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26e0ca22 LP |
1 | /* |
2 | * vsp1_uds.c -- R-Car VSP1 Up and Down Scaler | |
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_uds.h" | |
21 | ||
22 | #define UDS_MIN_SIZE 4U | |
23 | #define UDS_MAX_SIZE 8190U | |
24 | ||
25 | #define UDS_MIN_FACTOR 0x0100 | |
26 | #define UDS_MAX_FACTOR 0xffff | |
27 | ||
28 | /* ----------------------------------------------------------------------------- | |
29 | * Device Access | |
30 | */ | |
31 | ||
32 | static inline u32 vsp1_uds_read(struct vsp1_uds *uds, u32 reg) | |
33 | { | |
34 | return vsp1_read(uds->entity.vsp1, | |
35 | reg + uds->entity.index * VI6_UDS_OFFSET); | |
36 | } | |
37 | ||
38 | static inline void vsp1_uds_write(struct vsp1_uds *uds, u32 reg, u32 data) | |
39 | { | |
40 | vsp1_write(uds->entity.vsp1, | |
41 | reg + uds->entity.index * VI6_UDS_OFFSET, data); | |
42 | } | |
43 | ||
44 | /* ----------------------------------------------------------------------------- | |
45 | * Scaling Computation | |
46 | */ | |
47 | ||
48 | /* | |
49 | * uds_output_size - Return the output size for an input size and scaling ratio | |
50 | * @input: input size in pixels | |
51 | * @ratio: scaling ratio in U4.12 fixed-point format | |
52 | */ | |
53 | static unsigned int uds_output_size(unsigned int input, unsigned int ratio) | |
54 | { | |
55 | if (ratio > 4096) { | |
56 | /* Down-scaling */ | |
57 | unsigned int mp; | |
58 | ||
59 | mp = ratio / 4096; | |
60 | mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4); | |
61 | ||
62 | return (input - 1) / mp * mp * 4096 / ratio + 1; | |
63 | } else { | |
64 | /* Up-scaling */ | |
65 | return (input - 1) * 4096 / ratio + 1; | |
66 | } | |
67 | } | |
68 | ||
69 | /* | |
70 | * uds_output_limits - Return the min and max output sizes for an input size | |
71 | * @input: input size in pixels | |
72 | * @minimum: minimum output size (returned) | |
73 | * @maximum: maximum output size (returned) | |
74 | */ | |
75 | static void uds_output_limits(unsigned int input, | |
76 | unsigned int *minimum, unsigned int *maximum) | |
77 | { | |
78 | *minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE); | |
79 | *maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE); | |
80 | } | |
81 | ||
82 | /* | |
83 | * uds_passband_width - Return the passband filter width for a scaling ratio | |
84 | * @ratio: scaling ratio in U4.12 fixed-point format | |
85 | */ | |
86 | static unsigned int uds_passband_width(unsigned int ratio) | |
87 | { | |
88 | if (ratio >= 4096) { | |
89 | /* Down-scaling */ | |
90 | unsigned int mp; | |
91 | ||
92 | mp = ratio / 4096; | |
93 | mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4); | |
94 | ||
95 | return 64 * 4096 * mp / ratio; | |
96 | } else { | |
97 | /* Up-scaling */ | |
98 | return 64; | |
99 | } | |
100 | } | |
101 | ||
102 | static unsigned int uds_compute_ratio(unsigned int input, unsigned int output) | |
103 | { | |
104 | /* TODO: This is an approximation that will need to be refined. */ | |
105 | return (input - 1) * 4096 / (output - 1); | |
106 | } | |
107 | ||
108 | static void uds_compute_ratios(struct vsp1_uds *uds) | |
109 | { | |
110 | struct v4l2_mbus_framefmt *input = &uds->entity.formats[UDS_PAD_SINK]; | |
111 | struct v4l2_mbus_framefmt *output = | |
112 | &uds->entity.formats[UDS_PAD_SOURCE]; | |
113 | ||
114 | uds->hscale = uds_compute_ratio(input->width, output->width); | |
115 | uds->vscale = uds_compute_ratio(input->height, output->height); | |
116 | ||
117 | dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", | |
118 | uds->hscale, uds->vscale); | |
119 | } | |
120 | ||
121 | /* ----------------------------------------------------------------------------- | |
122 | * V4L2 Subdevice Core Operations | |
123 | */ | |
124 | ||
125 | static int uds_s_stream(struct v4l2_subdev *subdev, int enable) | |
