LXR linux/drivers/media/platform/vsp1/vsp1

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * vsp1_uds.c  --  R-Car VSP1 Up and Down Scaler
   4 *
   5 * Copyright (C) 2013-2014 Renesas Electronics Corporation
   6 *
   7 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   8 */
   9
  10#include <linux/device.h>
  11#include <linux/gfp.h>
  12
  13#include <media/v4l2-subdev.h>
  14
  15#include "vsp1.h"
  16#include "vsp1_dl.h"
  17#include "vsp1_pipe.h"
  18#include "vsp1_uds.h"
  19
  20#define UDS_MIN_SIZE                            4U
  21#define UDS_MAX_SIZE                            8190U
  22
  23#define UDS_MIN_FACTOR                          0x0100
  24#define UDS_MAX_FACTOR                          0xffff
  25
  26/* -----------------------------------------------------------------------------
  27 * Device Access
  28 */
  29
  30static inline void vsp1_uds_write(struct vsp1_uds *uds,
  31                                  struct vsp1_dl_body *dlb, u32 reg, u32 data)
  32{
  33        vsp1_dl_body_write(dlb, reg + uds->entity.index * VI6_UDS_OFFSET, data);
  34}
  35
  36/* -----------------------------------------------------------------------------
  37 * Scaling Computation
  38 */
  39
  40void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_body *dlb,
  41                        unsigned int alpha)
  42{
  43        struct vsp1_uds *uds = to_uds(&entity->subdev);
  44
  45        vsp1_uds_write(uds, dlb, VI6_UDS_ALPVAL,
  46                       alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
  47}
  48
  49/*
  50 * uds_output_size - Return the output size for an input size and scaling ratio
  51 * @input: input size in pixels
  52 * @ratio: scaling ratio in U4.12 fixed-point format
  53 */
  54static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
  55{
  56        if (ratio > 4096) {
  57                /* Down-scaling */
  58                unsigned int mp;
  59
  60                mp = ratio / 4096;
  61                mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
  62
  63                return (input - 1) / mp * mp * 4096 / ratio + 1;
  64        } else {
  65                /* Up-scaling */
  66                return (input - 1) * 4096 / ratio + 1;
  67        }
  68}
  69
  70/*
  71 * uds_output_limits - Return the min and max output sizes for an input size
  72 * @input: input size in pixels
  73 * @minimum: minimum output size (returned)
  74 * @maximum: maximum output size (returned)
  75 */
  76static void uds_output_limits(unsigned int input,
  77                              unsigned int *minimum, unsigned int *maximum)
  78{
  79        *minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE);
  80        *maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE);
  81}
  82
  83/*
  84 * uds_passband_width - Return the passband filter width for a scaling ratio
  85 * @ratio: scaling ratio in U4.12 fixed-point format
  86 */
  87static unsigned int uds_passband_width(unsigned int ratio)
  88{
  89        if (ratio >= 4096) {
  90                /* Down-scaling */
  91                unsigned int mp;
  92
  93                mp = ratio / 4096;
  94                mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
  95
  96                return 64 * 4096 * mp / ratio;
  97        } else {
  98                /* Up-scaling */
  99                return 64;
 100        }
 101}
 102
 103static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
 104{
 105        /* TODO: This is an approximation that will need to be refined. */
 106        return (input - 1) * 4096 / (output - 1);
 107}
 108
 109/* -----------------------------------------------------------------------------
 110 * V4L2 Subdevice Pad Operations
 111 */
 112
 113static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
 114                              struct v4l2_subdev_state *sd_state,
 115                              struct v4l2_subdev_mbus_code_enum *code)
 116{
 117        static const unsigned int codes[] = {
 118                MEDIA_BUS_FMT_ARGB8888_1X32,
 119                MEDIA_BUS_FMT_AYUV8_1X32,
 120        };
 121
 122        return vsp1_subdev_enum_mbus_code(subdev, sd_state, code, codes,
 123                                          ARRAY_SIZE(codes));
 124}
 125
 126static int uds_enum_frame_size(struct v4l2_subdev *subdev,
 127                               struct v4l2_subdev_state *sd_state,
 128                               struct v4l2_subdev_frame_size_enum *fse)
 129{
 130        struct vsp1_uds *uds = to_uds(subdev);
 131        struct v4l2_subdev_state *config;
 132        struct v4l2_mbus_framefmt *format;
 133        int ret = 0;
 134
 135        config = vsp1_entity_get_pad_config(&uds->entity, sd_state,
 136                                            fse->which);
 137        if (!config)
 138                return -EINVAL;
 139
 140        format = vsp1_entity_get_pad_format(&uds->entity, config,
 141                                            UDS_PAD_SINK);
 142
 143        mutex_lock(&uds->entity.lock);
 144
 145        if (fse->index || fse->code != format->code) {
 146                ret = -EINVAL;
 147                goto done;
 148        }
 149
 150        if (fse->pad == UDS_PAD_SINK) {
 151                fse->min_width = UDS_MIN_SIZE;
 152                fse->max_width = UDS_MAX_SIZE;
