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
vsp1_uds_write(struct vsp1_uds * uds,struct vsp1_dl_body * dlb,u32 reg,u32 data)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
vsp1_uds_set_alpha(struct vsp1_entity * entity,struct vsp1_dl_body * dlb,unsigned int alpha)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 */
uds_output_size(unsigned int input,unsigned int ratio)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 */
uds_output_limits(unsigned int input,unsigned int * minimum,unsigned int * maximum)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 */
uds_passband_width(unsigned int ratio)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
uds_compute_ratio(unsigned int input,unsigned int output)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
uds_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_mbus_code_enum * code)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
uds_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_frame_size_enum * fse)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 = 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
160 done:
161 mutex_unlock(&uds->entity.lock);
162 return ret;
163 }
164
uds_try_format(struct vsp1_uds * uds,struct v4l2_subdev_state * sd_state,unsigned int pad,struct v4l2_mbus_framefmt * fmt)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 = 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
uds_set_format(struct v4l2_subdev * subdev,struct v4l2_subdev_state * sd_state,struct v4l2_subdev_format * fmt)201 static 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
232 done:
233 mutex_unlock(&uds->entity.lock);
234 return ret;
235 }
236
237 /* -----------------------------------------------------------------------------
238 * V4L2 Subdevice Operations
239 */
240
241 static 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
248 static const struct v4l2_subdev_ops uds_ops = {
249 .pad = &uds_pad_ops,
250 };
251
252 /* -----------------------------------------------------------------------------
253 * VSP1 Entity Operations
254 */
255
uds_configure_stream(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_dl_list * dl,struct vsp1_dl_body * dlb)256 static 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
uds_configure_partition(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_dl_list * dl,struct vsp1_dl_body * dlb)304 static 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
uds_max_width(struct vsp1_entity * entity,struct vsp1_pipeline * pipe)330 static 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
uds_partition(struct vsp1_entity * entity,struct vsp1_pipeline * pipe,struct vsp1_partition * partition,unsigned int partition_idx,struct vsp1_partition_window * window)366 static 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
393 static 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
vsp1_uds_create(struct vsp1_device * vsp1,unsigned int index)404 struct 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