2 * vsp1_uds.c -- R-Car VSP1 Up and Down Scaler
4 * Copyright (C) 2013-2014 Renesas Electronics Corporation
6 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
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.
14 #include <linux/device.h>
15 #include <linux/gfp.h>
17 #include <media/v4l2-subdev.h>
23 #define UDS_MIN_SIZE 4U
24 #define UDS_MAX_SIZE 8190U
26 #define UDS_MIN_FACTOR 0x0100
27 #define UDS_MAX_FACTOR 0xffff
29 /* -----------------------------------------------------------------------------
33 static inline void vsp1_uds_write(struct vsp1_uds *uds, struct vsp1_dl_list *dl,
36 vsp1_dl_list_write(dl, reg + uds->entity.index * VI6_UDS_OFFSET, data);
39 /* -----------------------------------------------------------------------------
43 void vsp1_uds_set_alpha(struct vsp1_entity *entity, struct vsp1_dl_list *dl,
46 struct vsp1_uds *uds = to_uds(&entity->subdev);
48 vsp1_uds_write(uds, dl, VI6_UDS_ALPVAL,
49 alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
53 * uds_output_size - Return the output size for an input size and scaling ratio
54 * @input: input size in pixels
55 * @ratio: scaling ratio in U4.12 fixed-point format
57 static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
64 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
66 return (input - 1) / mp * mp * 4096 / ratio + 1;
69 return (input - 1) * 4096 / ratio + 1;
74 * uds_output_limits - Return the min and max output sizes for an input size
75 * @input: input size in pixels
76 * @minimum: minimum output size (returned)
77 * @maximum: maximum output size (returned)
79 static void uds_output_limits(unsigned int input,
80 unsigned int *minimum, unsigned int *maximum)
82 *minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE);
83 *maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE);
87 * uds_passband_width - Return the passband filter width for a scaling ratio
88 * @ratio: scaling ratio in U4.12 fixed-point format
90 static unsigned int uds_passband_width(unsigned int ratio)
97 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
99 return 64 * 4096 * mp / ratio;
106 static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
108 /* TODO: This is an approximation that will need to be refined. */
109 return (input - 1) * 4096 / (output - 1);
112 /* -----------------------------------------------------------------------------
113 * V4L2 Subdevice Pad Operations
116 static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
117 struct v4l2_subdev_pad_config *cfg,
118 struct v4l2_subdev_mbus_code_enum *code)
120 static const unsigned int codes[] = {
121 MEDIA_BUS_FMT_ARGB8888_1X32,
122 MEDIA_BUS_FMT_AYUV8_1X32,
125 return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
129 static int uds_enum_frame_size(struct v4l2_subdev *subdev,
130 struct v4l2_subdev_pad_config *cfg,
131 struct v4l2_subdev_frame_size_enum *fse)
133 struct vsp1_uds *uds = to_uds(subdev);
134 struct v4l2_subdev_pad_config *config;
135 struct v4l2_mbus_framefmt *format;
137 config = vsp1_entity_get_pad_config(&uds->entity, cfg, fse->which);
141 format = vsp1_entity_get_pad_format(&uds->entity, config,
144 if (fse->index || fse->code != format->code)
147 if (fse->pad == UDS_PAD_SINK) {
148 fse->min_width = UDS_MIN_SIZE;
149 fse->max_width = UDS_MAX_SIZE;
150 fse->min_height = UDS_MIN_SIZE;
151 fse->max_height = UDS_MAX_SIZE;
153 uds_output_limits(format->width, &fse->min_width,
155 uds_output_limits(format->height, &fse->min_height,
162 static void uds_try_format(struct vsp1_uds *uds,
163 struct v4l2_subdev_pad_config *config,
164 unsigned int pad, struct v4l2_mbus_framefmt *fmt)
166 struct v4l2_mbus_framefmt *format;
167 unsigned int minimum;
168 unsigned int maximum;
172 /* Default to YUV if the requested format is not supported. */
173 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
174 fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
175 fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
