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
vsp1_sru_read(struct vsp1_sru * sru,u32 reg)29 static inline u32 vsp1_sru_read(struct vsp1_sru *sru, u32 reg)
30 {
31 return vsp1_read(sru->entity.vsp1, reg);
32 }
33
vsp1_sru_write(struct vsp1_sru * sru,u32 reg,u32 data)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 struct vsp1_sru_param {
46 u32 ctrl0;
47 u32 ctrl2;
48 };
49
50 #define VI6_SRU_CTRL0_PARAMS(p0, p1) \
51 (((p0) << VI6_SRU_CTRL0_PARAM0_SHIFT) | \
52 ((p1) << VI6_SRU_CTRL0_PARAM1_SHIFT))
53
54 #define VI6_SRU_CTRL2_PARAMS(p6, p7, p8) \
55 (((p6) << VI6_SRU_CTRL2_PARAM6_SHIFT) | \
56 ((p7) << VI6_SRU_CTRL2_PARAM7_SHIFT) | \
57 ((p8) << VI6_SRU_CTRL2_PARAM8_SHIFT))
58
59 static const struct vsp1_sru_param vsp1_sru_params[] = {
60 {
61 .ctrl0 = VI6_SRU_CTRL0_PARAMS(256, 4) | VI6_SRU_CTRL0_EN,
62 .ctrl2 = VI6_SRU_CTRL2_PARAMS(24, 40, 255),
63 }, {
64 .ctrl0 = VI6_SRU_CTRL0_PARAMS(256, 4) | VI6_SRU_CTRL0_EN,
65 .ctrl2 = VI6_SRU_CTRL2_PARAMS(8, 16, 255),
66 }, {
67 .ctrl0 = VI6_SRU_CTRL0_PARAMS(384, 5) | VI6_SRU_CTRL0_EN,
68 .ctrl2 = VI6_SRU_CTRL2_PARAMS(36, 60, 255),
69 }, {
70 .ctrl0 = VI6_SRU_CTRL0_PARAMS(384, 5) | VI6_SRU_CTRL0_EN,
71 .ctrl2 = VI6_SRU_CTRL2_PARAMS(12, 27, 255),
72 }, {
73 .ctrl0 = VI6_SRU_CTRL0_PARAMS(511, 6) | VI6_SRU_CTRL0_EN,
74 .ctrl2 = VI6_SRU_CTRL2_PARAMS(48, 80, 255),
75 }, {
76 .ctrl0 = VI6_SRU_CTRL0_PARAMS(511, 6) | VI6_SRU_CTRL0_EN,
77 .ctrl2 = VI6_SRU_CTRL2_PARAMS(16, 36, 255),
78 },
79 };
80
sru_s_ctrl(struct v4l2_ctrl * ctrl)81 static int sru_s_ctrl(struct v4l2_ctrl *ctrl)
82 {
83 struct vsp1_sru *sru =
84 container_of(ctrl->handler, struct vsp1_sru, ctrls);
85 const struct vsp1_sru_param *param;
86 u32 value;
87
88 switch (ctrl->id) {
89 case V4L2_CID_VSP1_SRU_INTENSITY:
90 param = &vsp1_sru_params[ctrl->val - 1];
91
92 value = vsp1_sru_read(sru, VI6_SRU_CTRL0);
93 value &= ~(VI6_SRU_CTRL0_PARAM0_MASK |
94 VI6_SRU_CTRL0_PARAM1_MASK);
95 value |= param->ctrl0;
96 vsp1_sru_write(sru, VI6_SRU_CTRL0, value);
97
98 vsp1_sru_write(sru, VI6_SRU_CTRL2, param->ctrl2);
99 break;
100 }
101
102 return 0;
103 }
104
105 static const struct v4l2_ctrl_ops sru_ctrl_ops = {
106 .s_ctrl = sru_s_ctrl,
107 };
108
109 static const struct v4l2_ctrl_config sru_intensity_control = {
110 .ops = &sru_ctrl_ops,
111 .id = V4L2_CID_VSP1_SRU_INTENSITY,
112 .name = "Intensity",
113 .type = V4L2_CTRL_TYPE_INTEGER,
114 .min = 1,
115 .max = 6,
116 .def = 1,
117 .step = 1,
118 };
119
120 /* -----------------------------------------------------------------------------
121 * V4L2 Subdevice Core Operations
122 */
123
sru_s_stream(struct v4l2_subdev * subdev,int enable)124 static int sru_s_stream(struct v4l2_subdev *subdev, int enable)
125 {
126 struct vsp1_sru *sru = to_sru(subdev);
127 struct v4l2_mbus_framefmt *input;
128 struct v4l2_mbus_framefmt *output;
129 u32 ctrl0;
130 int ret;
131
132 ret = vsp1_entity_set_streaming(&sru->entity, enable);
133 if (ret < 0)
134 return ret;
135
136 if (!enable)
137 return 0;
138
139 input = &sru->entity.formats[SRU_PAD_SINK];
140 output = &sru->entity.formats[SRU_PAD_SOURCE];
141
142 if (input->code == MEDIA_BUS_FMT_ARGB8888_1X32)
143 ctrl0 = VI6_SRU_CTRL0_PARAM2 | VI6_SRU_CTRL0_PARAM3
144 | VI6_SRU_CTRL0_PARAM4;
145 else
146 ctrl0 = VI6_SRU_CTRL0_PARAM3;
147
148 if (input->width != output->width)
149 ctrl0 |= VI6_SRU_CTRL0_MODE_UPSCALE;
150
151 /* Take the control handler lock to ensure that the CTRL0 value won't be
152 * changed behind our back by a set control operation.
