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 mutex_unlock(sru->ctrls.lock);
158
159 vsp1_sru_write(sru, VI6_SRU_CTRL1, VI6_SRU_CTRL1_PARAM5);
160
161 return 0;
162 }
163
164 /* -----------------------------------------------------------------------------
165 * V4L2 Subdevice Pad Operations
166 */
167
sru_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * code)168 static int sru_enum_mbus_code(struct v4l2_subdev *subdev,
169 struct v4l2_subdev_pad_config *cfg,
170 struct v4l2_subdev_mbus_code_enum *code)
171 {
172 static const unsigned int codes[] = {
173 MEDIA_BUS_FMT_ARGB8888_1X32,
174 MEDIA_BUS_FMT_AYUV8_1X32,
175 };
176 struct vsp1_sru *sru = to_sru(subdev);
177 struct v4l2_mbus_framefmt *format;
178
179 if (code->pad == SRU_PAD_SINK) {
180 if (code->index >= ARRAY_SIZE(codes))
181 return -EINVAL;
182
183 code->code = codes[code->index];
184 } else {
185 /* The SRU can't perform format conversion, the sink format is
186 * always identical to the source format.
187 */
188 if (code->index)
189 return -EINVAL;
190
191 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
192 SRU_PAD_SINK, code->which);
193 code->code = format->code;
194 }
195
196 return 0;
197 }
198
sru_enum_frame_size(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_frame_size_enum * fse)199 static int sru_enum_frame_size(struct v4l2_subdev *subdev,
200 struct v4l2_subdev_pad_config *cfg,
201 struct v4l2_subdev_frame_size_enum *fse)
202 {
203 struct vsp1_sru *sru = to_sru(subdev);
204 struct v4l2_mbus_framefmt *format;
205
206 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
207 SRU_PAD_SINK, fse->which);
208
209 if (fse->index || fse->code != format->code)
210 return -EINVAL;
211
212 if (fse->pad == SRU_PAD_SINK) {
213 fse->min_width = SRU_MIN_SIZE;
214 fse->max_width = SRU_MAX_SIZE;
215 fse->min_height = SRU_MIN_SIZE;
216 fse->max_height = SRU_MAX_SIZE;
217 } else {
218 fse->min_width = format->width;
219 fse->min_height = format->height;
220 if (format->width <= SRU_MAX_SIZE / 2 &&
221 format->height <= SRU_MAX_SIZE / 2) {
222 fse->max_width = format->width * 2;
223 fse->max_height = format->height * 2;
224 } else {
225 fse->max_width = format->width;
226 fse->max_height = format->height;
227 }
228 }
229
230 return 0;
231 }
232
sru_get_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)233 static int sru_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
234 struct v4l2_subdev_format *fmt)
235 {
236 struct vsp1_sru *sru = to_sru(subdev);
237
238 fmt->format = *vsp1_entity_get_pad_format(&sru->entity, cfg, fmt->pad,
239 fmt->which);
240
241 return 0;
242 }
243
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)244 static void sru_try_format(struct vsp1_sru *sru, struct v4l2_subdev_pad_config *cfg,
245 unsigned int pad, struct v4l2_mbus_framefmt *fmt,
246 enum v4l2_subdev_format_whence which)
247 {
248 struct v4l2_mbus_framefmt *format;
249 unsigned int input_area;
250 unsigned int output_area;
251
252 switch (pad) {
253 case SRU_PAD_SINK:
254 /* Default to YUV if the requested format is not supported. */
255 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
256 fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
257 fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
258
259 fmt->width = clamp(fmt->width, SRU_MIN_SIZE, SRU_MAX_SIZE);
260 fmt->height = clamp(fmt->height, SRU_MIN_SIZE, SRU_MAX_SIZE);
261 break;
262
263 case SRU_PAD_SOURCE:
264 /* The SRU can't perform format conversion. */
265 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
266 SRU_PAD_SINK, which);
267 fmt->code = format->code;
268
269 /* We can upscale by 2 in both direction, but not independently.
270 * Compare the input and output rectangles areas (avoiding
271 * integer overflows on the output): if the requested output
272 * area is larger than 1.5^2 the input area upscale by two,
273 * otherwise don't scale.
