linux/drivers/media/platform/renesas/vsp1/vsp1_uds.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * vsp1_uds.c  --  R-Car VSP1 Up and Down Scaler
 *
 * Copyright (C) 2013-2014 Renesas Electronics Corporation
 *
 * Contact: Laurent Pinchart ([email protected])
 */

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

#include <media/v4l2-subdev.h>

#include "vsp1.h"
#include "vsp1_dl.h"
#include "vsp1_pipe.h"
#include "vsp1_uds.h"

#define UDS_MIN_SIZE …
#define UDS_MAX_SIZE …

#define UDS_MIN_FACTOR …
#define UDS_MAX_FACTOR …

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

static inline void vsp1_uds_write(struct vsp1_uds *uds,
				  struct vsp1_dl_body *dlb, u32 reg, u32 data)
{ … }

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

void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_body *dlb,
			unsigned int alpha)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }

static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
{ … }

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

static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
			      struct v4l2_subdev_state *sd_state,
			      struct v4l2_subdev_mbus_code_enum *code)
{ … }

static int uds_enum_frame_size(struct v4l2_subdev *subdev,
			       struct v4l2_subdev_state *sd_state,
			       struct v4l2_subdev_frame_size_enum *fse)
{ … }

static void uds_try_format(struct vsp1_uds *uds,
			   struct v4l2_subdev_state *sd_state,
			   unsigned int pad, struct v4l2_mbus_framefmt *fmt)
{ … }

static int uds_set_format(struct v4l2_subdev *subdev,
			  struct v4l2_subdev_state *sd_state,
			  struct v4l2_subdev_format *fmt)
{ … }

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

static const struct v4l2_subdev_pad_ops uds_pad_ops = …;

static const struct v4l2_subdev_ops uds_ops = …;

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

static void uds_configure_stream(struct vsp1_entity *entity,
				 struct v4l2_subdev_state *state,
				 struct vsp1_pipeline *pipe,
				 struct vsp1_dl_list *dl,
				 struct vsp1_dl_body *dlb)
{ … }

static void uds_configure_partition(struct vsp1_entity *entity,
				    struct vsp1_pipeline *pipe,
				    const struct vsp1_partition *partition,
				    struct vsp1_dl_list *dl,
				    struct vsp1_dl_body *dlb)
{ … }

static unsigned int uds_max_width(struct vsp1_entity *entity,
				  struct v4l2_subdev_state *state,
				  struct vsp1_pipeline *pipe)
{ … }

/* -----------------------------------------------------------------------------
 * Partition Algorithm Support
 */

static void uds_partition(struct vsp1_entity *entity,
			  struct v4l2_subdev_state *state,
			  struct vsp1_pipeline *pipe,
			  struct vsp1_partition *partition,
			  unsigned int partition_idx,
			  struct v4l2_rect *window)
{ … }

static const struct vsp1_entity_operations uds_entity_ops = …;

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

struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
{ … }