drivers/media/platform/vsp1/vsp1_sru.c

   1 /*
   2  * vsp1_sru.c  --  R-Car VSP1 Super Resolution Unit
   3  *
   4  * Copyright (C) 2013 Renesas 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_sru.h"
  21
  22 #define SRU_MIN_SIZE                            4U
  23 #define SRU_MAX_SIZE                            8190U
  24
  25 /* -----------------------------------------------------------------------------
  26  * Device Access
  27  */
  28
  29 static inline void vsp1_sru_write(struct vsp1_sru *sru, u32 reg, u32 data)
  30 {
  31         vsp1_mod_write(&sru->entity, reg, data);
  32 }
  33
  34 /* -----------------------------------------------------------------------------
  35  * Controls
  36  */
  37
  38 #define V4L2_CID_VSP1_SRU_INTENSITY             (V4L2_CID_USER_BASE + 1)
  39
  40 struct vsp1_sru_param {
  41         u32 ctrl0;
  42         u32 ctrl2;
  43 };
  44
  45 #define VI6_SRU_CTRL0_PARAMS(p0, p1)                    \
  46         (((p0) << VI6_SRU_CTRL0_PARAM0_SHIFT) |         \
  47          ((p1) << VI6_SRU_CTRL0_PARAM1_SHIFT))
  48
  49 #define VI6_SRU_CTRL2_PARAMS(p6, p7, p8)                \
  50         (((p6) << VI6_SRU_CTRL2_PARAM6_SHIFT) |         \
  51          ((p7) << VI6_SRU_CTRL2_PARAM7_SHIFT) |         \
  52          ((p8) << VI6_SRU_CTRL2_PARAM8_SHIFT))
  53
  54 static const struct vsp1_sru_param vsp1_sru_params[] = {
  55         {
  56                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(256, 4) | VI6_SRU_CTRL0_EN,
  57                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(24, 40, 255),
  58         }, {
  59                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(256, 4) | VI6_SRU_CTRL0_EN,
  60                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(8, 16, 255),
  61         }, {
  62                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(384, 5) | VI6_SRU_CTRL0_EN,
  63                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(36, 60, 255),
  64         }, {
  65                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(384, 5) | VI6_SRU_CTRL0_EN,
  66                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(12, 27, 255),
  67         }, {
  68                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(511, 6) | VI6_SRU_CTRL0_EN,
  69                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(48, 80, 255),
  70         }, {
  71                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(511, 6) | VI6_SRU_CTRL0_EN,
  72                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(16, 36, 255),
  73         },
  74 };
  75
  76 static int sru_s_ctrl(struct v4l2_ctrl *ctrl)
  77 {
  78         struct vsp1_sru *sru =
  79                 container_of(ctrl->handler, struct vsp1_sru, ctrls);
  80
  81         switch (ctrl->id) {
  82         case V4L2_CID_VSP1_SRU_INTENSITY:
  83                 sru->intensity = ctrl->val;
  84                 break;
  85         }
  86
  87         return 0;
  88 }
  89
  90 static const struct v4l2_ctrl_ops sru_ctrl_ops = {
  91         .s_ctrl = sru_s_ctrl,
  92 };
  93
  94 static const struct v4l2_ctrl_config sru_intensity_control = {
  95         .ops = &sru_ctrl_ops,
  96         .id = V4L2_CID_VSP1_SRU_INTENSITY,
  97         .name = "Intensity",
  98         .type = V4L2_CTRL_TYPE_INTEGER,
  99         .min = 1,
 100         .max = 6,
 101         .def = 1,
 102         .step = 1,
 103 };
 104
 105 /* -----------------------------------------------------------------------------
 106  * V4L2 Subdevice Core Operations
 107  */
 108
 109 static int sru_s_stream(struct v4l2_subdev *subdev, int enable)
 110 {
 111         const struct vsp1_sru_param *param;
 112         struct vsp1_sru *sru = to_sru(subdev);
 113         struct v4l2_mbus_framefmt *input;
 114         struct v4l2_mbus_framefmt *output;
 115         u32 ctrl0;
 116
 117         if (!enable)
 118                 return 0;
 119
 120         input = &sru->entity.formats[SRU_PAD_SINK];
 121         output = &sru->entity.formats[SRU_PAD_SOURCE];
 122
 123         if (input->code == MEDIA_BUS_FMT_ARGB8888_1X32)
 124                 ctrl0 = VI6_SRU_CTRL0_PARAM2 | VI6_SRU_CTRL0_PARAM3
 125                       | VI6_SRU_CTRL0_PARAM4;
 126         else
 127                 ctrl0 = VI6_SRU_CTRL0_PARAM3;
 128
 129         if (input->width != output->width)
 130                 ctrl0 |= VI6_SRU_CTRL0_MODE_UPSCALE;
 131
 132         param = &vsp1_sru_params[sru->intensity - 1];
 133
 134         ctrl0 |= param->ctrl0;
 135
 136         vsp1_sru_write(sru, VI6_SRU_CTRL0, ctrl0);
 137         vsp1_sru_write(sru, VI6_SRU_CTRL1, VI6_SRU_CTRL1_PARAM5);
