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_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 } 125 126 static 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 = v4l2_subdev_state_get_format(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 } 159 160 done: 161 mutex_unlock(&uds->entity.lock); 162 return ret; 163 } 164 165 static 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 = v4l2_subdev_state_get_format(sd_state, UDS_PAD_SINK); 187 fmt->code = format->code; 188 189 uds_output_limits(format->width, &minimum, &maximum); 190 fmt->width = clamp(fmt->width, minimum, maximum); 191 uds_output_limits(format->height, &minimum, &maximum); 192 fmt->height = clamp(fmt->height, minimum, maximum); 193 break; 194 } 195 196 fmt->field = V4L2_FIELD_NONE; 197 fmt->colorspace = V4L2_COLORSPACE_SRGB; 198 } 199 200 static int uds_set_format(struct v4l2_subdev *subdev, 201 struct v4l2_subdev_state *sd_state, 202 struct v4l2_subdev_format *fmt) 203 { 204 struct vsp1_uds *uds = to_uds(subdev); 205 struct v4l2_subdev_state *state; 206 struct v4l2_mbus_framefmt *format; 207 int ret = 0; 208 209 mutex_lock(&uds->entity.lock); 210 211 state = vsp1_entity_get_state(&uds->entity, sd_state, fmt->which); 212 if (!state) { 213 ret = -EINVAL; 214 goto done; 215 } 216 217 uds_try_format(uds, state, fmt->pad, &fmt->format); 218 219 format = v4l2_subdev_state_get_format(state, fmt->pad); 220 *format = fmt->format; 221 222 if (fmt->pad == UDS_PAD_SINK) { 223 /* Propagate the format to the source pad. */ 224 format = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE); 225 *format = fmt->format; 226 227 uds_try_format(uds, state, UDS_PAD_SOURCE, format); 228 } 229 230 done: 231 mutex_unlock(&uds->entity.lock); 232 return ret; 233 } 234 235 /* ----------------------------------------------------------------------------- 236 * V4L2 Subdevice Operations 237 */ 238 239 static const struct v4l2_subdev_pad_ops uds_pad_ops = { 240 .enum_mbus_code = uds_enum_mbus_code, 241 .enum_frame_size = uds_enum_frame_size, 242 .get_fmt = vsp1_subdev_get_pad_format, 243 .set_fmt = uds_set_format, 244 }; 245 246 static const struct v4l2_subdev_ops uds_ops = { 247 .pad = &uds_pad_ops, 248 }; 249 250 /* ----------------------------------------------------------------------------- 251 * VSP1 Entity Operations 252 */ 253 254 static void uds_configure_stream(struct vsp1_entity *entity, 255 struct v4l2_subdev_state *state, 256 struct vsp1_pipeline *pipe, 257 struct vsp1_dl_list *dl, 258 struct vsp1_dl_body *dlb) 259 { 260 struct vsp1_uds *uds = to_uds(&entity->subdev); 261 const struct v4l2_mbus_framefmt *output; 262 const struct v4l2_mbus_framefmt *input; 263 unsigned int hscale; 264 unsigned int vscale; 265 bool multitap; 266 267 input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK); 268 output = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE); 269 270 hscale = uds_compute_ratio(input->width, output->width); 271 vscale = uds_compute_ratio(input->height, output->height); 272 273 dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale); 274 275 /* 276 * Multi-tap scaling can't be enabled along with alpha scaling when 277 * scaling down with a factor lower than or equal to 1/2 in either 278 * direction. 