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 *state; 132 struct v4l2_mbus_framefmt *format; 133 int ret = 0; 134 135 state = vsp1_entity_get_state(&uds->entity, sd_state, fse->which); 136 if (!state) 137 return -EINVAL; 138 139 format = vsp1_entity_get_pad_format(&uds->entity, state, UDS_PAD_SINK); 140 141 mutex_lock(&uds->entity.lock); 142 143 if (fse->index || fse->code != format->code) { 144 ret = -EINVAL; 145 goto done; 146 } 147 148 if (fse->pad == UDS_PAD_SINK) { 149 fse->min_width = UDS_MIN_SIZE; 150 fse->max_width = UDS_MAX_SIZE; 151 fse->min_height = UDS_MIN_SIZE; 152 fse->max_height = UDS_MAX_SIZE; 153 } else { 154 uds_output_limits(format->width, &fse->min_width, 155 &fse->max_width); 156 uds_output_limits(format->height, &fse->min_height, 157 &fse->max_height); 158 } 159 160done: 161 mutex_unlock(&uds->entity.lock); 162 return ret; 163} 164 165static void uds_try_format(struct vsp1_uds *uds, 166 struct v4l2_subdev_state *sd_state, 167 unsigned int pad, struct v4l2_mbus_framefmt *fmt) 168{ 169 struct v4l2_mbus_framefmt *format; 170 unsigned int minimum; 171 unsigned int maximum; 172 173 switch (pad) { 174 case UDS_PAD_SINK: 175 /* Default to YUV if the requested format is not supported. */ 176 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 && 177 fmt->code != MEDIA_BUS_FMT_AYUV8_1X32) 178 fmt->code = MEDIA_BUS_FMT_AYUV8_1X32; 179 180 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE); 181 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE); 182 break; 183 184 case UDS_PAD_SOURCE: 185 /* The UDS scales but can't perform format conversion. */ 186 format = vsp1_entity_get_pad_format(&uds->entity, sd_state, 187 UDS_PAD_SINK); 188 fmt->code = format->code; 189 190 uds_output_limits(format->width, &minimum, &maximum); 191 fmt->width = clamp(fmt->width, minimum, maximum); 192 uds_output_limits(format->height, &minimum, &maximum); 193 fmt->height = clamp(fmt->height, minimum, maximum); 194 break; 195 } 196 197 fmt->field = V4L2_FIELD_NONE; 198 fmt->colorspace = V4L2_COLORSPACE_SRGB; 199} 200 201static int uds_set_format(struct v4l2_subdev *subdev, 202 struct v4l2_subdev_state *sd_state, 203 struct v4l2_subdev_format *fmt) 204{ 205 struct vsp1_uds *uds = to_uds(subdev); 206 struct v4l2_subdev_state *state; 207 struct v4l2_mbus_framefmt *format; 208 int ret = 0; 209 210 mutex_lock(&uds->entity.lock); 211 212 state = vsp1_entity_get_state(&uds->entity, sd_state, fmt->which); 213 if (!state) { 214 ret = -EINVAL; 215 goto done; 216 } 217 218 uds_try_format(uds, state, fmt->pad, &fmt->format); 219 220 format = vsp1_entity_get_pad_format(&uds->entity, state, fmt->pad); 221 *format = fmt->format; 222 223 if (fmt->pad == UDS_PAD_SINK) { 224 /* Propagate the format to the source pad. */ 225 format = vsp1_entity_get_pad_format(&uds->entity, state, 226 UDS_PAD_SOURCE); 227 *format = fmt->format; 228 229 uds_try_format(uds, state, UDS_PAD_SOURCE, format); 230 } 231 232done: 233 mutex_unlock(&uds->entity.lock); 234 return ret; 235} 236 237/* ----------------------------------------------------------------------------- 238 * V4L2 Subdevice Operations 239 */ 240 241static const struct v4l2_subdev_pad_ops uds_pad_ops = { 242 .enum_mbus_code = uds_enum_mbus_code, 243 .enum_frame_size = uds_enum_frame_size, 244 .get_fmt = vsp1_subdev_get_pad_format, 245 .set_fmt = uds_set_format, 246}; 247 248static const struct v4l2_subdev_ops uds_ops = { 249 .pad = &uds_pad_ops, 250}; 251 252/* ----------------------------------------------------------------------------- 253 * VSP1 Entity Operations 254 */ 255 256static void uds_configure_stream(struct vsp1_entity *entity, 257 struct vsp1_pipeline *pipe, 258 struct vsp1_dl_list *dl, 259 struct vsp1_dl_body *dlb) 260{ 261 struct vsp1_uds *uds = to_uds(&entity->subdev); 262 const struct v4l2_mbus_framefmt *output; 263 const struct v4l2_mbus_framefmt *input; 264 unsigned int hscale; 265 unsigned int vscale; 266 bool multitap; 267 268 input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.state, 269 UDS_PAD_SINK); 270 output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.state, 271 UDS_PAD_SOURCE); 272 273 hscale = uds_compute_ratio(input->width, output->width); 274 vscale = uds_compute_ratio(input->height, output->height); 275 276 dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale); 277 278 /* 279 * Multi-tap scaling can't be enabled along with alpha scaling when 280 * scaling down with a factor lower than or equal to 1/2 in either 281 * direction. 