153 */
154 mutex_lock(sru->ctrls.lock);
155 ctrl0 |= vsp1_sru_read(sru, VI6_SRU_CTRL0)
156 & (VI6_SRU_CTRL0_PARAM0_MASK | VI6_SRU_CTRL0_PARAM1_MASK);
157 vsp1_sru_write(sru, VI6_SRU_CTRL0, ctrl0);
158 mutex_unlock(sru->ctrls.lock);
159
160 vsp1_sru_write(sru, VI6_SRU_CTRL1, VI6_SRU_CTRL1_PARAM5);
161
162 return 0;
163 }
164
165 /* -----------------------------------------------------------------------------
166 * V4L2 Subdevice Pad Operations
167 */
168
sru_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)169 static int sru_enum_mbus_code(struct v4l2_subdev *subdev,
170 struct v4l2_subdev_pad_config *cfg,
171 struct v4l2_subdev_mbus_code_enum *code)
172 {
173 static const unsigned int codes[] = {
174 MEDIA_BUS_FMT_ARGB8888_1X32,
175 MEDIA_BUS_FMT_AYUV8_1X32,
176 };
177 struct vsp1_sru *sru = to_sru(subdev);
178 struct v4l2_mbus_framefmt *format;
179
180 if (code->pad == SRU_PAD_SINK) {
181 if (code->index >= ARRAY_SIZE(codes))
182 return -EINVAL;
183
184 code->code = codes[code->index];
185 } else {
186 /* The SRU can't perform format conversion, the sink format is
187 * always identical to the source format.
188 */
189 if (code->index)
190 return -EINVAL;
191
192 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
193 SRU_PAD_SINK, code->which);
194 code->code = format->code;
195 }
196
197 return 0;
198 }
199
sru_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)200 static int sru_enum_frame_size(struct v4l2_subdev *subdev,
201 struct v4l2_subdev_pad_config *cfg,
202 struct v4l2_subdev_frame_size_enum *fse)
203 {
204 struct vsp1_sru *sru = to_sru(subdev);
205 struct v4l2_mbus_framefmt *format;
206
207 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
208 SRU_PAD_SINK, fse->which);
209
210 if (fse->index || fse->code != format->code)
211 return -EINVAL;
212
213 if (fse->pad == SRU_PAD_SINK) {
214 fse->min_width = SRU_MIN_SIZE;
215 fse->max_width = SRU_MAX_SIZE;
216 fse->min_height = SRU_MIN_SIZE;
217 fse->max_height = SRU_MAX_SIZE;
218 } else {
219 fse->min_width = format->width;
220 fse->min_height = format->height;
221 if (format->width <= SRU_MAX_SIZE / 2 &&
222 format->height <= SRU_MAX_SIZE / 2) {
223 fse->max_width = format->width * 2;
224 fse->max_height = format->height * 2;
225 } else {
226 fse->max_width = format->width;
227 fse->max_height = format->height;
228 }
229 }
230
231 return 0;
232 }
233
sru_get_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)234 static int sru_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
235 struct v4l2_subdev_format *fmt)
236 {
237 struct vsp1_sru *sru = to_sru(subdev);
238
239 fmt->format = *vsp1_entity_get_pad_format(&sru->entity, cfg, fmt->pad,
240 fmt->which);
241
242 return 0;
243 }
244
sru_try_format(struct vsp1_sru * sru,struct v4l2_subdev_pad_config * cfg,unsigned int pad,struct v4l2_mbus_framefmt * fmt,enum v4l2_subdev_format_whence which)245 static void sru_try_format(struct vsp1_sru *sru, struct v4l2_subdev_pad_config *cfg,
246 unsigned int pad, struct v4l2_mbus_framefmt *fmt,
247 enum v4l2_subdev_format_whence which)
248 {
249 struct v4l2_mbus_framefmt *format;
250 unsigned int input_area;
251 unsigned int output_area;
252
253 switch (pad) {
254 case SRU_PAD_SINK:
255 /* Default to YUV if the requested format is not supported. */
256 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
257 fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
258 fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
259
260 fmt->width = clamp(fmt->width, SRU_MIN_SIZE, SRU_MAX_SIZE);
261 fmt->height = clamp(fmt->height, SRU_MIN_SIZE, SRU_MAX_SIZE);
262 break;
263
264 case SRU_PAD_SOURCE:
265 /* The SRU can't perform format conversion. */
266 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
267 SRU_PAD_SINK, which);
268 fmt->code = format->code;
269
270 /* We can upscale by 2 in both direction, but not independently.