177 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
178 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
182 /* The UDS scales but can't perform format conversion. */
183 format = vsp1_entity_get_pad_format(&uds->entity, config,
185 fmt->code = format->code;
187 uds_output_limits(format->width, &minimum, &maximum);
188 fmt->width = clamp(fmt->width, minimum, maximum);
189 uds_output_limits(format->height, &minimum, &maximum);
190 fmt->height = clamp(fmt->height, minimum, maximum);
194 fmt->field = V4L2_FIELD_NONE;
195 fmt->colorspace = V4L2_COLORSPACE_SRGB;
198 static int uds_set_format(struct v4l2_subdev *subdev,
199 struct v4l2_subdev_pad_config *cfg,
200 struct v4l2_subdev_format *fmt)
202 struct vsp1_uds *uds = to_uds(subdev);
203 struct v4l2_subdev_pad_config *config;
204 struct v4l2_mbus_framefmt *format;
206 config = vsp1_entity_get_pad_config(&uds->entity, cfg, fmt->which);
210 uds_try_format(uds, config, fmt->pad, &fmt->format);
212 format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad);
213 *format = fmt->format;
215 if (fmt->pad == UDS_PAD_SINK) {
216 /* Propagate the format to the source pad. */
217 format = vsp1_entity_get_pad_format(&uds->entity, config,
219 *format = fmt->format;
221 uds_try_format(uds, config, UDS_PAD_SOURCE, format);
227 /* -----------------------------------------------------------------------------
228 * V4L2 Subdevice Operations
231 static const struct v4l2_subdev_pad_ops uds_pad_ops = {
232 .init_cfg = vsp1_entity_init_cfg,
233 .enum_mbus_code = uds_enum_mbus_code,
234 .enum_frame_size = uds_enum_frame_size,
235 .get_fmt = vsp1_subdev_get_pad_format,
236 .set_fmt = uds_set_format,
239 static const struct v4l2_subdev_ops uds_ops = {
243 /* -----------------------------------------------------------------------------
244 * VSP1 Entity Operations
247 static void uds_configure(struct vsp1_entity *entity,
248 struct vsp1_pipeline *pipe,
249 struct vsp1_dl_list *dl, bool full)
251 struct vsp1_uds *uds = to_uds(&entity->subdev);
252 const struct v4l2_mbus_framefmt *output;
253 const struct v4l2_mbus_framefmt *input;
261 input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
263 output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
266 hscale = uds_compute_ratio(input->width, output->width);
267 vscale = uds_compute_ratio(input->height, output->height);
269 dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);
271 /* Multi-tap scaling can't be enabled along with alpha scaling when
272 * scaling down with a factor lower than or equal to 1/2 in either
275 if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))
280 vsp1_uds_write(uds, dl, VI6_UDS_CTRL,
281 (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
282 (multitap ? VI6_UDS_CTRL_BC : 0));
284 vsp1_uds_write(uds, dl, VI6_UDS_PASS_BWIDTH,
285 (uds_passband_width(hscale)
286 << VI6_UDS_PASS_BWIDTH_H_SHIFT) |
287 (uds_passband_width(vscale)
288 << VI6_UDS_PASS_BWIDTH_V_SHIFT));
290 /* Set the scaling ratios and the output size. */
291 vsp1_uds_write(uds, dl, VI6_UDS_SCALE,
292 (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
293 (vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
294 vsp1_uds_write(uds, dl, VI6_UDS_CLIP_SIZE,
295 (output->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
296 (output->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
299 static const struct vsp1_entity_operations uds_entity_ops = {
300 .configure = uds_configure,
303 /* -----------------------------------------------------------------------------
304 * Initialization and Cleanup
307 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
309 struct vsp1_uds *uds;
313 uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
315 return ERR_PTR(-ENOMEM);
317 uds->entity.ops = &uds_entity_ops;
318 uds->entity.type = VSP1_ENTITY_UDS;
319 uds->entity.index = index;
321 sprintf(name, "uds.%u", index);
322 ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops,
323 MEDIA_ENT_F_PROC_VIDEO_SCALER);