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 u32 vsp1_sru_read(struct vsp1_sru *sru, u32 reg)
  30 {
  31         return vsp1_read(sru->entity.vsp1, reg);
  32 }
  33
  34 static inline void vsp1_sru_write(struct vsp1_sru *sru, u32 reg, u32 data)
  35 {
  36         vsp1_write(sru->entity.vsp1, reg, data);
  37 }
  38
  39 /* -----------------------------------------------------------------------------
  40  * Controls
  41  */
  42
  43 #define V4L2_CID_VSP1_SRU_INTENSITY             (V4L2_CID_USER_BASE + 1)
  44
  45 static int sru_s_ctrl(struct v4l2_ctrl *ctrl)
  46 {
  47         struct vsp1_sru *sru =
  48                 container_of(ctrl->handler, struct vsp1_sru, ctrls);
  49
  50         switch (ctrl->id) {
  51         case V4L2_CID_VSP1_SRU_INTENSITY:
  52                 sru->intensity = ctrl->val;
  53                 break;
  54         }
  55
  56         return 0;
  57 }
  58
  59 static const struct v4l2_ctrl_ops sru_ctrl_ops = {
  60         .s_ctrl = sru_s_ctrl,
  61 };
  62
  63 static const struct v4l2_ctrl_config sru_intensity_control = {
  64         .ops = &sru_ctrl_ops,
  65         .id = V4L2_CID_VSP1_SRU_INTENSITY,
  66         .name = "Intensity",
  67         .type = V4L2_CTRL_TYPE_INTEGER,
  68         .min = 1,
  69         .max = 6,
  70         .step = 1,
  71 };
  72
  73 /* -----------------------------------------------------------------------------
  74  * V4L2 Subdevice Core Operations
  75  */
  76
  77 struct vsp1_sru_param {
  78         u32 ctrl0;
  79         u32 ctrl2;
  80 };
  81
  82 #define VI6_SRU_CTRL0_PARAMS(p0, p1)                    \
  83         (((p0) << VI6_SRU_CTRL0_PARAM0_SHIFT) |         \
  84          ((p1) << VI6_SRU_CTRL0_PARAM1_SHIFT))
  85
  86 #define VI6_SRU_CTRL2_PARAMS(p6, p7, p8)                \
  87         (((p6) << VI6_SRU_CTRL2_PARAM6_SHIFT) |         \
  88          ((p7) << VI6_SRU_CTRL2_PARAM7_SHIFT) |         \
  89          ((p8) << VI6_SRU_CTRL2_PARAM8_SHIFT))
  90
  91 static const struct vsp1_sru_param vsp1_sru_params[] = {
  92         {
  93                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(256, 4) | VI6_SRU_CTRL0_EN,
  94                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(24, 40, 255),
  95         }, {
  96                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(256, 4) | VI6_SRU_CTRL0_EN,
  97                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(8, 16, 255),
  98         }, {
  99                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(384, 5) | VI6_SRU_CTRL0_EN,
 100                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(36, 60, 255),
 101         }, {
 102                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(384, 5) | VI6_SRU_CTRL0_EN,
 103                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(12, 27, 255),
 104         }, {
 105                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(511, 6) | VI6_SRU_CTRL0_EN,
 106                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(48, 80, 255),
 107         }, {
 108                 .ctrl0 = VI6_SRU_CTRL0_PARAMS(511, 6) | VI6_SRU_CTRL0_EN,
 109                 .ctrl2 = VI6_SRU_CTRL2_PARAMS(16, 36, 255),
 110         },
 111 };
 112
 113 static int sru_s_stream(struct v4l2_subdev *subdev, int enable)
 114 {
 115         struct vsp1_sru *sru = to_sru(subdev);
 116         const struct vsp1_sru_param *param;
 117         struct v4l2_mbus_framefmt *input;
 118         struct v4l2_mbus_framefmt *output;
 119         bool upscale;
 120         u32 ctrl0;
 121
 122         if (!enable)
 123                 return 0;
 124
 125         input = &sru->entity.formats[SRU_PAD_SINK];
 126         output = &sru->entity.formats[SRU_PAD_SOURCE];
 127         upscale = input->width != output->width;
 128         param = &vsp1_sru_params[sru->intensity];
 129
 130         if (input->code == V4L2_MBUS_FMT_ARGB8888_1X32)
 131                 ctrl0 = VI6_SRU_CTRL0_PARAM2 | VI6_SRU_CTRL0_PARAM3
 132                       | VI6_SRU_CTRL0_PARAM4;
 133         else
