drivers/media/platform/vsp1/vsp1_uds.c

   1 /*
   2  * vsp1_uds.c  --  R-Car VSP1 Up and Down Scaler
   3  *
   4  * Copyright (C) 2013-2014 Renesas Electronics Corporation
   5  *
   6  * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/gfp.h>
  16
  17 #include <media/v4l2-subdev.h>
  18
  19 #include "vsp1.h"
  20 #include "vsp1_dl.h"
  21 #include "vsp1_pipe.h"
  22 #include "vsp1_uds.h"
  23
  24 #define UDS_MIN_SIZE                            4U
  25 #define UDS_MAX_SIZE                            8190U
  26
  27 #define UDS_MIN_FACTOR                          0x0100
  28 #define UDS_MAX_FACTOR                          0xffff
  29
  30 /* -----------------------------------------------------------------------------
  31  * Device Access
  32  */
  33
  34 static inline void vsp1_uds_write(struct vsp1_uds *uds, struct vsp1_dl_list *dl,
  35                                   u32 reg, u32 data)
  36 {
  37         vsp1_dl_list_write(dl, reg + uds->entity.index * VI6_UDS_OFFSET, data);
  38 }
  39
  40 /* -----------------------------------------------------------------------------
  41  * Scaling Computation
  42  */
  43
  44 void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_list *dl,
  45                         unsigned int alpha)
  46 {
  47         struct vsp1_uds *uds = to_uds(&entity->subdev);
  48
  49         vsp1_uds_write(uds, dl, VI6_UDS_ALPVAL,
  50                        alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
  51 }
  52
  53 /*
  54  * uds_output_size - Return the output size for an input size and scaling ratio
  55  * @input: input size in pixels
  56  * @ratio: scaling ratio in U4.12 fixed-point format
  57  */
  58 static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
  59 {
  60         if (ratio > 4096) {
  61                 /* Down-scaling */
  62                 unsigned int mp;
  63
  64                 mp = ratio / 4096;
  65                 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
  66
  67                 return (input - 1) / mp * mp * 4096 / ratio + 1;
  68         } else {
  69                 /* Up-scaling */
  70                 return (input - 1) * 4096 / ratio + 1;
  71         }
  72 }
  73
  74 /*
  75  * uds_output_limits - Return the min and max output sizes for an input size
  76  * @input: input size in pixels
  77  * @minimum: minimum output size (returned)
  78  * @maximum: maximum output size (returned)
  79  */
  80 static void uds_output_limits(unsigned int input,
  81                               unsigned int *minimum, unsigned int *maximum)
  82 {
  83         *minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE);
  84         *maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE);
  85 }
  86
  87 /*
  88  * uds_passband_width - Return the passband filter width for a scaling ratio
  89  * @ratio: scaling ratio in U4.12 fixed-point format
  90  */
  91 static unsigned int uds_passband_width(unsigned int ratio)
  92 {
  93         if (ratio >= 4096) {
  94                 /* Down-scaling */
  95                 unsigned int mp;
  96
  97                 mp = ratio / 4096;
  98                 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
  99
 100                 return 64 * 4096 * mp / ratio;
 101         } else {
 102                 /* Up-scaling */
 103                 return 64;
 104         }
 105 }
 106
 107 static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
 108 {
 109         /* TODO: This is an approximation that will need to be refined. */
 110         return (input - 1) * 4096 / (output - 1);
 111 }
 112
 113 /* -----------------------------------------------------------------------------
 114  * V4L2 Subdevice Pad Operations
 115  */
 116
 117 static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
 118                               struct v4l2_subdev_pad_config *cfg,
 119                               struct v4l2_subdev_mbus_code_enum *code)
 120 {
 121         static const unsigned int codes[] = {
 122                 MEDIA_BUS_FMT_ARGB8888_1X32,
 123                 MEDIA_BUS_FMT_AYUV8_1X32,
 124         };
 125
 126         return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
 127                                           ARRAY_SIZE(codes));
 128 }
 129
 130 static int uds_enum_frame_size(struct v4l2_subdev *subdev,
 131                                struct v4l2_subdev_pad_config *cfg,
 132                                struct v4l2_subdev_frame_size_enum *fse)
 133 {
 134         struct vsp1_uds *uds = to_uds(subdev);
 135         struct v4l2_subdev_pad_config *config;
 136         struct v4l2_mbus_framefmt *format;
 137         int ret = 0;
 138
 139         config = vsp1_entity_get_pad_config(&uds->entity, cfg, fse->which);
