Commit | Line | Data |
---|---|---|
26e0ca22 LP |
1 | /* |
2 | * vsp1_uds.c -- R-Car VSP1 Up and Down Scaler | |
3 | * | |
8a1edc55 | 4 | * Copyright (C) 2013-2014 Renesas Electronics Corporation |
26e0ca22 LP |
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" | |
5e8dbbf3 | 20 | #include "vsp1_dl.h" |
26e0ca22 LP |
21 | #include "vsp1_uds.h" |
22 | ||
23 | #define UDS_MIN_SIZE 4U | |
24 | #define UDS_MAX_SIZE 8190U | |
25 | ||
26 | #define UDS_MIN_FACTOR 0x0100 | |
27 | #define UDS_MAX_FACTOR 0xffff | |
28 | ||
29 | /* ----------------------------------------------------------------------------- | |
30 | * Device Access | |
31 | */ | |
32 | ||
5e8dbbf3 LP |
33 | static inline void vsp1_uds_write(struct vsp1_uds *uds, struct vsp1_dl_list *dl, |
34 | u32 reg, u32 data) | |
26e0ca22 | 35 | { |
5e8dbbf3 | 36 | vsp1_dl_list_write(dl, reg + uds->entity.index * VI6_UDS_OFFSET, data); |
26e0ca22 LP |
37 | } |
38 | ||
39 | /* ----------------------------------------------------------------------------- | |
40 | * Scaling Computation | |
41 | */ | |
42 | ||
5e8dbbf3 LP |
43 | void vsp1_uds_set_alpha(struct vsp1_uds *uds, struct vsp1_dl_list *dl, |
44 | unsigned int alpha) | |
bdc2df62 | 45 | { |
5e8dbbf3 LP |
46 | vsp1_uds_write(uds, dl, VI6_UDS_ALPVAL, |
47 | alpha << VI6_UDS_ALPVAL_VAL0_SHIFT); | |
bdc2df62 LP |
48 | } |
49 | ||
26e0ca22 LP |
50 | /* |
51 | * uds_output_size - Return the output size for an input size and scaling ratio | |
52 | * @input: input size in pixels | |
53 | * @ratio: scaling ratio in U4.12 fixed-point format | |
54 | */ | |
55 | static unsigned int uds_output_size(unsigned int input, unsigned int ratio) | |
56 | { | |
57 | if (ratio > 4096) { | |
58 | /* Down-scaling */ | |
59 | unsigned int mp; | |
60 | ||
61 | mp = ratio / 4096; | |
62 | mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4); | |
63 | ||
64 | return (input - 1) / mp * mp * 4096 / ratio + 1; | |
65 | } else { | |
66 | /* Up-scaling */ | |
67 | return (input - 1) * 4096 / ratio + 1; | |
68 | } | |
69 | } | |
70 | ||
71 | /* | |
72 | * uds_output_limits - Return the min and max output sizes for an input size | |
73 | * @input: input size in pixels | |
74 | * @minimum: minimum output size (returned) | |
75 | * @maximum: maximum output size (returned) | |
76 | */ | |
77 | static void uds_output_limits(unsigned int input, | |
78 | unsigned int *minimum, unsigned int *maximum) | |
79 | { | |
80 | *minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE); | |
81 | *maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE); | |
82 | } | |
83 | ||
84 | /* | |
85 | * uds_passband_width - Return the passband filter width for a scaling ratio | |
86 | * @ratio: scaling ratio in U4.12 fixed-point format | |
87 | */ | |
88 | static unsigned int uds_passband_width(unsigned int ratio) | |
89 | { | |
90 | if (ratio >= 4096) { | |
91 | /* Down-scaling */ | |
92 | unsigned int mp; | |
93 | ||
94 | mp = ratio / 4096; | |
95 | mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4); | |
96 | ||
97 | return 64 * 4096 * mp / ratio; | |
98 | } else { | |
99 | /* Up-scaling */ | |
100 | return 64; | |
101 | } | |
102 | } | |
103 | ||
104 | static unsigned int uds_compute_ratio(unsigned int input, unsigned int output) | |
105 | { | |
106 | /* TODO: This is an approximation that will need to be refined. */ | |
107 | return (input - 1) * 4096 / (output - 1); | |
108 | } | |
109 | ||
26e0ca22 LP |
110 | /* ----------------------------------------------------------------------------- |
111 | * V4L2 Subdevice Pad Operations | |
112 | */ | |
113 | ||
114 | static int uds_enum_mbus_code(struct v4l2_subdev *subdev, | |
f7234138 | 115 | struct v4l2_subdev_pad_config *cfg, |
26e0ca22 LP |
116 | struct v4l2_subdev_mbus_code_enum *code) |
117 | { | |
118 | static const unsigned int codes[] = { | |
27ffaeb0 BB |
119 | MEDIA_BUS_FMT_ARGB8888_1X32, |
120 | MEDIA_BUS_FMT_AYUV8_1X32, | |
26e0ca22 | 121 | }; |
26e0ca22 | 122 | |
6ad9ba9c LP |
