// SPDX-License-Identifier: GPL-2.0+
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/*
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* vsp1_uds.c -- R-Car VSP1 Up and Down Scaler
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*
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* Copyright (C) 2013-2014 Renesas Electronics Corporation
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*
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* Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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*/
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#include <linux/device.h>
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#include <linux/gfp.h>
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#include <media/v4l2-subdev.h>
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#include "vsp1.h"
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#include "vsp1_dl.h"
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#include "vsp1_pipe.h"
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#include "vsp1_uds.h"
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#define UDS_MIN_SIZE 4U
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#define UDS_MAX_SIZE 8190U
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#define UDS_MIN_FACTOR 0x0100
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#define UDS_MAX_FACTOR 0xffff
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/* -----------------------------------------------------------------------------
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* Device Access
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*/
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static inline void vsp1_uds_write(struct vsp1_uds *uds,
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struct vsp1_dl_body *dlb, u32 reg, u32 data)
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{
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vsp1_dl_body_write(dlb, reg + uds->entity.index * VI6_UDS_OFFSET, data);
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}
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/* -----------------------------------------------------------------------------
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* Scaling Computation
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*/
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void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_body *dlb,
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unsigned int alpha)
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{
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struct vsp1_uds *uds = to_uds(&entity->subdev);
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vsp1_uds_write(uds, dlb, VI6_UDS_ALPVAL,
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alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
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}
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/*
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* uds_output_size - Return the output size for an input size and scaling ratio
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* @input: input size in pixels
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* @ratio: scaling ratio in U4.12 fixed-point format
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*/
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static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
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{
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if (ratio > 4096) {
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/* Down-scaling */
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unsigned int mp;
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mp = ratio / 4096;
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mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
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return (input - 1) / mp * mp * 4096 / ratio + 1;
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} else {
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/* Up-scaling */
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return (input - 1) * 4096 / ratio + 1;
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}
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}
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/*
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* uds_output_limits - Return the min and max output sizes for an input size
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* @input: input size in pixels
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* @minimum: minimum output size (returned)
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* @maximum: maximum output size (returned)
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*/
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static void uds_output_limits(unsigned int input,
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unsigned int *minimum, unsigned int *maximum)
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{
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*minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE);
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*maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE);
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}
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/*
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* uds_passband_width - Return the passband filter width for a scaling ratio
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* @ratio: scaling ratio in U4.12 fixed-point format
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*/
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static unsigned int uds_passband_width(unsigned int ratio)
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{
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if (ratio >= 4096) {
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/* Down-scaling */
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unsigned int mp;
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mp = ratio / 4096;
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mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
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return 64 * 4096 * mp / ratio;
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} else {
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/* Up-scaling */
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return 64;
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}
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}
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static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
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{
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/* TODO: This is an approximation that will need to be refined. */
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return (input - 1) * 4096 / (output - 1);
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}
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/* -----------------------------------------------------------------------------
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* V4L2 Subdevice Pad Operations
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*/
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static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_mbus_code_enum *code)
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{
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static const unsigned int codes[] = {
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MEDIA_BUS_FMT_ARGB8888_1X32,
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MEDIA_BUS_FMT_AYUV8_1X32,
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};
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return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
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ARRAY_SIZE(codes));
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}
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static int uds_enum_frame_size(struct v4l2_subdev *subdev,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_frame_size_enum *fse)
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{
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struct vsp1_uds *uds = to_uds(subdev);
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struct v4l2_subdev_pad_config *config;
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struct v4l2_mbus_framefmt *format;
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int ret = 0;
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config = vsp1_entity_get_pad_config(&uds->entity, cfg, fse->which);
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if (!config)
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return -EINVAL;
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format = vsp1_entity_get_pad_format(&uds->entity, config,
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UDS_PAD_SINK);
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mutex_lock(&uds->entity.lock);
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if (fse->index || fse->code != format->code) {
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ret = -EINVAL;