 140         if (!config)
 141                 return -EINVAL;
 142
 143         format = vsp1_entity_get_pad_format(&uds->entity, config,
 144                                             UDS_PAD_SINK);
 145
 146         mutex_lock(&uds->entity.lock);
 147
 148         if (fse->index || fse->code != format->code) {
 149                 ret = -EINVAL;
 150                 goto done;
 151         }
 152
 153         if (fse->pad == UDS_PAD_SINK) {
 154                 fse->min_width = UDS_MIN_SIZE;
 155                 fse->max_width = UDS_MAX_SIZE;
 156                 fse->min_height = UDS_MIN_SIZE;
 157                 fse->max_height = UDS_MAX_SIZE;
 158         } else {
 159                 uds_output_limits(format->width, &fse->min_width,
 160                                   &fse->max_width);
 161                 uds_output_limits(format->height, &fse->min_height,
 162                                   &fse->max_height);
 163         }
 164
 165 done:
 166         mutex_unlock(&uds->entity.lock);
 167         return ret;
 168 }
 169
 170 static void uds_try_format(struct vsp1_uds *uds,
 171                            struct v4l2_subdev_pad_config *config,
 172                            unsigned int pad, struct v4l2_mbus_framefmt *fmt)
 173 {
 174         struct v4l2_mbus_framefmt *format;
 175         unsigned int minimum;
 176         unsigned int maximum;
 177
 178         switch (pad) {
 179         case UDS_PAD_SINK:
 180                 /* Default to YUV if the requested format is not supported. */
 181                 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
 182                     fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
 183                         fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
 184
 185                 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
 186                 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
 187                 break;
 188
 189         case UDS_PAD_SOURCE:
 190                 /* The UDS scales but can't perform format conversion. */
 191                 format = vsp1_entity_get_pad_format(&uds->entity, config,
 192                                                     UDS_PAD_SINK);
 193                 fmt->code = format->code;
 194
 195                 uds_output_limits(format->width, &minimum, &maximum);
 196                 fmt->width = clamp(fmt->width, minimum, maximum);
 197                 uds_output_limits(format->height, &minimum, &maximum);
 198                 fmt->height = clamp(fmt->height, minimum, maximum);
 199                 break;
 200         }
 201
 202         fmt->field = V4L2_FIELD_NONE;
 203         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 204 }
 205
 206 static int uds_set_format(struct v4l2_subdev *subdev,
 207                           struct v4l2_subdev_pad_config *cfg,
 208                           struct v4l2_subdev_format *fmt)
 209 {
 210         struct vsp1_uds *uds = to_uds(subdev);
 211         struct v4l2_subdev_pad_config *config;
 212         struct v4l2_mbus_framefmt *format;
 213         int ret = 0;
 214
 215         mutex_lock(&uds->entity.lock);
 216
 217         config = vsp1_entity_get_pad_config(&uds->entity, cfg, fmt->which);
 218         if (!config) {
 219                 ret = -EINVAL;
 220                 goto done;
 221         }
 222
 223         uds_try_format(uds, config, fmt->pad, &fmt->format);
 224
 225         format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad);
 226         *format = fmt->format;
 227
 228         if (fmt->pad == UDS_PAD_SINK) {
 229                 /* Propagate the format to the source pad. */
 230                 format = vsp1_entity_get_pad_format(&uds->entity, config,
 231                                                     UDS_PAD_SOURCE);
 232                 *format = fmt->format;
 233
 234                 uds_try_format(uds, config, UDS_PAD_SOURCE, format);
 235         }
 236
 237 done:
 238         mutex_unlock(&uds->entity.lock);
 239         return ret;
 240 }
 241
 242 /* -----------------------------------------------------------------------------
 243  * V4L2 Subdevice Operations
 244  */
 245
 246 static const struct v4l2_subdev_pad_ops uds_pad_ops = {
 247         .init_cfg = vsp1_entity_init_cfg,
 248         .enum_mbus_code = uds_enum_mbus_code,
 249         .enum_frame_size = uds_enum_frame_size,
 250         .get_fmt = vsp1_subdev_get_pad_format,
 251         .set_fmt = uds_set_format,
 252 };
 253
 254 static const struct v4l2_subdev_ops uds_ops = {
 255         .pad    = &uds_pad_ops,
 256 };
 257
 258 /* -----------------------------------------------------------------------------
