drivers/media/platform/vsp1/vsp1_uds.c

   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
  30 static 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
  40 void 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  */
  54 static 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  */
  76 static 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  */
  87 static 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
 103 static 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
 113 static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
 114                               struct v4l2_subdev_pad_config *cfg,
 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, cfg, code, codes,
 123                                           ARRAY_SIZE(codes));
 124 }
 125
 126 static int uds_enum_frame_size(struct v4l2_subdev *subdev,
 127                                struct v4l2_subdev_pad_config *cfg,
 128                                struct v4l2_subdev_frame_size_enum *fse)
 129 {
 130         struct vsp1_uds *uds = to_uds(subdev);
 131         struct v4l2_subdev_pad_config *config;
 132         struct v4l2_mbus_framefmt *format;
 133         int ret = 0;
 134
 135         config = vsp1_entity_get_pad_config(&uds->entity, cfg, fse->which);
 136         if (!config)
 137                 return -EINVAL;
 138
 139         format = vsp1_entity_get_pad_format(&uds->entity, config,
 140                                             UDS_PAD_SINK);
 141
 142         mutex_lock(&uds->entity.lock);
 143
 144         if (fse->index || fse->code != format->code) {
 145                 ret = -EINVAL;
 146                 goto done;
 147         }
 148
 149         if (fse->pad == UDS_PAD_SINK) {
 150                 fse->min_width = UDS_MIN_SIZE;
 151                 fse->max_width = UDS_MAX_SIZE;
 152                 fse->min_height = UDS_MIN_SIZE;
 153                 fse->max_height = UDS_MAX_SIZE;
 154         } else {
 155                 uds_output_limits(format->width, &fse->min_width,
 156                                   &fse->max_width);
 157                 uds_output_limits(format->height, &fse->min_height,
 158                                   &fse->max_height);
 159         }
 160
 161 done:
 162         mutex_unlock(&uds->entity.lock);
 163         return ret;
 164 }
 165
 166 static void uds_try_format(struct vsp1_uds *uds,
 167                            struct v4l2_subdev_pad_config *config,
 168                            unsigned int pad, struct v4l2_mbus_framefmt *fmt)
 169 {
 170         struct v4l2_mbus_framefmt *format;
 171         unsigned int minimum;
 172         unsigned int maximum;
 173
 174         switch (pad) {
 175         case UDS_PAD_SINK:
 176                 /* Default to YUV if the requested format is not supported. */
 177                 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
 178                     fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
 179                         fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
 180
 181                 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
 182                 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
 183                 break;
 184
 185         case UDS_PAD_SOURCE:
 186                 /* The UDS scales but can't perform format conversion. */
 187                 format = vsp1_entity_get_pad_format(&uds->entity, config,
 188                                                     UDS_PAD_SINK);
 189                 fmt->code = format->code;
 190
 191                 uds_output_limits(format->width, &minimum, &maximum);
 192                 fmt->width = clamp(fmt->width, minimum, maximum);
 193                 uds_output_limits(format->height, &minimum, &maximum);
 194                 fmt->height = clamp(fmt->height, minimum, maximum);
 195                 break;
 196         }
 197
 198         fmt->field = V4L2_FIELD_NONE;
 199         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 200 }
 201
 202 static int uds_set_format(struct v4l2_subdev *subdev,
 203                           struct v4l2_subdev_pad_config *cfg,
 204                           struct v4l2_subdev_format *fmt)
 205 {
 206         struct vsp1_uds *uds = to_uds(subdev);
 207         struct v4l2_subdev_pad_config *config;
 208         struct v4l2_mbus_framefmt *format;
 209         int ret = 0;
 210
 211         mutex_lock(&uds->entity.lock);
 212
 213         config = vsp1_entity_get_pad_config(&uds->entity, cfg, fmt->which);
 214         if (!config) {
 215                 ret = -EINVAL;
 216                 goto done;
 217         }
 218
 219         uds_try_format(uds, config, fmt->pad, &fmt->format);
 220
 221         format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad);
 222         *format = fmt->format;
 223
 224         if (fmt->pad == UDS_PAD_SINK) {
 225                 /* Propagate the format to the source pad. */
 226                 format = vsp1_entity_get_pad_format(&uds->entity, config,
 227                                                     UDS_PAD_SOURCE);
 228                 *format = fmt->format;
 229
 230                 uds_try_format(uds, config, UDS_PAD_SOURCE, format);
 231         }
 232
 233 done:
 234         mutex_unlock(&uds->entity.lock);
 235         return ret;
 236 }
 237
 238 /* -----------------------------------------------------------------------------
 239  * V4L2 Subdevice Operations
 240  */
 241
 242 static const struct v4l2_subdev_pad_ops uds_pad_ops = {
 243         .init_cfg = vsp1_entity_init_cfg,
 244         .enum_mbus_code = uds_enum_mbus_code,
 245         .enum_frame_size = uds_enum_frame_size,
 246         .get_fmt = vsp1_subdev_get_pad_format,
 247         .set_fmt = uds_set_format,
 248 };
 249
 250 static const struct v4l2_subdev_ops uds_ops = {
 251         .pad    = &uds_pad_ops,
 252 };
 253
 254 /* -----------------------------------------------------------------------------
 255  * VSP1 Entity Operations
 256  */
 257
 258 static void uds_configure_stream(struct vsp1_entity *entity,
 259                                  struct vsp1_pipeline *pipe,
 260                                  struct vsp1_dl_body *dlb)
 261 {
 262         struct vsp1_uds *uds = to_uds(&entity->subdev);
 263         const struct v4l2_mbus_framefmt *output;
 264         const struct v4l2_mbus_framefmt *input;
 265         unsigned int hscale;
 266         unsigned int vscale;
 267         bool multitap;
 268
 269         input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 270                                            UDS_PAD_SINK);
 271         output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 272                                             UDS_PAD_SOURCE);
 273
 274         hscale = uds_compute_ratio(input->width, output->width);
 275         vscale = uds_compute_ratio(input->height, output->height);
 276
 277         dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);
 278
 279         /*
 280          * Multi-tap scaling can't be enabled along with alpha scaling when
 281          * scaling down with a factor lower than or equal to 1/2 in either
 282          * direction.