274 */
275 input_area = format->width * format->height;
276 output_area = min(fmt->width, SRU_MAX_SIZE)
277 * min(fmt->height, SRU_MAX_SIZE);
278
279 if (fmt->width <= SRU_MAX_SIZE / 2 &&
280 fmt->height <= SRU_MAX_SIZE / 2 &&
281 output_area > input_area * 9 / 4) {
282 fmt->width = format->width * 2;
283 fmt->height = format->height * 2;
284 } else {
285 fmt->width = format->width;
286 fmt->height = format->height;
287 }
288 break;
289 }
290
291 fmt->field = V4L2_FIELD_NONE;
292 fmt->colorspace = V4L2_COLORSPACE_SRGB;
293 }
294
sru_set_format(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)295 static int sru_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
296 struct v4l2_subdev_format *fmt)
297 {
298 struct vsp1_sru *sru = to_sru(subdev);
299 struct v4l2_mbus_framefmt *format;
300
301 sru_try_format(sru, cfg, fmt->pad, &fmt->format, fmt->which);
302
303 format = vsp1_entity_get_pad_format(&sru->entity, cfg, fmt->pad,
304 fmt->which);
305 *format = fmt->format;
306
307 if (fmt->pad == SRU_PAD_SINK) {
308 /* Propagate the format to the source pad. */
309 format = vsp1_entity_get_pad_format(&sru->entity, cfg,
310 SRU_PAD_SOURCE, fmt->which);
311 *format = fmt->format;
312
313 sru_try_format(sru, cfg, SRU_PAD_SOURCE, format, fmt->which);
314 }
315
316 return 0;
317 }
318
319 /* -----------------------------------------------------------------------------
320 * V4L2 Subdevice Operations
321 */
322
323 static struct v4l2_subdev_video_ops sru_video_ops = {
324 .s_stream = sru_s_stream,
325 };
326
327 static struct v4l2_subdev_pad_ops sru_pad_ops = {
328 .enum_mbus_code = sru_enum_mbus_code,
329 .enum_frame_size = sru_enum_frame_size,
330 .get_fmt = sru_get_format,
331 .set_fmt = sru_set_format,
332 };
333
334 static struct v4l2_subdev_ops sru_ops = {
335 .video = &sru_video_ops,
336 .pad = &sru_pad_ops,
337 };
338
339 /* -----------------------------------------------------------------------------
340 * Initialization and Cleanup
341 */
342
vsp1_sru_create(struct vsp1_device * vsp1)343 struct vsp1_sru *vsp1_sru_create(struct vsp1_device *vsp1)
344 {
345 struct v4l2_subdev *subdev;
346 struct vsp1_sru *sru;
347 int ret;
348
349 sru = devm_kzalloc(vsp1->dev, sizeof(*sru), GFP_KERNEL);
350 if (sru == NULL)
351 return ERR_PTR(-ENOMEM);
352
353 sru->entity.type = VSP1_ENTITY_SRU;
354
355 ret = vsp1_entity_init(vsp1, &sru->entity, 2);
356 if (ret < 0)
357 return ERR_PTR(ret);
358
359 /* Initialize the V4L2 subdev. */
360 subdev = &sru->entity.subdev;
361 v4l2_subdev_init(subdev, &sru_ops);
362
363 subdev->entity.ops = &vsp1_media_ops;
364 subdev->internal_ops = &vsp1_subdev_internal_ops;
365 snprintf(subdev->name, sizeof(subdev->name), "%s sru",
366 dev_name(vsp1->dev));
367 v4l2_set_subdevdata(subdev, sru);
368 subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
369
370 vsp1_entity_init_formats(subdev, NULL);
371
372 /* Initialize the control handler. */
373 v4l2_ctrl_handler_init(&sru->ctrls, 1);
374 v4l2_ctrl_new_custom(&sru->ctrls, &sru_intensity_control, NULL);
375
376 sru->entity.subdev.ctrl_handler = &sru->ctrls;
377
378 if (sru->ctrls.error) {
379 dev_err(vsp1->dev, "sru: failed to initialize controls\n");
380 ret = sru->ctrls.error;
381 vsp1_entity_destroy(&sru->entity);
382 return ERR_PTR(ret);
383 }
384
385 return sru;
386 }
387