126 | { | |
127 | const struct v4l2_mbus_framefmt *format; | |
128 | struct vsp1_uds *uds = to_uds(subdev); | |
129 | ||
130 | if (!enable) | |
131 | return 0; | |
132 | ||
133 | /* Enable multi-tap scaling. */ | |
134 | vsp1_uds_write(uds, VI6_UDS_CTRL, VI6_UDS_CTRL_BC); | |
135 | ||
136 | vsp1_uds_write(uds, VI6_UDS_PASS_BWIDTH, | |
137 | (uds_passband_width(uds->hscale) | |
138 | << VI6_UDS_PASS_BWIDTH_H_SHIFT) | | |
139 | (uds_passband_width(uds->vscale) | |
140 | << VI6_UDS_PASS_BWIDTH_V_SHIFT)); | |
141 | ||
142 | ||
143 | /* Set the scaling ratios and the output size. */ | |
144 | format = &uds->entity.formats[UDS_PAD_SOURCE]; | |
145 | ||
146 | vsp1_uds_write(uds, VI6_UDS_SCALE, | |
147 | (uds->hscale << VI6_UDS_SCALE_HFRAC_SHIFT) | | |
148 | (uds->vscale << VI6_UDS_SCALE_VFRAC_SHIFT)); | |
149 | vsp1_uds_write(uds, VI6_UDS_CLIP_SIZE, | |
150 | (format->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) | | |
151 | (format->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT)); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
156 | /* ----------------------------------------------------------------------------- | |
157 | * V4L2 Subdevice Pad Operations | |
158 | */ | |
159 | ||
160 | static int uds_enum_mbus_code(struct v4l2_subdev *subdev, | |
161 | struct v4l2_subdev_fh *fh, | |
162 | struct v4l2_subdev_mbus_code_enum *code) | |
163 | { | |
164 | static const unsigned int codes[] = { | |
165 | V4L2_MBUS_FMT_ARGB8888_1X32, | |
166 | V4L2_MBUS_FMT_AYUV8_1X32, | |
167 | }; | |
168 | ||
169 | if (code->pad == UDS_PAD_SINK) { | |
170 | if (code->index >= ARRAY_SIZE(codes)) | |
171 | return -EINVAL; | |
172 | ||
173 | code->code = codes[code->index]; | |
174 | } else { | |
175 | struct v4l2_mbus_framefmt *format; | |
176 | ||
177 | /* The UDS can't perform format conversion, the sink format is | |
178 | * always identical to the source format. | |
179 | */ | |
180 | if (code->index) | |
181 | return -EINVAL; | |
182 | ||
183 | format = v4l2_subdev_get_try_format(fh, UDS_PAD_SINK); | |
184 | code->code = format->code; | |
185 | } | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static int uds_enum_frame_size(struct v4l2_subdev *subdev, | |
191 | struct v4l2_subdev_fh *fh, | |
192 | struct v4l2_subdev_frame_size_enum *fse) | |
193 | { | |
194 | struct v4l2_mbus_framefmt *format; | |
195 | ||
196 | format = v4l2_subdev_get_try_format(fh, UDS_PAD_SINK); | |
197 | ||
198 | if (fse->index || fse->code != format->code) | |
199 | return -EINVAL; | |
200 | ||
201 | if (fse->pad == UDS_PAD_SINK) { | |
202 | fse->min_width = UDS_MIN_SIZE; | |
203 | fse->max_width = UDS_MAX_SIZE; | |
204 | fse->min_height = UDS_MIN_SIZE; | |
205 | fse->max_height = UDS_MAX_SIZE; | |
206 | } else { | |
207 | uds_output_limits(format->width, &fse->min_width, | |
208 | &fse->max_width); | |
209 | uds_output_limits(format->height, &fse->min_height, | |
210 | &fse->max_height); | |
211 | } | |
212 | ||
213 | return 0; | |
214 | } | |
215 | ||
216 | static int uds_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh, | |
217 | struct v4l2_subdev_format *fmt) | |
218 | { | |
219 | struct vsp1_uds *uds = to_uds(subdev); | |
220 | ||
221 | fmt->format = *vsp1_entity_get_pad_format(&uds->entity, fh, fmt->pad, | |
222 | fmt->which); | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | static void uds_try_format(struct vsp1_uds *uds, struct v4l2_subdev_fh *fh, | |
228 | unsigned int pad, struct v4l2_mbus_framefmt *fmt, | |
229 | enum v4l2_subdev_format_whence which) | |
230 | { | |
231 | struct v4l2_mbus_framefmt *format; | |
232 | unsigned int minimum; | |
233 | unsigned int maximum; | |
234 | ||
235 | switch (pad) { | |
236 | case UDS_PAD_SINK: | |
237 | /* Default to YUV if the requested format is not supported. */ | |
238 | if (fmt->code != V4L2_MBUS_FMT_ARGB8888_1X32 && | |