123 | return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes, |
124 | ARRAY_SIZE(codes)); | |
26e0ca22 LP |
125 | } |
126 | ||
127 | static int uds_enum_frame_size(struct v4l2_subdev *subdev, | |
f7234138 | 128 | struct v4l2_subdev_pad_config *cfg, |
26e0ca22 LP |
129 | struct v4l2_subdev_frame_size_enum *fse) |
130 | { | |
5778e749 | 131 | struct vsp1_uds *uds = to_uds(subdev); |
e790c3cb | 132 | struct v4l2_subdev_pad_config *config; |
26e0ca22 LP |
133 | struct v4l2_mbus_framefmt *format; |
134 | ||
e790c3cb LP |
135 | config = vsp1_entity_get_pad_config(&uds->entity, cfg, fse->which); |
136 | if (!config) | |
137 | return -EINVAL; | |
138 | ||
139 | format = vsp1_entity_get_pad_format(&uds->entity, config, | |
140 | UDS_PAD_SINK); | |
26e0ca22 LP |
141 | |
142 | if (fse->index || fse->code != format->code) | |
143 | return -EINVAL; | |
144 | ||
145 | if (fse->pad == UDS_PAD_SINK) { | |
146 | fse->min_width = UDS_MIN_SIZE; | |
147 | fse->max_width = UDS_MAX_SIZE; | |
148 | fse->min_height = UDS_MIN_SIZE; | |
149 | fse->max_height = UDS_MAX_SIZE; | |
150 | } else { | |
151 | uds_output_limits(format->width, &fse->min_width, | |
152 | &fse->max_width); | |
153 | uds_output_limits(format->height, &fse->min_height, | |
154 | &fse->max_height); | |
155 | } | |
156 | ||
157 | return 0; | |
158 | } | |
159 | ||
1bd0a1bd | 160 | static void uds_try_format(struct vsp1_uds *uds, |
e790c3cb LP |
161 | struct v4l2_subdev_pad_config *config, |
162 | unsigned int pad, struct v4l2_mbus_framefmt *fmt) | |
26e0ca22 LP |
163 | { |
164 | struct v4l2_mbus_framefmt *format; | |
165 | unsigned int minimum; | |
166 | unsigned int maximum; | |
167 | ||
168 | switch (pad) { | |
169 | case UDS_PAD_SINK: | |
170 | /* Default to YUV if the requested format is not supported. */ | |
27ffaeb0 BB |
171 | if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 && |
172 | fmt->code != MEDIA_BUS_FMT_AYUV8_1X32) | |
173 | fmt->code = MEDIA_BUS_FMT_AYUV8_1X32; | |
26e0ca22 LP |
174 | |
175 | fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE); | |
176 | fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE); | |
177 | break; | |
178 | ||
179 | case UDS_PAD_SOURCE: | |
180 | /* The UDS scales but can't perform format conversion. */ | |
e790c3cb LP |
181 | format = vsp1_entity_get_pad_format(&uds->entity, config, |
182 | UDS_PAD_SINK); | |
26e0ca22 LP |
183 | fmt->code = format->code; |
184 | ||
185 | uds_output_limits(format->width, &minimum, &maximum); | |
186 | fmt->width = clamp(fmt->width, minimum, maximum); | |
187 | uds_output_limits(format->height, &minimum, &maximum); | |
188 | fmt->height = clamp(fmt->height, minimum, maximum); | |
189 | break; | |
190 | } | |
191 | ||
192 | fmt->field = V4L2_FIELD_NONE; | |
193 | fmt->colorspace = V4L2_COLORSPACE_SRGB; | |
194 | } | |
195 | ||
1bd0a1bd LP |
196 | static int uds_set_format(struct v4l2_subdev *subdev, |
197 | struct v4l2_subdev_pad_config *cfg, | |
26e0ca22 LP |
198 | struct v4l2_subdev_format *fmt) |
199 | { | |
200 | struct vsp1_uds *uds = to_uds(subdev); | |
e790c3cb | 201 | struct v4l2_subdev_pad_config *config; |
26e0ca22 LP |
202 | struct v4l2_mbus_framefmt *format; |
203 | ||
e790c3cb LP |
204 | config = vsp1_entity_get_pad_config(&uds->entity, cfg, fmt->which); |
205 | if (!config) | |
206 | return -EINVAL; | |
207 | ||
208 | uds_try_format(uds, config, fmt->pad, &fmt->format); | |
26e0ca22 | 209 | |
e790c3cb | 210 | format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad); |
26e0ca22 LP |
211 | *format = fmt->format; |
212 | ||
213 | if (fmt->pad == UDS_PAD_SINK) { | |
214 | /* Propagate the format to the source pad. */ | |
e790c3cb LP |
215 | format = vsp1_entity_get_pad_format(&uds->entity, config, |
216 | UDS_PAD_SOURCE); | |
26e0ca22 LP |
217 | *format = fmt->format; |
218 | ||
e790c3cb | 219 | uds_try_format(uds, config, UDS_PAD_SOURCE, format); |
26e0ca22 LP |
220 | } |
221 | ||
26e0ca22 LP |
222 | return 0; |
223 | } | |
224 | ||
225 | /* ----------------------------------------------------------------------------- | |