 138         vsp1_sru_write(sru, VI6_SRU_CTRL2, param->ctrl2);
 139
 140         return 0;
 141 }
 142
 143 /* -----------------------------------------------------------------------------
 144  * V4L2 Subdevice Pad Operations
 145  */
 146
 147 static int sru_enum_mbus_code(struct v4l2_subdev *subdev,
 148                               struct v4l2_subdev_pad_config *cfg,
 149                               struct v4l2_subdev_mbus_code_enum *code)
 150 {
 151         static const unsigned int codes[] = {
 152                 MEDIA_BUS_FMT_ARGB8888_1X32,
 153                 MEDIA_BUS_FMT_AYUV8_1X32,
 154         };
 155         struct vsp1_sru *sru = to_sru(subdev);
 156         struct v4l2_mbus_framefmt *format;
 157
 158         if (code->pad == SRU_PAD_SINK) {
 159                 if (code->index >= ARRAY_SIZE(codes))
 160                         return -EINVAL;
 161
 162                 code->code = codes[code->index];
 163         } else {
 164                 /* The SRU can't perform format conversion, the sink format is
 165                  * always identical to the source format.
 166                  */
 167                 if (code->index)
 168                         return -EINVAL;
 169
 170                 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
 171                                                     SRU_PAD_SINK, code->which);
 172                 code->code = format->code;
 173         }
 174
 175         return 0;
 176 }
 177
 178 static int sru_enum_frame_size(struct v4l2_subdev *subdev,
 179                                struct v4l2_subdev_pad_config *cfg,
 180                                struct v4l2_subdev_frame_size_enum *fse)
 181 {
 182         struct vsp1_sru *sru = to_sru(subdev);
 183         struct v4l2_mbus_framefmt *format;
 184
 185         format = vsp1_entity_get_pad_format(&sru->entity, cfg,
 186                                             SRU_PAD_SINK, fse->which);
 187
 188         if (fse->index || fse->code != format->code)
 189                 return -EINVAL;
 190
 191         if (fse->pad == SRU_PAD_SINK) {
 192                 fse->min_width = SRU_MIN_SIZE;
 193                 fse->max_width = SRU_MAX_SIZE;
 194                 fse->min_height = SRU_MIN_SIZE;
 195                 fse->max_height = SRU_MAX_SIZE;
 196         } else {
 197                 fse->min_width = format->width;
 198                 fse->min_height = format->height;
 199                 if (format->width <= SRU_MAX_SIZE / 2 &&
 200                     format->height <= SRU_MAX_SIZE / 2) {
 201                         fse->max_width = format->width * 2;
 202                         fse->max_height = format->height * 2;
 203                 } else {
 204                         fse->max_width = format->width;
 205                         fse->max_height = format->height;
 206                 }
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int sru_get_format(struct v4l2_subdev *subdev,
 213                           struct v4l2_subdev_pad_config *cfg,
 214                           struct v4l2_subdev_format *fmt)
 215 {
 216         struct vsp1_sru *sru = to_sru(subdev);
 217
 218         fmt->format = *vsp1_entity_get_pad_format(&sru->entity, cfg, fmt->pad,
 219                                                   fmt->which);
 220
 221         return 0;
 222 }
 223
 224 static void sru_try_format(struct vsp1_sru *sru,
 225                            struct v4l2_subdev_pad_config *cfg,
 226                            unsigned int pad, struct v4l2_mbus_framefmt *fmt,
 227                            enum v4l2_subdev_format_whence which)
 228 {
 229         struct v4l2_mbus_framefmt *format;
 230         unsigned int input_area;
 231         unsigned int output_area;
 232
 233         switch (pad) {
 234         case SRU_PAD_SINK:
 235                 /* Default to YUV if the requested format is not supported. */
 236                 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
 237                     fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
 238                         fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
 239
 240                 fmt->width = clamp(fmt->width, SRU_MIN_SIZE, SRU_MAX_SIZE);
 241                 fmt->height = clamp(fmt->height, SRU_MIN_SIZE, SRU_MAX_SIZE);
 242                 break;
 243
 244         case SRU_PAD_SOURCE:
 245                 /* The SRU can't perform format conversion. */
 246                 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
 247                                                     SRU_PAD_SINK, which);
 248                 fmt->code = format->code;
 249
 250                 /* We can upscale by 2 in both direction, but not independently.