239 | fmt->code != V4L2_MBUS_FMT_AYUV8_1X32) | |
240 | fmt->code = V4L2_MBUS_FMT_AYUV8_1X32; | |
241 | ||
242 | fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE); | |
243 | fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE); | |
244 | break; | |
245 | ||
246 | case UDS_PAD_SOURCE: | |
247 | /* The UDS scales but can't perform format conversion. */ | |
248 | format = vsp1_entity_get_pad_format(&uds->entity, fh, | |
249 | UDS_PAD_SINK, which); | |
250 | fmt->code = format->code; | |
251 | ||
252 | uds_output_limits(format->width, &minimum, &maximum); | |
253 | fmt->width = clamp(fmt->width, minimum, maximum); | |
254 | uds_output_limits(format->height, &minimum, &maximum); | |
255 | fmt->height = clamp(fmt->height, minimum, maximum); | |
256 | break; | |
257 | } | |
258 | ||
259 | fmt->field = V4L2_FIELD_NONE; | |
260 | fmt->colorspace = V4L2_COLORSPACE_SRGB; | |
261 | } | |
262 | ||
263 | static int uds_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh, | |
264 | struct v4l2_subdev_format *fmt) | |
265 | { | |
266 | struct vsp1_uds *uds = to_uds(subdev); | |
267 | struct v4l2_mbus_framefmt *format; | |
268 | ||
269 | uds_try_format(uds, fh, fmt->pad, &fmt->format, fmt->which); | |
270 | ||
271 | format = vsp1_entity_get_pad_format(&uds->entity, fh, fmt->pad, | |
272 | fmt->which); | |
273 | *format = fmt->format; | |
274 | ||
275 | if (fmt->pad == UDS_PAD_SINK) { | |
276 | /* Propagate the format to the source pad. */ | |
277 | format = vsp1_entity_get_pad_format(&uds->entity, fh, | |
278 | UDS_PAD_SOURCE, fmt->which); | |
279 | *format = fmt->format; | |
280 | ||
281 | uds_try_format(uds, fh, UDS_PAD_SOURCE, format, fmt->which); | |
282 | } | |
283 | ||
284 | if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE) | |
285 | uds_compute_ratios(uds); | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
290 | /* ----------------------------------------------------------------------------- | |
291 | * V4L2 Subdevice Operations | |
292 | */ | |
293 | ||
294 | static struct v4l2_subdev_video_ops uds_video_ops = { | |
295 | .s_stream = uds_s_stream, | |
296 | }; | |
297 | ||
298 | static struct v4l2_subdev_pad_ops uds_pad_ops = { | |
299 | .enum_mbus_code = uds_enum_mbus_code, | |
300 | .enum_frame_size = uds_enum_frame_size, | |
301 | .get_fmt = uds_get_format, | |
302 | .set_fmt = uds_set_format, | |
303 | }; | |
304 | ||
305 | static struct v4l2_subdev_ops uds_ops = { | |
306 | .video = &uds_video_ops, | |
307 | .pad = &uds_pad_ops, | |
308 | }; | |
309 | ||
310 | /* ----------------------------------------------------------------------------- | |
311 | * Initialization and Cleanup | |
312 | */ | |
313 | ||
314 | struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index) | |
315 | { | |
316 | struct v4l2_subdev *subdev; | |
317 | struct vsp1_uds *uds; | |
318 | int ret; | |
319 | ||
320 | uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL); | |
321 | if (uds == NULL) | |
322 | return ERR_PTR(-ENOMEM); | |
323 | ||
324 | uds->entity.type = VSP1_ENTITY_UDS; | |
325 | uds->entity.index = index; | |
326 | uds->entity.id = VI6_DPR_NODE_UDS(index); | |
327 | ||
328 | ret = vsp1_entity_init(vsp1, &uds->entity, 2); | |
329 | if (ret < 0) | |
330 | return ERR_PTR(ret); | |
331 | ||
332 | /* Initialize the V4L2 subdev. */ | |
333 | subdev = &uds->entity.subdev; | |
334 | v4l2_subdev_init(subdev, &uds_ops); | |
335 | ||
336 | subdev->entity.ops = &vsp1_media_ops; | |
337 | subdev->internal_ops = &vsp1_subdev_internal_ops; | |
338 | snprintf(subdev->name, sizeof(subdev->name), "%s uds.%u", | |
339 | dev_name(vsp1->dev), index); | |
340 | v4l2_set_subdevdata(subdev, uds); | |
341 | subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; | |
342 | ||
343 | vsp1_entity_init_formats(subdev, NULL); | |
344 | ||
345 | return uds; | |
346 | } |