 153                fse->min_height = UDS_MIN_SIZE;
 154                fse->max_height = UDS_MAX_SIZE;
 155        } else {
 156                uds_output_limits(format->width, &fse->min_width,
 157                                  &fse->max_width);
 158                uds_output_limits(format->height, &fse->min_height,
 159                                  &fse->max_height);
 160        }
 161
 162done:
 163        mutex_unlock(&uds->entity.lock);
 164        return ret;
 165}
 166
 167static void uds_try_format(struct vsp1_uds *uds,
 168                           struct v4l2_subdev_state *sd_state,
 169                           unsigned int pad, struct v4l2_mbus_framefmt *fmt)
 170{
 171        struct v4l2_mbus_framefmt *format;
 172        unsigned int minimum;
 173        unsigned int maximum;
 174
 175        switch (pad) {
 176        case UDS_PAD_SINK:
 177                /* Default to YUV if the requested format is not supported. */
 178                if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
 179                    fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
 180                        fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
 181
 182                fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
 183                fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
 184                break;
 185
 186        case UDS_PAD_SOURCE:
 187                /* The UDS scales but can't perform format conversion. */
 188                format = vsp1_entity_get_pad_format(&uds->entity, sd_state,
 189                                                    UDS_PAD_SINK);
 190                fmt->code = format->code;
 191
 192                uds_output_limits(format->width, &minimum, &maximum);
 193                fmt->width = clamp(fmt->width, minimum, maximum);
 194                uds_output_limits(format->height, &minimum, &maximum);
 195                fmt->height = clamp(fmt->height, minimum, maximum);
 196                break;
 197        }
 198
 199        fmt->field = V4L2_FIELD_NONE;
 200        fmt->colorspace = V4L2_COLORSPACE_SRGB;
 201}
 202
 203static int uds_set_format(struct v4l2_subdev *subdev,
 204                          struct v4l2_subdev_state *sd_state,
 205                          struct v4l2_subdev_format *fmt)
 206{
 207        struct vsp1_uds *uds = to_uds(subdev);
 208        struct v4l2_subdev_state *config;
 209        struct v4l2_mbus_framefmt *format;
 210        int ret = 0;
 211
 212        mutex_lock(&uds->entity.lock);
 213
 214        config = vsp1_entity_get_pad_config(&uds->entity, sd_state,
 215                                            fmt->which);
 216        if (!config) {
 217                ret = -EINVAL;
 218                goto done;
 219        }
 220
 221        uds_try_format(uds, config, fmt->pad, &fmt->format);
 222
 223        format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad);
 224        *format = fmt->format;
 225
 226        if (fmt->pad == UDS_PAD_SINK) {
 227                /* Propagate the format to the source pad. */
 228                format = vsp1_entity_get_pad_format(&uds->entity, config,
 229                                                    UDS_PAD_SOURCE);
 230                *format = fmt->format;
 231
 232                uds_try_format(uds, config, UDS_PAD_SOURCE, format);
 233        }
 234
 235done:
 236        mutex_unlock(&uds->entity.lock);
 237        return ret;
 238}
 239
 240/* -----------------------------------------------------------------------------
 241 * V4L2 Subdevice Operations
 242 */
 243
 244static const struct v4l2_subdev_pad_ops uds_pad_ops = {
 245        .init_cfg = vsp1_entity_init_cfg,
 246        .enum_mbus_code = uds_enum_mbus_code,
 247        .enum_frame_size = uds_enum_frame_size,
 248        .get_fmt = vsp1_subdev_get_pad_format,
 249        .set_fmt = uds_set_format,
 250};
 251
 252static const struct v4l2_subdev_ops uds_ops = {
 253        .pad    = &uds_pad_ops,
 254};
 255
 256/* -----------------------------------------------------------------------------
 257 * VSP1 Entity Operations
 258 */
 259
 260static void uds_configure_stream(struct vsp1_entity *entity,
 261                                 struct vsp1_pipeline *pipe,
 262                                 struct vsp1_dl_list *dl,
 263                                 struct vsp1_dl_body *dlb)
 264{
 265        struct vsp1_uds *uds = to_uds(&entity->subdev);
 266        const struct v4l2_mbus_framefmt *output;
 267        const struct v4l2_mbus_framefmt *input;
 268        unsigned int hscale;
 269        unsigned int vscale;
 270        bool multitap;
 271
 272        input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 273                                           UDS_PAD_SINK);
 274        output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 275                                            UDS_PAD_SOURCE);
 276
 277        hscale = uds_compute_ratio(input->width, output->width);
 278        vscale = uds_compute_ratio(input->height, output->height);
 279
 280        dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);
 281
 282        /*
 283         * Multi-tap scaling can't be enabled along with alpha scaling when
 284         * scaling down with a factor lower than or equal to 1/2 in either
 285         * direction.
