
 		return ERR_PTR(ret);

 	return uds;
 }
	/*
	* vsp1_uds.c -- R-Car VSP1 Up and Down Scaler
	*
	* Copyright (C) 2013-2014 Renesas Electronics Corporation
	*
	* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*/

	#include <linux/device.h>
	#include <linux/gfp.h>

	#include <media/v4l2-subdev.h>

	#include "vsp1.h"
	#include "vsp1_dl.h"
	#include "vsp1_uds.h"

	#define UDS_MIN_SIZE 4U
	#define UDS_MAX_SIZE 8190U

	#define UDS_MIN_FACTOR 0x0100
	#define UDS_MAX_FACTOR 0xffff

	/* -----------------------------------------------------------------------------
	* Device Access
	*/

	static inline void vsp1_uds_write(struct vsp1_uds uds, struct vsp1_dl_list dl,
	u32 reg, u32 data)
	{
	vsp1_dl_list_write(dl, reg + uds->entity.index * VI6_UDS_OFFSET, data);
	}

	/* -----------------------------------------------------------------------------
	* Scaling Computation
	*/

	void vsp1_uds_set_alpha(struct vsp1_entity entity, struct vsp1_dl_list dl,
	unsigned int alpha)
	{
	struct vsp1_uds *uds = to_uds(&entity->subdev);

	vsp1_uds_write(uds, dl, VI6_UDS_ALPVAL,
	alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
	}

	/*
	* uds_output_size - Return the output size for an input size and scaling ratio
	* @input: input size in pixels
	* @ratio: scaling ratio in U4.12 fixed-point format
	*/
	static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
	{
	if (ratio > 4096) {
	/* Down-scaling */
	unsigned int mp;

	mp = ratio / 4096;
	mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);

	return (input - 1) / mp * mp * 4096 / ratio + 1;
	} else {
	/* Up-scaling */
	return (input - 1) * 4096 / ratio + 1;
	}
	}

	/*
	* uds_output_limits - Return the min and max output sizes for an input size
	* @input: input size in pixels
	* @minimum: minimum output size (returned)
	* @maximum: maximum output size (returned)
	*/
	static void uds_output_limits(unsigned int input,
	unsigned int minimum, unsigned int maximum)
	{
	*minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE);
	*maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE);
	}

	/*
	* uds_passband_width - Return the passband filter width for a scaling ratio
	* @ratio: scaling ratio in U4.12 fixed-point format
	*/
	static unsigned int uds_passband_width(unsigned int ratio)
	{
	if (ratio >= 4096) {
	/* Down-scaling */
	unsigned int mp;

	mp = ratio / 4096;
	mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);

	return 64 * 4096 * mp / ratio;
	} else {
	/* Up-scaling */
	return 64;
	}
	}

	static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
	{
	/* TODO: This is an approximation that will need to be refined. */
	return (input - 1) * 4096 / (output - 1);
	}

	/* -----------------------------------------------------------------------------
	* V4L2 Subdevice Pad Operations
	*/

	static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
	struct v4l2_subdev_pad_config *cfg,
	struct v4l2_subdev_mbus_code_enum *code)
	{
	static const unsigned int codes[] = {
	MEDIA_BUS_FMT_ARGB8888_1X32,
	MEDIA_BUS_FMT_AYUV8_1X32,
	};

	return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
	ARRAY_SIZE(codes));
	}

	static int uds_enum_frame_size(struct v4l2_subdev *subdev,
	struct v4l2_subdev_pad_config *cfg,
	struct v4l2_subdev_frame_size_enum *fse)
	{
	struct vsp1_uds *uds = to_uds(subdev);
	struct v4l2_subdev_pad_config *config;
	struct v4l2_mbus_framefmt *format;
	int ret = 0;

	config = vsp1_entity_get_pad_config(&uds->entity, cfg, fse->which);
	if (!config)
	return -EINVAL;

	format = vsp1_entity_get_pad_format(&uds->entity, config,
	UDS_PAD_SINK);

	mutex_lock(&uds->entity.lock);

	if (fse->index \|\| fse->code != format->code) {
	ret = -EINVAL;
	goto done;
	}

	if (fse->pad == UDS_PAD_SINK) {
	fse->min_width = UDS_MIN_SIZE;
	fse->max_width = UDS_MAX_SIZE;
	fse->min_height = UDS_MIN_SIZE;
	fse->max_height = UDS_MAX_SIZE;
	} else {
	uds_output_limits(format->width, &fse->min_width,
	&fse->max_width);
	uds_output_limits(format->height, &fse->min_height,
	&fse->max_height);
	}

	done:
	mutex_unlock(&uds->entity.lock);
	return ret;
	}

	static void uds_try_format(struct vsp1_uds *uds,
	struct v4l2_subdev_pad_config *config,
	unsigned int pad, struct v4l2_mbus_framefmt *fmt)
	{
	struct v4l2_mbus_framefmt *format;
	unsigned int minimum;
	unsigned int maximum;

	switch (pad) {
	case UDS_PAD_SINK:
	/* Default to YUV if the requested format is not supported. */
	if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
	fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
	fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;

	fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
	fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
	break;

	case UDS_PAD_SOURCE:
	/* The UDS scales but can't perform format conversion. */
	format = vsp1_entity_get_pad_format(&uds->entity, config,
	UDS_PAD_SINK);
	fmt->code = format->code;

	uds_output_limits(format->width, &minimum, &maximum);
	fmt->width = clamp(fmt->width, minimum, maximum);
	uds_output_limits(format->height, &minimum, &maximum);
	fmt->height = clamp(fmt->height, minimum, maximum);
	break;
	}

	fmt->field = V4L2_FIELD_NONE;
	fmt->colorspace = V4L2_COLORSPACE_SRGB;
	}

	static int uds_set_format(struct v4l2_subdev *subdev,
	struct v4l2_subdev_pad_config *cfg,
	struct v4l2_subdev_format *fmt)
	{
	struct vsp1_uds *uds = to_uds(subdev);
	struct v4l2_subdev_pad_config *config;
	struct v4l2_mbus_framefmt *format;
	int ret = 0;

	mutex_lock(&uds->entity.lock);

	config = vsp1_entity_get_pad_config(&uds->entity, cfg, fmt->which);
	if (!config) {
	ret = -EINVAL;
	goto done;
	}

	uds_try_format(uds, config, fmt->pad, &fmt->format);

	format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad);
	*format = fmt->format;

	if (fmt->pad == UDS_PAD_SINK) {
	/* Propagate the format to the source pad. */
	format = vsp1_entity_get_pad_format(&uds->entity, config,
	UDS_PAD_SOURCE);
	*format = fmt->format;

	uds_try_format(uds, config, UDS_PAD_SOURCE, format);
	}

	done:
	mutex_unlock(&uds->entity.lock);
	return ret;
	}

	/* -----------------------------------------------------------------------------
	* V4L2 Subdevice Operations
	*/

	static const struct v4l2_subdev_pad_ops uds_pad_ops = {
	.init_cfg = vsp1_entity_init_cfg,
	.enum_mbus_code = uds_enum_mbus_code,
	.enum_frame_size = uds_enum_frame_size,
	.get_fmt = vsp1_subdev_get_pad_format,
	.set_fmt = uds_set_format,
	};

	static const struct v4l2_subdev_ops uds_ops = {
	.pad = &uds_pad_ops,
	};

	/* -----------------------------------------------------------------------------
	* VSP1 Entity Operations
	*/

	static void uds_configure(struct vsp1_entity *entity,
	struct vsp1_pipeline *pipe,
	struct vsp1_dl_list *dl,
	enum vsp1_entity_params params)
	{
	struct vsp1_uds *uds = to_uds(&entity->subdev);
	const struct v4l2_mbus_framefmt *output;
	const struct v4l2_mbus_framefmt *input;
	unsigned int hscale;
	unsigned int vscale;
	bool multitap;

	if (params != VSP1_ENTITY_PARAMS_INIT)
	return;

	input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
	UDS_PAD_SINK);
	output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
	UDS_PAD_SOURCE);

	hscale = uds_compute_ratio(input->width, output->width);
	vscale = uds_compute_ratio(input->height, output->height);

	dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);

	/* Multi-tap scaling can't be enabled along with alpha scaling when
	* scaling down with a factor lower than or equal to 1/2 in either
	* direction.
	*/
	if (uds->scale_alpha && (hscale >= 8192 \|\| vscale >= 8192))
	multitap = false;
	else
	multitap = true;

	vsp1_uds_write(uds, dl, VI6_UDS_CTRL,
	(uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) \|
	(multitap ? VI6_UDS_CTRL_BC : 0));

	vsp1_uds_write(uds, dl, VI6_UDS_PASS_BWIDTH,
	(uds_passband_width(hscale)
	<< VI6_UDS_PASS_BWIDTH_H_SHIFT) \|
	(uds_passband_width(vscale)
	<< VI6_UDS_PASS_BWIDTH_V_SHIFT));

	/* Set the scaling ratios and the output size. */
	vsp1_uds_write(uds, dl, VI6_UDS_SCALE,
	(hscale << VI6_UDS_SCALE_HFRAC_SHIFT) \|
	(vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
	vsp1_uds_write(uds, dl, VI6_UDS_CLIP_SIZE,
	(output->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) \|
	(output->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
	}

	static const struct vsp1_entity_operations uds_entity_ops = {
	.configure = uds_configure,
	};

	/* -----------------------------------------------------------------------------
	* Initialization and Cleanup
	*/

	struct vsp1_uds vsp1_uds_create(struct vsp1_device vsp1, unsigned int index)
	{
	struct vsp1_uds *uds;
	char name[6];
	int ret;

	uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
	if (uds == NULL)
	return ERR_PTR(-ENOMEM);

	uds->entity.ops = &uds_entity_ops;
	uds->entity.type = VSP1_ENTITY_UDS;
	uds->entity.index = index;

	sprintf(name, "uds.%u", index);
	ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,
	MEDIA_ENT_F_PROC_VIDEO_SCALER);
	if (ret < 0)
	return ERR_PTR(ret);

	return uds;
	}