 134                 ctrl0 = VI6_SRU_CTRL0_PARAM3;
 135
 136         vsp1_sru_write(sru, VI6_SRU_CTRL0, param->ctrl0 | ctrl0 |
 137                        (upscale ? VI6_SRU_CTRL0_MODE_UPSCALE : 0));
 138         vsp1_sru_write(sru, VI6_SRU_CTRL1, VI6_SRU_CTRL1_PARAM5);
 139         vsp1_sru_write(sru, VI6_SRU_CTRL2, param->ctrl2);
 140
 141         return 0;
 142 }
 143
 144 /* -----------------------------------------------------------------------------
 145  * V4L2 Subdevice Pad Operations
 146  */
 147
 148 static int sru_enum_mbus_code(struct v4l2_subdev *subdev,
 149                               struct v4l2_subdev_fh *fh,
 150                               struct v4l2_subdev_mbus_code_enum *code)
 151 {
 152         static const unsigned int codes[] = {
 153                 V4L2_MBUS_FMT_ARGB8888_1X32,
 154                 V4L2_MBUS_FMT_AYUV8_1X32,
 155         };
 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 = v4l2_subdev_get_try_format(fh, SRU_PAD_SINK);
 171                 code->code = format->code;
 172         }
 173
 174         return 0;
 175 }
 176
 177 static int sru_enum_frame_size(struct v4l2_subdev *subdev,
 178                                struct v4l2_subdev_fh *fh,
 179                                struct v4l2_subdev_frame_size_enum *fse)
 180 {
 181         struct v4l2_mbus_framefmt *format;
 182
 183         format = v4l2_subdev_get_try_format(fh, SRU_PAD_SINK);
 184
 185         if (fse->index || fse->code != format->code)
 186                 return -EINVAL;
 187
 188         if (fse->pad == SRU_PAD_SINK) {
 189                 fse->min_width = SRU_MIN_SIZE;
 190                 fse->max_width = SRU_MAX_SIZE;
 191                 fse->min_height = SRU_MIN_SIZE;
 192                 fse->max_height = SRU_MAX_SIZE;
 193         } else {
 194                 fse->min_width = format->width;
 195                 fse->min_height = format->height;
 196                 if (format->width <= SRU_MAX_SIZE / 2 &&
 197                     format->height <= SRU_MAX_SIZE / 2) {
 198                         fse->max_width = format->width * 2;
 199                         fse->max_height = format->height * 2;
 200                 } else {
 201                         fse->max_width = format->width;
 202                         fse->max_height = format->height;
 203                 }
 204         }
 205
 206         return 0;
 207 }
 208
 209 static int sru_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
 210                           struct v4l2_subdev_format *fmt)
 211 {
 212         struct vsp1_sru *sru = to_sru(subdev);
 213
 214         fmt->format = *vsp1_entity_get_pad_format(&sru->entity, fh, fmt->pad,
 215                                                   fmt->which);
 216
 217         return 0;
 218 }
 219
 220 static void sru_try_format(struct vsp1_sru *sru, struct v4l2_subdev_fh *fh,
 221                            unsigned int pad, struct v4l2_mbus_framefmt *fmt,
 222                            enum v4l2_subdev_format_whence which)
 223 {
 224         struct v4l2_mbus_framefmt *format;
 225         unsigned int input_area;
 226         unsigned int output_area;
 227
 228         switch (pad) {
 229         case SRU_PAD_SINK:
 230                 /* Default to YUV if the requested format is not supported. */
 231                 if (fmt->code != V4L2_MBUS_FMT_ARGB8888_1X32 &&
 232                     fmt->code != V4L2_MBUS_FMT_AYUV8_1X32)
 233                         fmt->code = V4L2_MBUS_FMT_AYUV8_1X32;
 234
 235                 fmt->width = clamp(fmt->width, SRU_MIN_SIZE, SRU_MAX_SIZE);
 236                 fmt->height = clamp(fmt->height, SRU_MIN_SIZE, SRU_MAX_SIZE);
 237                 break;
 238
 239         case SRU_PAD_SOURCE:
 240                 /* The SRU can't perform format conversion. */
 241                 format = vsp1_entity_get_pad_format(&sru->entity, fh,
 242                                                     SRU_PAD_SINK, which);
 243                 fmt->code = format->code;
 244
 245                 /* We can upscale by 2 in both direction, but not independently.