271 * Compare the input and output rectangles areas (avoiding
272 * integer overflows on the output): if the requested output
273 * area is larger than 1.5^2 the input area upscale by two,
274 * otherwise don't scale.
275 */
276 input_area = format->width * format->height;
277 output_area = min(fmt->width, SRU_MAX_SIZE)
278 * min(fmt->height, SRU_MAX_SIZE);
279
280 if (fmt->width <= SRU_MAX_SIZE / 2 &&
281 fmt->height <= SRU_MAX_SIZE / 2 &&
282 output_area > input_area * 9 / 4) {
283 fmt->width = format->width * 2;
284 fmt->height = format->height * 2;
285 } else {
286 fmt->width = format->width;
287 fmt->height = format->height;
288 }
289 break;
290 }
291
292 fmt->field = V4L2_FIELD_NONE;
293 fmt->colorspace = V4L2_COLORSPACE_SRGB;
294 }
295
sru_set_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)296 static int sru_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
297 struct v4l2_subdev_format *fmt)
298 {
299 struct vsp1_sru *sru = to_sru(subdev);
300 struct v4l2_mbus_framefmt *format;
301
302 sru_try_format(sru, cfg, fmt->pad, &fmt->format, fmt->which);
303
304 format = vsp1_entity_get_pad_format(&sru->entity, cfg, fmt->pad,
305 fmt->which);
306 *format = fmt->format;
307
308 if (fmt->pad == SRU_PAD_SINK) {
309 /* Propagate the format to the source pad. */
310 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
311 SRU_PAD_SOURCE, fmt->which);
312 *format = fmt->format;
313
314 sru_try_format(sru, cfg, SRU_PAD_SOURCE, format, fmt->which);
315 }
316
317 return 0;
318 }
319
320 /* -----------------------------------------------------------------------------
321 * V4L2 Subdevice Operations
322 */
323
324 static struct v4l2_subdev_video_ops sru_video_ops = {
325 .s_stream = sru_s_stream,
326 };
327
328 static struct v4l2_subdev_pad_ops sru_pad_ops = {
329 .enum_mbus_code = sru_enum_mbus_code,
330 .enum_frame_size = sru_enum_frame_size,
331 .get_fmt = sru_get_format,
332 .set_fmt = sru_set_format,
333 };
334
335 static struct v4l2_subdev_ops sru_ops = {
336 .video = &sru_video_ops,
337 .pad = &sru_pad_ops,
338 };
339
340 /* -----------------------------------------------------------------------------
341 * Initialization and Cleanup
342 */
343
vsp1_sru_create(struct vsp1_device * vsp1)344 struct vsp1_sru *vsp1_sru_create(struct vsp1_device *vsp1)
345 {
346 struct v4l2_subdev *subdev;
347 struct vsp1_sru *sru;
348 int ret;
349
350 sru = devm_kzalloc(vsp1->dev, sizeof(*sru), GFP_KERNEL);
351 if (sru == NULL)
352 return ERR_PTR(-ENOMEM);
353
354 sru->entity.type = VSP1_ENTITY_SRU;
355
356 ret = vsp1_entity_init(vsp1, &sru->entity, 2);
357 if (ret < 0)
358 return ERR_PTR(ret);
359
360 /* Initialize the V4L2 subdev. */
361 subdev = &sru->entity.subdev;
362 v4l2_subdev_init(subdev, &sru_ops);
363
364 subdev->entity.ops = &vsp1_media_ops;
365 subdev->internal_ops = &vsp1_subdev_internal_ops;
366 snprintf(subdev->name, sizeof(subdev->name), "%s sru",
367 dev_name(vsp1->dev));
368 v4l2_set_subdevdata(subdev, sru);
369 subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
370
371 vsp1_entity_init_formats(subdev, NULL);
372
373 /* Initialize the control handler. */
374 v4l2_ctrl_handler_init(&sru->ctrls, 1);
375 v4l2_ctrl_new_custom(&sru->ctrls, &sru_intensity_control, NULL);
376
377 sru->entity.subdev.ctrl_handler = &sru->ctrls;
378
379 if (sru->ctrls.error) {
380 dev_err(vsp1->dev, "sru: failed to initialize controls\n");
381 ret = sru->ctrls.error;
382 vsp1_entity_destroy(&sru->entity);
383 return ERR_PTR(ret);
384 }
385
386 return sru;
387 }
388