 251                  * Compare the input and output rectangles areas (avoiding
 252                  * integer overflows on the output): if the requested output
 253                  * area is larger than 1.5^2 the input area upscale by two,
 254                  * otherwise don't scale.
 255                  */
 256                 input_area = format->width * format->height;
 257                 output_area = min(fmt->width, SRU_MAX_SIZE)
 258                             * min(fmt->height, SRU_MAX_SIZE);
 259
 260                 if (fmt->width <= SRU_MAX_SIZE / 2 &&
 261                     fmt->height <= SRU_MAX_SIZE / 2 &&
 262                     output_area > input_area * 9 / 4) {
 263                         fmt->width = format->width * 2;
 264                         fmt->height = format->height * 2;
 265                 } else {
 266                         fmt->width = format->width;
 267                         fmt->height = format->height;
 268                 }
 269                 break;
 270         }
 271
 272         fmt->field = V4L2_FIELD_NONE;
 273         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 274 }
 275
 276 static int sru_set_format(struct v4l2_subdev *subdev,
 277                           struct v4l2_subdev_pad_config *cfg,
 278                           struct v4l2_subdev_format *fmt)
 279 {
 280         struct vsp1_sru *sru = to_sru(subdev);
 281         struct v4l2_mbus_framefmt *format;
 282
 283         sru_try_format(sru, cfg, fmt->pad, &fmt->format, fmt->which);
 284
 285         format = vsp1_entity_get_pad_format(&sru->entity, cfg, fmt->pad,
 286                                             fmt->which);
 287         *format = fmt->format;
 288
 289         if (fmt->pad == SRU_PAD_SINK) {
 290                 /* Propagate the format to the source pad. */
 291                 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
 292                                                     SRU_PAD_SOURCE, fmt->which);
 293                 *format = fmt->format;
 294
 295                 sru_try_format(sru, cfg, SRU_PAD_SOURCE, format, fmt->which);
 296         }
 297
 298         return 0;
 299 }
 300
 301 /* -----------------------------------------------------------------------------
 302  * V4L2 Subdevice Operations
 303  */
 304
 305 static struct v4l2_subdev_video_ops sru_video_ops = {
 306         .s_stream = sru_s_stream,
 307 };
 308
 309 static struct v4l2_subdev_pad_ops sru_pad_ops = {
 310         .enum_mbus_code = sru_enum_mbus_code,
 311         .enum_frame_size = sru_enum_frame_size,
 312         .get_fmt = sru_get_format,
 313         .set_fmt = sru_set_format,
 314 };
 315
 316 static struct v4l2_subdev_ops sru_ops = {
 317         .video  = &sru_video_ops,
 318         .pad    = &sru_pad_ops,
 319 };
 320
 321 /* -----------------------------------------------------------------------------
 322  * Initialization and Cleanup
 323  */
 324
 325 struct vsp1_sru *vsp1_sru_create(struct vsp1_device *vsp1)
 326 {
 327         struct vsp1_sru *sru;
 328         int ret;
 329
 330         sru = devm_kzalloc(vsp1->dev, sizeof(*sru), GFP_KERNEL);
 331         if (sru == NULL)
 332                 return ERR_PTR(-ENOMEM);
 333
 334         sru->entity.type = VSP1_ENTITY_SRU;
 335
 336         ret = vsp1_entity_init(vsp1, &sru->entity, "sru", 2, &sru_ops);
 337         if (ret < 0)
 338                 return ERR_PTR(ret);
 339
 340         /* Initialize the control handler. */
 341         v4l2_ctrl_handler_init(&sru->ctrls, 1);
 342         v4l2_ctrl_new_custom(&sru->ctrls, &sru_intensity_control, NULL);
 343
 344         sru->intensity = 1;
 345
 346         sru->entity.subdev.ctrl_handler = &sru->ctrls;
 347
 348         if (sru->ctrls.error) {
 349                 dev_err(vsp1->dev, "sru: failed to initialize controls\n");
 350                 ret = sru->ctrls.error;
 351                 vsp1_entity_destroy(&sru->entity);
 352                 return ERR_PTR(ret);
 353         }
 354
 355         return sru;
 356 }