226 | * V4L2 Subdevice Operations | |
227 | */ | |
228 | ||
eb9163d3 | 229 | static const struct v4l2_subdev_pad_ops uds_pad_ops = { |
0efdf0f5 | 230 | .init_cfg = vsp1_entity_init_cfg, |
26e0ca22 LP |
231 | .enum_mbus_code = uds_enum_mbus_code, |
232 | .enum_frame_size = uds_enum_frame_size, | |
3f557220 | 233 | .get_fmt = vsp1_subdev_get_pad_format, |
26e0ca22 LP |
234 | .set_fmt = uds_set_format, |
235 | }; | |
236 | ||
eb9163d3 | 237 | static const struct v4l2_subdev_ops uds_ops = { |
26e0ca22 LP |
238 | .pad = &uds_pad_ops, |
239 | }; | |
240 | ||
7b905f05 LP |
241 | /* ----------------------------------------------------------------------------- |
242 | * VSP1 Entity Operations | |
243 | */ | |
244 | ||
83dd019d LP |
245 | static void uds_configure(struct vsp1_entity *entity, |
246 | struct vsp1_pipeline *pipe, | |
247 | struct vsp1_dl_list *dl) | |
7b905f05 LP |
248 | { |
249 | struct vsp1_uds *uds = to_uds(&entity->subdev); | |
250 | const struct v4l2_mbus_framefmt *output; | |
251 | const struct v4l2_mbus_framefmt *input; | |
252 | unsigned int hscale; | |
253 | unsigned int vscale; | |
254 | bool multitap; | |
255 | ||
256 | input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config, | |
257 | UDS_PAD_SINK); | |
258 | output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config, | |
259 | UDS_PAD_SOURCE); | |
260 | ||
261 | hscale = uds_compute_ratio(input->width, output->width); | |
262 | vscale = uds_compute_ratio(input->height, output->height); | |
263 | ||
264 | dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale); | |
265 | ||
266 | /* Multi-tap scaling can't be enabled along with alpha scaling when | |
267 | * scaling down with a factor lower than or equal to 1/2 in either | |
268 | * direction. | |
269 | */ | |
270 | if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192)) | |
271 | multitap = false; | |
272 | else | |
273 | multitap = true; | |
274 | ||
5e8dbbf3 | 275 | vsp1_uds_write(uds, dl, VI6_UDS_CTRL, |
7b905f05 LP |
276 | (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) | |
277 | (multitap ? VI6_UDS_CTRL_BC : 0)); | |
278 | ||
5e8dbbf3 | 279 | vsp1_uds_write(uds, dl, VI6_UDS_PASS_BWIDTH, |
7b905f05 LP |
280 | (uds_passband_width(hscale) |
281 | << VI6_UDS_PASS_BWIDTH_H_SHIFT) | | |
282 | (uds_passband_width(vscale) | |
283 | << VI6_UDS_PASS_BWIDTH_V_SHIFT)); | |
284 | ||
285 | /* Set the scaling ratios and the output size. */ | |
5e8dbbf3 | 286 | vsp1_uds_write(uds, dl, VI6_UDS_SCALE, |
7b905f05 LP |
287 | (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) | |
288 | (vscale << VI6_UDS_SCALE_VFRAC_SHIFT)); | |
5e8dbbf3 | 289 | vsp1_uds_write(uds, dl, VI6_UDS_CLIP_SIZE, |
7b905f05 LP |
290 | (output->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) | |
291 | (output->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT)); | |
292 | } | |
293 | ||
294 | static const struct vsp1_entity_operations uds_entity_ops = { | |
295 | .configure = uds_configure, | |
296 | }; | |
297 | ||
26e0ca22 LP |
298 | /* ----------------------------------------------------------------------------- |
299 | * Initialization and Cleanup | |
300 | */ | |
301 | ||
302 | struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index) | |
303 | { | |
26e0ca22 | 304 | struct vsp1_uds *uds; |
823329df | 305 | char name[6]; |
26e0ca22 LP |
306 | int ret; |
307 | ||
308 | uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL); | |
309 | if (uds == NULL) | |
310 | return ERR_PTR(-ENOMEM); | |
311 | ||
7b905f05 | 312 | uds->entity.ops = &uds_entity_ops; |
26e0ca22 LP |
313 | uds->entity.type = VSP1_ENTITY_UDS; |
314 | uds->entity.index = index; | |
26e0ca22 | 315 | |
823329df | 316 | sprintf(name, "uds.%u", index); |
6a8e07b2 LP |
317 | ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops, |
318 | MEDIA_ENT_F_PROC_VIDEO_SCALER); | |
26e0ca22 LP |
319 | if (ret < 0) |
320 | return ERR_PTR(ret); | |
321 | ||
26e0ca22 LP |
322 | return uds; |
323 | } |