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goto done;
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}
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if (fse->pad == UDS_PAD_SINK) {
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fse->min_width = UDS_MIN_SIZE;
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fse->max_width = UDS_MAX_SIZE;
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fse->min_height = UDS_MIN_SIZE;
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fse->max_height = UDS_MAX_SIZE;
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} else {
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uds_output_limits(format->width, &fse->min_width,
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&fse->max_width);
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uds_output_limits(format->height, &fse->min_height,
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&fse->max_height);
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}
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done:
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mutex_unlock(&uds->entity.lock);
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return ret;
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}
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static void uds_try_format(struct vsp1_uds *uds,
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struct v4l2_subdev_pad_config *config,
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unsigned int pad, struct v4l2_mbus_framefmt *fmt)
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{
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struct v4l2_mbus_framefmt *format;
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unsigned int minimum;
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unsigned int maximum;
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switch (pad) {
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case UDS_PAD_SINK:
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/* Default to YUV if the requested format is not supported. */
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if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
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fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
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fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
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fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
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fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
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break;
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case UDS_PAD_SOURCE:
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/* The UDS scales but can't perform format conversion. */
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format = vsp1_entity_get_pad_format(&uds->entity, config,
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UDS_PAD_SINK);
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fmt->code = format->code;
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uds_output_limits(format->width, &minimum, &maximum);
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fmt->width = clamp(fmt->width, minimum, maximum);
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uds_output_limits(format->height, &minimum, &maximum);
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fmt->height = clamp(fmt->height, minimum, maximum);
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break;
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}
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fmt->field = V4L2_FIELD_NONE;
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fmt->colorspace = V4L2_COLORSPACE_SRGB;
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}
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static int uds_set_format(struct v4l2_subdev *subdev,
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struct v4l2_subdev_pad_config *cfg,
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struct v4l2_subdev_format *fmt)
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{
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struct vsp1_uds *uds = to_uds(subdev);
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struct v4l2_subdev_pad_config *config;
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struct v4l2_mbus_framefmt *format;
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int ret = 0;
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mutex_lock(&uds->entity.lock);
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config = vsp1_entity_get_pad_config(&uds->entity, cfg, fmt->which);
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if (!config) {
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ret = -EINVAL;
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goto done;
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}
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uds_try_format(uds, config, fmt->pad, &fmt->format);
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format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad);
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*format = fmt->format;
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if (fmt->pad == UDS_PAD_SINK) {
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/* Propagate the format to the source pad. */
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format = vsp1_entity_get_pad_format(&uds->entity, config,
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UDS_PAD_SOURCE);
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*format = fmt->format;
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uds_try_format(uds, config, UDS_PAD_SOURCE, format);
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}
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done:
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mutex_unlock(&uds->entity.lock);
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return ret;
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}
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/* -----------------------------------------------------------------------------
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* V4L2 Subdevice Operations
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*/
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static const struct v4l2_subdev_pad_ops uds_pad_ops = {
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.init_cfg = vsp1_entity_init_cfg,
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.enum_mbus_code = uds_enum_mbus_code,
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.enum_frame_size = uds_enum_frame_size,
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.get_fmt = vsp1_subdev_get_pad_format,
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.set_fmt = uds_set_format,
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};
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static const struct v4l2_subdev_ops uds_ops = {
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.pad = &uds_pad_ops,
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};
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/* -----------------------------------------------------------------------------
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* VSP1 Entity Operations
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*/
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static void uds_configure_stream(struct vsp1_entity *entity,
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struct vsp1_pipeline *pipe,
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struct vsp1_dl_list *dl,
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struct vsp1_dl_body *dlb)
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{
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struct vsp1_uds *uds = to_uds(&entity->subdev);
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const struct v4l2_mbus_framefmt *output;
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const struct v4l2_mbus_framefmt *input;
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unsigned int hscale;
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unsigned int vscale;
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bool multitap;
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input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
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UDS_PAD_SINK);
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output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
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UDS_PAD_SOURCE);
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hscale = uds_compute_ratio(input->width, output->width);
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vscale = uds_compute_ratio(input->height, output->height);
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dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);
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/*
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* Multi-tap scaling can't be enabled along with alpha scaling when
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* scaling down with a factor lower than or equal to 1/2 in either
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* direction.