 283          */
 284         if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))
 285                 multitap = false;
 286         else
 287                 multitap = true;
 288
 289         vsp1_uds_write(uds, dlb, VI6_UDS_CTRL,
 290                        (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
 291                        (multitap ? VI6_UDS_CTRL_BC : 0));
 292
 293         vsp1_uds_write(uds, dlb, VI6_UDS_PASS_BWIDTH,
 294                        (uds_passband_width(hscale)
 295                                 << VI6_UDS_PASS_BWIDTH_H_SHIFT) |
 296                        (uds_passband_width(vscale)
 297                                 << VI6_UDS_PASS_BWIDTH_V_SHIFT));
 298
 299         /* Set the scaling ratios. */
 300         vsp1_uds_write(uds, dlb, VI6_UDS_SCALE,
 301                        (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
 302                        (vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
 303 }
 304
 305 static void uds_configure_partition(struct vsp1_entity *entity,
 306                                     struct vsp1_pipeline *pipe,
 307                                     struct vsp1_dl_list *dl,
 308                                     struct vsp1_dl_body *dlb)
 309 {
 310         struct vsp1_uds *uds = to_uds(&entity->subdev);
 311         struct vsp1_partition *partition = pipe->partition;
 312         const struct v4l2_mbus_framefmt *output;
 313
 314         output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 315                                             UDS_PAD_SOURCE);
 316
 317         /* Input size clipping */
 318         vsp1_uds_write(uds, dlb, VI6_UDS_HSZCLIP, VI6_UDS_HSZCLIP_HCEN |
 319                        (0 << VI6_UDS_HSZCLIP_HCL_OFST_SHIFT) |
 320                        (partition->uds_sink.width
 321                                 << VI6_UDS_HSZCLIP_HCL_SIZE_SHIFT));
 322
 323         /* Output size clipping */
 324         vsp1_uds_write(uds, dlb, VI6_UDS_CLIP_SIZE,
 325                        (partition->uds_source.width
 326                                 << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
 327                        (output->height
 328                                 << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
 329 }
 330
 331 static unsigned int uds_max_width(struct vsp1_entity *entity,
 332                                   struct vsp1_pipeline *pipe)
 333 {
 334         struct vsp1_uds *uds = to_uds(&entity->subdev);
 335         const struct v4l2_mbus_framefmt *output;
 336         const struct v4l2_mbus_framefmt *input;
 337         unsigned int hscale;
 338
 339         input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 340                                            UDS_PAD_SINK);
 341         output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 342                                             UDS_PAD_SOURCE);
 343         hscale = output->width / input->width;
 344
 345         if (hscale <= 2)
 346                 return 256;
 347         else if (hscale <= 4)
 348                 return 512;
 349         else if (hscale <= 8)
 350                 return 1024;
 351         else
 352                 return 2048;
 353 }
 354
 355 /* -----------------------------------------------------------------------------
 356  * Partition Algorithm Support
 357  */
 358
 359 static void uds_partition(struct vsp1_entity *entity,
 360                           struct vsp1_pipeline *pipe,
 361                           struct vsp1_partition *partition,
 362                           unsigned int partition_idx,
 363                           struct vsp1_partition_window *window)
 364 {
 365         struct vsp1_uds *uds = to_uds(&entity->subdev);
 366         const struct v4l2_mbus_framefmt *output;
 367         const struct v4l2_mbus_framefmt *input;
 368
 369         /* Initialise the partition state */
 370         partition->uds_sink = *window;
 371         partition->uds_source = *window;
 372
 373         input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 374                                            UDS_PAD_SINK);
 375         output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 376                                             UDS_PAD_SOURCE);
 377
 378         partition->uds_sink.width = window->width * input->width
 379                                   / output->width;
 380         partition->uds_sink.left = window->left * input->width
 381                                  / output->width;
 382
 383         *window = partition->uds_sink;
 384 }
 385
 386 static const struct vsp1_entity_operations uds_entity_ops = {
 387         .configure_stream = uds_configure_stream,
 388         .configure_partition = uds_configure_partition,
 389         .max_width = uds_max_width,
 390         .partition = uds_partition,
 391 };
 392
 393 /* -----------------------------------------------------------------------------
 394  * Initialization and Cleanup
 395  */
 396
 397 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
 398 {
 399         struct vsp1_uds *uds;
 400         char name[6];
 401         int ret;
 402
 403         uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
 404         if (uds == NULL)
 405                 return ERR_PTR(-ENOMEM);
 406
 407         uds->entity.ops = &uds_entity_ops;
 408         uds->entity.type = VSP1_ENTITY_UDS;
 409         uds->entity.index = index;
 410
 411         sprintf(name, "uds.%u", index);
 412         ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,
 413                                MEDIA_ENT_F_PROC_VIDEO_SCALER);
 414         if (ret < 0)
 415                 return ERR_PTR(ret);
 416
 417         return uds;
 418 }