 259  * VSP1 Entity Operations
 260  */
 261
 262 static void uds_configure(struct vsp1_entity *entity,
 263                           struct vsp1_pipeline *pipe,
 264                           struct vsp1_dl_list *dl,
 265                           enum vsp1_entity_params params)
 266 {
 267         struct vsp1_uds *uds = to_uds(&entity->subdev);
 268         const struct v4l2_mbus_framefmt *output;
 269         const struct v4l2_mbus_framefmt *input;
 270         unsigned int hscale;
 271         unsigned int vscale;
 272         bool multitap;
 273
 274         if (params == VSP1_ENTITY_PARAMS_PARTITION) {
 275                 const struct v4l2_rect *clip = &pipe->partition;
 276
 277                 vsp1_uds_write(uds, dl, VI6_UDS_CLIP_SIZE,
 278                                (clip->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
 279                                (clip->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
 280                 return;
 281         }
 282
 283         if (params != VSP1_ENTITY_PARAMS_INIT)
 284                 return;
 285
 286         input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 287                                            UDS_PAD_SINK);
 288         output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 289                                             UDS_PAD_SOURCE);
 290
 291         hscale = uds_compute_ratio(input->width, output->width);
 292         vscale = uds_compute_ratio(input->height, output->height);
 293
 294         dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);
 295
 296         /* Multi-tap scaling can't be enabled along with alpha scaling when
 297          * scaling down with a factor lower than or equal to 1/2 in either
 298          * direction.
 299          */
 300         if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))
 301                 multitap = false;
 302         else
 303                 multitap = true;
 304
 305         vsp1_uds_write(uds, dl, VI6_UDS_CTRL,
 306                        (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
 307                        (multitap ? VI6_UDS_CTRL_BC : 0));
 308
 309         vsp1_uds_write(uds, dl, VI6_UDS_PASS_BWIDTH,
 310                        (uds_passband_width(hscale)
 311                                 << VI6_UDS_PASS_BWIDTH_H_SHIFT) |
 312                        (uds_passband_width(vscale)
 313                                 << VI6_UDS_PASS_BWIDTH_V_SHIFT));
 314
 315         /* Set the scaling ratios. */
 316         vsp1_uds_write(uds, dl, VI6_UDS_SCALE,
 317                        (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
 318                        (vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
 319 }
 320
 321 static unsigned int uds_max_width(struct vsp1_entity *entity,
 322                                   struct vsp1_pipeline *pipe)
 323 {
 324         struct vsp1_uds *uds = to_uds(&entity->subdev);
 325         const struct v4l2_mbus_framefmt *output;
 326         const struct v4l2_mbus_framefmt *input;
 327         unsigned int hscale;
 328
 329         input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 330                                            UDS_PAD_SINK);
 331         output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
 332                                             UDS_PAD_SOURCE);
 333         hscale = output->width / input->width;
 334
 335         if (hscale <= 2)
 336                 return 256;
 337         else if (hscale <= 4)
 338                 return 512;
 339         else if (hscale <= 8)
 340                 return 1024;
 341         else
 342                 return 2048;
 343 }
 344
 345 static const struct vsp1_entity_operations uds_entity_ops = {
 346         .configure = uds_configure,
 347         .max_width = uds_max_width,
 348 };
 349
 350 /* -----------------------------------------------------------------------------
 351  * Initialization and Cleanup
 352  */
 353
 354 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
 355 {
 356         struct vsp1_uds *uds;
 357         char name[6];
 358         int ret;
 359
 360         uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
 361         if (uds == NULL)
 362                 return ERR_PTR(-ENOMEM);
 363
 364         uds->entity.ops = &uds_entity_ops;
 365         uds->entity.type = VSP1_ENTITY_UDS;
 366         uds->entity.index = index;
 367
 368         sprintf(name, "uds.%u", index);
 369         ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,
 370                                MEDIA_ENT_F_PROC_VIDEO_SCALER);
 371         if (ret < 0)
 372                 return ERR_PTR(ret);
 373
 374         return uds;
 375 }