 286         */
 287        if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))
 288                multitap = false;
 289        else
 290                multitap = true;
 291
 292        vsp1_uds_write(uds, dlb, VI6_UDS_CTRL,
 293                       (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
 294                       (multitap ? VI6_UDS_CTRL_BC : 0));
 295
 296        vsp1_uds_write(uds, dlb, VI6_UDS_PASS_BWIDTH,
 297                       (uds_passband_width(hscale)
 298                                << VI6_UDS_PASS_BWIDTH_H_SHIFT) |
 299                       (uds_passband_width(vscale)
 300                                << VI6_UDS_PASS_BWIDTH_V_SHIFT));
 301
 302        /* Set the scaling ratios. */
 303        vsp1_uds_write(uds, dlb, VI6_UDS_SCALE,
 304                       (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
 305                       (vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
 306}
 307
 308static void uds_configure_partition(struct vsp1_entity *entity,
 309                                    struct vsp1_pipeline *pipe,
 310                                    struct vsp1_dl_list *dl,
 311                                    struct vsp1_dl_body *dlb)
 312{
 313        struct vsp1_uds *uds = to_uds(&entity->subdev);
 314        struct vsp1_partition *partition = pipe->partition;
 315        const struct v4l2_mbus_framefmt *output;
 316
 317        output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 318                                            UDS_PAD_SOURCE);
 319
 320        /* Input size clipping. */
 321        vsp1_uds_write(uds, dlb, VI6_UDS_HSZCLIP, VI6_UDS_HSZCLIP_HCEN |
 322                       (0 << VI6_UDS_HSZCLIP_HCL_OFST_SHIFT) |
 323                       (partition->uds_sink.width
 324                                << VI6_UDS_HSZCLIP_HCL_SIZE_SHIFT));
 325
 326        /* Output size clipping. */
 327        vsp1_uds_write(uds, dlb, VI6_UDS_CLIP_SIZE,
 328                       (partition->uds_source.width
 329                                << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
 330                       (output->height
 331                                << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
 332}
 333
 334static unsigned int uds_max_width(struct vsp1_entity *entity,
 335                                  struct vsp1_pipeline *pipe)
 336{
 337        struct vsp1_uds *uds = to_uds(&entity->subdev);
 338        const struct v4l2_mbus_framefmt *output;
 339        const struct v4l2_mbus_framefmt *input;
 340        unsigned int hscale;
 341
 342        input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 343                                           UDS_PAD_SINK);
 344        output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 345                                            UDS_PAD_SOURCE);
 346        hscale = output->width / input->width;
 347
 348        /*
 349         * The maximum width of the UDS is 304 pixels. These are input pixels
 350         * in the event of up-scaling, and output pixels in the event of
 351         * downscaling.
 352         *
 353         * To support overlapping partition windows we clamp at units of 256 and
 354         * the remaining pixels are reserved.
 355         */
 356        if (hscale <= 2)
 357                return 256;
 358        else if (hscale <= 4)
 359                return 512;
 360        else if (hscale <= 8)
 361                return 1024;
 362        else
 363                return 2048;
 364}
 365
 366/* -----------------------------------------------------------------------------
 367 * Partition Algorithm Support
 368 */
 369
 370static void uds_partition(struct vsp1_entity *entity,
 371                          struct vsp1_pipeline *pipe,
 372                          struct vsp1_partition *partition,
 373                          unsigned int partition_idx,
 374                          struct vsp1_partition_window *window)
 375{
 376        struct vsp1_uds *uds = to_uds(&entity->subdev);
 377        const struct v4l2_mbus_framefmt *output;
 378        const struct v4l2_mbus_framefmt *input;
 379
 380        /* Initialise the partition state. */
 381        partition->uds_sink = *window;
 382        partition->uds_source = *window;
 383
 384        input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 385                                           UDS_PAD_SINK);
 386        output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 387                                            UDS_PAD_SOURCE);
 388
 389        partition->uds_sink.width = window->width * input->width
 390                                  / output->width;
 391        partition->uds_sink.left = window->left * input->width
 392                                 / output->width;
 393
 394        *window = partition->uds_sink;
 395}
 396
 397static const struct vsp1_entity_operations uds_entity_ops = {
 398        .configure_stream = uds_configure_stream,
 399        .configure_partition = uds_configure_partition,
 400        .max_width = uds_max_width,
 401        .partition = uds_partition,
 402};
 403
 404/* -----------------------------------------------------------------------------
 405 * Initialization and Cleanup
 406 */
 407
 408struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
 409{
 410        struct vsp1_uds *uds;
 411        char name[6];
 412        int ret;
 413
 414        uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
 415        if (uds == NULL)
 416                return ERR_PTR(-ENOMEM);
 417
 418        uds->entity.ops = &uds_entity_ops;
 419        uds->entity.type = VSP1_ENTITY_UDS;
 420        uds->entity.index = index;
 421
 422        sprintf(name, "uds.%u", index);
 423        ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,
 424                               MEDIA_ENT_F_PROC_VIDEO_SCALER);
 425        if (ret < 0)
 426                return ERR_PTR(ret);
 427
 428        return uds;
 429}
 430