 246                  * Compare the input and output rectangles areas (avoiding
 247                  * integer overflows on the output): if the requested output
 248                  * area is larger than 1.5^2 the input area upscale by two,
 249                  * otherwise don't scale.
 250                  */
 251                 input_area = format->width * format->height;
 252                 output_area = min(fmt->width, SRU_MAX_SIZE)
 253                             * min(fmt->height, SRU_MAX_SIZE);
 254
 255                 if (fmt->width <= SRU_MAX_SIZE / 2 &&
 256                     fmt->height <= SRU_MAX_SIZE / 2 &&
 257                     output_area > input_area * 9 / 4) {
 258                         fmt->width = format->width * 2;
 259                         fmt->height = format->height * 2;
 260                 } else {
 261                         fmt->width = format->width;
 262                         fmt->height = format->height;
 263                 }
 264                 break;
 265         }
 266
 267         fmt->field = V4L2_FIELD_NONE;
 268         fmt->colorspace = V4L2_COLORSPACE_SRGB;
 269 }
 270
 271 static int sru_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
 272                           struct v4l2_subdev_format *fmt)
 273 {
 274         struct vsp1_sru *sru = to_sru(subdev);
 275         struct v4l2_mbus_framefmt *format;
 276
 277         sru_try_format(sru, fh, fmt->pad, &fmt->format, fmt->which);
 278
 279         format = vsp1_entity_get_pad_format(&sru->entity, fh, fmt->pad,
 280                                             fmt->which);
 281         *format = fmt->format;
 282
 283         if (fmt->pad == SRU_PAD_SINK) {
 284                 /* Propagate the format to the source pad. */
 285                 format = vsp1_entity_get_pad_format(&sru->entity, fh,
 286                                                     SRU_PAD_SOURCE, fmt->which);
 287                 *format = fmt->format;
 288
 289                 sru_try_format(sru, fh, SRU_PAD_SOURCE, format, fmt->which);
 290         }
 291
 292         return 0;
 293 }
 294
 295 /* -----------------------------------------------------------------------------
 296  * V4L2 Subdevice Operations
 297  */
 298
 299 static struct v4l2_subdev_video_ops sru_video_ops = {
 300         .s_stream = sru_s_stream,
 301 };
 302
 303 static struct v4l2_subdev_pad_ops sru_pad_ops = {
 304         .enum_mbus_code = sru_enum_mbus_code,
 305         .enum_frame_size = sru_enum_frame_size,
 306         .get_fmt = sru_get_format,
 307         .set_fmt = sru_set_format,
 308 };
 309
 310 static struct v4l2_subdev_ops sru_ops = {
 311         .video  = &sru_video_ops,
 312         .pad    = &sru_pad_ops,
 313 };
 314
 315 /* -----------------------------------------------------------------------------
 316  * Initialization and Cleanup
 317  */
 318
 319 struct vsp1_sru *vsp1_sru_create(struct vsp1_device *vsp1)
 320 {
 321         struct v4l2_subdev *subdev;
 322         struct vsp1_sru *sru;
 323         int ret;
 324
 325         sru = devm_kzalloc(vsp1->dev, sizeof(*sru), GFP_KERNEL);
 326         if (sru == NULL)
 327                 return ERR_PTR(-ENOMEM);
 328
 329         sru->entity.type = VSP1_ENTITY_SRU;
 330
 331         ret = vsp1_entity_init(vsp1, &sru->entity, 2);
 332         if (ret < 0)
 333                 return ERR_PTR(ret);
 334
 335         /* Initialize the V4L2 subdev. */
 336         subdev = &sru->entity.subdev;
 337         v4l2_subdev_init(subdev, &sru_ops);
 338
 339         subdev->entity.ops = &vsp1_media_ops;
 340         subdev->internal_ops = &vsp1_subdev_internal_ops;
 341         snprintf(subdev->name, sizeof(subdev->name), "%s sru",
 342                  dev_name(vsp1->dev));
 343         v4l2_set_subdevdata(subdev, sru);
 344         subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
 345
 346         vsp1_entity_init_formats(subdev, NULL);
 347
 348         /* Initialize the control handler. */
 349         v4l2_ctrl_handler_init(&sru->ctrls, 1);
 350         v4l2_ctrl_new_custom(&sru->ctrls, &sru_intensity_control, NULL);
 351         v4l2_ctrl_handler_setup(&sru->ctrls);
 352         sru->entity.subdev.ctrl_handler = &sru->ctrls;
 353
 354         return sru;
 355 }