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*/
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if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))
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multitap = false;
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else
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multitap = true;
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vsp1_uds_write(uds, dlb, VI6_UDS_CTRL,
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(uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
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(multitap ? VI6_UDS_CTRL_BC : 0));
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vsp1_uds_write(uds, dlb, VI6_UDS_PASS_BWIDTH,
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(uds_passband_width(hscale)
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<< VI6_UDS_PASS_BWIDTH_H_SHIFT) |
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(uds_passband_width(vscale)
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<< VI6_UDS_PASS_BWIDTH_V_SHIFT));
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/* Set the scaling ratios. */
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vsp1_uds_write(uds, dlb, VI6_UDS_SCALE,
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(hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
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(vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
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}
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static void uds_configure_partition(struct vsp1_entity *entity,
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struct vsp1_pipeline *pipe,
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struct vsp1_dl_list *dl,
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struct vsp1_dl_body *dlb)
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{
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struct vsp1_uds *uds = to_uds(&entity->subdev);
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struct vsp1_partition *partition = pipe->partition;
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const struct v4l2_mbus_framefmt *output;
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output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
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UDS_PAD_SOURCE);
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/* Input size clipping. */
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vsp1_uds_write(uds, dlb, VI6_UDS_HSZCLIP, VI6_UDS_HSZCLIP_HCEN |
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(0 << VI6_UDS_HSZCLIP_HCL_OFST_SHIFT) |
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(partition->uds_sink.width
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<< VI6_UDS_HSZCLIP_HCL_SIZE_SHIFT));
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/* Output size clipping. */
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vsp1_uds_write(uds, dlb, VI6_UDS_CLIP_SIZE,
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(partition->uds_source.width
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<< VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
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(output->height
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<< VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
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}
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static unsigned int uds_max_width(struct vsp1_entity *entity,
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struct vsp1_pipeline *pipe)
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{
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struct vsp1_uds *uds = to_uds(&entity->subdev);
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const struct v4l2_mbus_framefmt *output;
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const struct v4l2_mbus_framefmt *input;
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unsigned int hscale;
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input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
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UDS_PAD_SINK);
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output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
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UDS_PAD_SOURCE);
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hscale = output->width / input->width;
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/*
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* The maximum width of the UDS is 304 pixels. These are input pixels
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* in the event of up-scaling, and output pixels in the event of
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* downscaling.
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*
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* To support overlapping partition windows we clamp at units of 256 and
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* the remaining pixels are reserved.
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*/
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if (hscale <= 2)
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return 256;
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else if (hscale <= 4)
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return 512;
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else if (hscale <= 8)
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return 1024;
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else
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return 2048;
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}
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/* -----------------------------------------------------------------------------
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* Partition Algorithm Support
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*/
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static void uds_partition(struct vsp1_entity *entity,
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struct vsp1_pipeline *pipe,
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struct vsp1_partition *partition,
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unsigned int partition_idx,
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struct vsp1_partition_window *window)
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{
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struct vsp1_uds *uds = to_uds(&entity->subdev);
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const struct v4l2_mbus_framefmt *output;
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const struct v4l2_mbus_framefmt *input;
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/* Initialise the partition state. */
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partition->uds_sink = *window;
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partition->uds_source = *window;
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input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
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UDS_PAD_SINK);
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output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
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UDS_PAD_SOURCE);
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partition->uds_sink.width = window->width * input->width
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/ output->width;
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partition->uds_sink.left = window->left * input->width
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/ output->width;
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*window = partition->uds_sink;
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}
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static const struct vsp1_entity_operations uds_entity_ops = {
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.configure_stream = uds_configure_stream,
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.configure_partition = uds_configure_partition,
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.max_width = uds_max_width,
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.partition = uds_partition,
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};
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/* -----------------------------------------------------------------------------
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* Initialization and Cleanup
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*/
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struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
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{
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struct vsp1_uds *uds;
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char name[6];
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int ret;
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uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
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if (uds == NULL)
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return ERR_PTR(-ENOMEM);
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uds->entity.ops = &uds_entity_ops;
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uds->entity.type = VSP1_ENTITY_UDS;
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uds->entity.index = index;
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sprintf(name, "uds.%u", index);
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ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,
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MEDIA_ENT_F_PROC_VIDEO_SCALER);
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if (ret < 0)
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return ERR_PTR(ret);
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return uds;
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}
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