282 */ 283 if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192)) 284 multitap = false; 285 else 286 multitap = true; 287 288 vsp1_uds_write(uds, dlb, VI6_UDS_CTRL, 289 (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) | 290 (multitap ? VI6_UDS_CTRL_BC : 0)); 291 292 vsp1_uds_write(uds, dlb, VI6_UDS_PASS_BWIDTH, 293 (uds_passband_width(hscale) 294 << VI6_UDS_PASS_BWIDTH_H_SHIFT) | 295 (uds_passband_width(vscale) 296 << VI6_UDS_PASS_BWIDTH_V_SHIFT)); 297 298 /* Set the scaling ratios. */ 299 vsp1_uds_write(uds, dlb, VI6_UDS_SCALE, 300 (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) | 301 (vscale << VI6_UDS_SCALE_VFRAC_SHIFT)); 302} 303 304static void uds_configure_partition(struct vsp1_entity *entity, 305 struct vsp1_pipeline *pipe, 306 struct vsp1_dl_list *dl, 307 struct vsp1_dl_body *dlb) 308{ 309 struct vsp1_uds *uds = to_uds(&entity->subdev); 310 struct vsp1_partition *partition = pipe->partition; 311 const struct v4l2_mbus_framefmt *output; 312 313 output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.state, 314 UDS_PAD_SOURCE); 315 316 /* Input size clipping. */ 317 vsp1_uds_write(uds, dlb, VI6_UDS_HSZCLIP, VI6_UDS_HSZCLIP_HCEN | 318 (0 << VI6_UDS_HSZCLIP_HCL_OFST_SHIFT) | 319 (partition->uds_sink.width 320 << VI6_UDS_HSZCLIP_HCL_SIZE_SHIFT)); 321 322 /* Output size clipping. */ 323 vsp1_uds_write(uds, dlb, VI6_UDS_CLIP_SIZE, 324 (partition->uds_source.width 325 << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) | 326 (output->height 327 << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT)); 328} 329 330static unsigned int uds_max_width(struct vsp1_entity *entity, 331 struct vsp1_pipeline *pipe) 332{ 333 struct vsp1_uds *uds = to_uds(&entity->subdev); 334 const struct v4l2_mbus_framefmt *output; 335 const struct v4l2_mbus_framefmt *input; 336 unsigned int hscale; 337 338 input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.state, 339 UDS_PAD_SINK); 340 output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.state, 341 UDS_PAD_SOURCE); 342 hscale = output->width / input->width; 343 344 /* 345 * The maximum width of the UDS is 304 pixels. These are input pixels 346 * in the event of up-scaling, and output pixels in the event of 347 * downscaling. 348 * 349 * To support overlapping partition windows we clamp at units of 256 and 350 * the remaining pixels are reserved. 351 */ 352 if (hscale <= 2) 353 return 256; 354 else if (hscale <= 4) 355 return 512; 356 else if (hscale <= 8) 357 return 1024; 358 else 359 return 2048; 360} 361 362/* ----------------------------------------------------------------------------- 363 * Partition Algorithm Support 364 */ 365 366static void uds_partition(struct vsp1_entity *entity, 367 struct vsp1_pipeline *pipe, 368 struct vsp1_partition *partition, 369 unsigned int partition_idx, 370 struct vsp1_partition_window *window) 371{ 372 struct vsp1_uds *uds = to_uds(&entity->subdev); 373 const struct v4l2_mbus_framefmt *output; 374 const struct v4l2_mbus_framefmt *input; 375 376 /* Initialise the partition state. */ 377 partition->uds_sink = *window; 378 partition->uds_source = *window; 379 380 input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.state, 381 UDS_PAD_SINK); 382 output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.state, 383 UDS_PAD_SOURCE); 384 385 partition->uds_sink.width = window->width * input->width 386 / output->width; 387 partition->uds_sink.left = window->left * input->width 388 / output->width; 389 390 *window = partition->uds_sink; 391} 392 393static const struct vsp1_entity_operations uds_entity_ops = { 394 .configure_stream = uds_configure_stream, 395 .configure_partition = uds_configure_partition, 396 .max_width = uds_max_width, 397 .partition = uds_partition, 398}; 399 400/* ----------------------------------------------------------------------------- 401 * Initialization and Cleanup 402 */ 403 404struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index) 405{ 406 struct vsp1_uds *uds; 407 char name[6]; 408 int ret; 409 410 uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL); 411 if (uds == NULL) 412 return ERR_PTR(-ENOMEM); 413 414 uds->entity.ops = &uds_entity_ops; 415 uds->entity.type = VSP1_ENTITY_UDS; 416 uds->entity.index = index; 417 418 sprintf(name, "uds.%u", index); 419 ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops, 420 MEDIA_ENT_F_PROC_VIDEO_SCALER); 421 if (ret < 0) 422 return ERR_PTR(ret); 423 424 return uds; 425} 426