279 */ 280 if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192)) 281 multitap = false; 282 else 283 multitap = true; 284 285 vsp1_uds_write(uds, dlb, VI6_UDS_CTRL, 286 (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) | 287 (multitap ? VI6_UDS_CTRL_BC : 0)); 288 289 vsp1_uds_write(uds, dlb, VI6_UDS_PASS_BWIDTH, 290 (uds_passband_width(hscale) 291 << VI6_UDS_PASS_BWIDTH_H_SHIFT) | 292 (uds_passband_width(vscale) 293 << VI6_UDS_PASS_BWIDTH_V_SHIFT)); 294 295 /* Set the scaling ratios. */ 296 vsp1_uds_write(uds, dlb, VI6_UDS_SCALE, 297 (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) | 298 (vscale << VI6_UDS_SCALE_VFRAC_SHIFT)); 299 } 300 301 static void uds_configure_partition(struct vsp1_entity *entity, 302 struct vsp1_pipeline *pipe, 303 const struct vsp1_partition *partition, 304 struct vsp1_dl_list *dl, 305 struct vsp1_dl_body *dlb) 306 { 307 struct vsp1_uds *uds = to_uds(&entity->subdev); 308 309 /* Input size clipping. */ 310 vsp1_uds_write(uds, dlb, VI6_UDS_HSZCLIP, VI6_UDS_HSZCLIP_HCEN | 311 (0 << VI6_UDS_HSZCLIP_HCL_OFST_SHIFT) | 312 (partition->uds_sink.width 313 << VI6_UDS_HSZCLIP_HCL_SIZE_SHIFT)); 314 315 /* Output size clipping. */ 316 vsp1_uds_write(uds, dlb, VI6_UDS_CLIP_SIZE, 317 (partition->uds_source.width 318 << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) | 319 (partition->uds_source.height 320 << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT)); 321 } 322 323 static unsigned int uds_max_width(struct vsp1_entity *entity, 324 struct v4l2_subdev_state *state, 325 struct vsp1_pipeline *pipe) 326 { 327 const struct v4l2_mbus_framefmt *output; 328 const struct v4l2_mbus_framefmt *input; 329 unsigned int hscale; 330 331 input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK); 332 output = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE); 333 hscale = output->width / input->width; 334 335 /* 336 * The maximum width of the UDS is 304 pixels. These are input pixels 337 * in the event of up-scaling, and output pixels in the event of 338 * downscaling. 339 * 340 * To support overlapping partition windows we clamp at units of 256 and 341 * the remaining pixels are reserved. 342 */ 343 if (hscale <= 2) 344 return 256; 345 else if (hscale <= 4) 346 return 512; 347 else if (hscale <= 8) 348 return 1024; 349 else 350 return 2048; 351 } 352 353 /* ----------------------------------------------------------------------------- 354 * Partition Algorithm Support 355 */ 356 357 static void uds_partition(struct vsp1_entity *entity, 358 struct v4l2_subdev_state *state, 359 struct vsp1_pipeline *pipe, 360 struct vsp1_partition *partition, 361 unsigned int partition_idx, 362 struct v4l2_rect *window) 363 { 364 const struct v4l2_mbus_framefmt *output; 365 const struct v4l2_mbus_framefmt *input; 366 367 input = v4l2_subdev_state_get_format(state, UDS_PAD_SINK); 368 output = v4l2_subdev_state_get_format(state, UDS_PAD_SOURCE); 369 370 partition->uds_sink.width = window->width * input->width 371 / output->width; 372 partition->uds_sink.left = window->left * input->width 373 / output->width; 374 partition->uds_sink.height = input->height; 375 partition->uds_sink.top = 0; 376 377 partition->uds_source = *window; 378 379 *window = partition->uds_sink; 380 } 381 382 static const struct vsp1_entity_operations uds_entity_ops = { 383 .configure_stream = uds_configure_stream, 384 .configure_partition = uds_configure_partition, 385 .max_width = uds_max_width, 386 .partition = uds_partition, 387 }; 388 389 /* ----------------------------------------------------------------------------- 390 * Initialization and Cleanup 391 */ 392 393 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index) 394 { 395 struct vsp1_uds *uds; 396 char name[6]; 397 int ret; 398 399 uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL); 400 if (uds == NULL) 401 return ERR_PTR(-ENOMEM); 402 403 uds->entity.ops = &uds_entity_ops; 404 uds->entity.type = VSP1_ENTITY_UDS; 405 uds->entity.index = index; 406 407 sprintf(name, "uds.%u", index); 408 ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops, 409 MEDIA_ENT_F_PROC_VIDEO_SCALER); 410 if (ret < 0) 411 return ERR_PTR(ret); 412 413 return uds; 414 } 415