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_uds *uds, struct vsp1_dl_list *dl,
46 vsp1_uds_write(uds, dl, VI6_UDS_ALPVAL,
47 alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
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
55 static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
62 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
64 return (input - 1) / mp * mp * 4096 / ratio + 1;
67 return (input - 1) * 4096 / ratio + 1;
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)
77 static void uds_output_limits(unsigned int input,
78 unsigned int *minimum, unsigned int *maximum)
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);
85 * uds_passband_width - Return the passband filter width for a scaling ratio
86 * @ratio: scaling ratio in U4.12 fixed-point format
88 static unsigned int uds_passband_width(unsigned int ratio)
95 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
97 return 64 * 4096 * mp / ratio;
104 static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
106 /* TODO: This is an approximation that will need to be refined. */
107 return (input - 1) * 4096 / (output - 1);
110 /* -----------------------------------------------------------------------------
111 * V4L2 Subdevice Pad Operations
114 static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
115 struct v4l2_subdev_pad_config *cfg,
116 struct v4l2_subdev_mbus_code_enum *code)
118 static const unsigned int codes[] = {
119 MEDIA_BUS_FMT_ARGB8888_1X32,
120 MEDIA_BUS_FMT_AYUV8_1X32,
123 return vsp1_subdev_enum_mbus_code(subdev, cfg, code, codes,
127 static int uds_enum_frame_size(struct v4l2_subdev *subdev,
128 struct v4l2_subdev_pad_config *cfg,
129 struct v4l2_subdev_frame_size_enum *fse)
131 struct vsp1_uds *uds = to_uds(subdev);
132 struct v4l2_subdev_pad_config *config;
133 struct v4l2_mbus_framefmt *format;
135 config = vsp1_entity_get_pad_config(&uds->entity, cfg, fse->which);
139 format = vsp1_entity_get_pad_format(&uds->entity, config,
142 if (fse->index || fse->code != format->code)
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;
151 uds_output_limits(format->width, &fse->min_width,
153 uds_output_limits(format->height, &fse->min_height,
160 static void uds_try_format(struct vsp1_uds *uds,
161 struct v4l2_subdev_pad_config *config,
162 unsigned int pad, struct v4l2_mbus_framefmt *fmt)
164 struct v4l2_mbus_framefmt *format;
165 unsigned int minimum;
166 unsigned int maximum;
170 /* Default to YUV if the requested format is not supported. */
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;
175 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
176 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
180 /* The UDS scales but can't perform format conversion. */
181 format = vsp1_entity_get_pad_format(&uds->entity, config,
183 fmt->code = format->code;
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);
192 fmt->field = V4L2_FIELD_NONE;
193 fmt->colorspace = V4L2_COLORSPACE_SRGB;
196 static int uds_set_format(struct v4l2_subdev *subdev,
197 struct v4l2_subdev_pad_config *cfg,
198 struct v4l2_subdev_format *fmt)
200 struct vsp1_uds *uds = to_uds(subdev);
201 struct v4l2_subdev_pad_config *config;
202 struct v4l2_mbus_framefmt *format;
204 config = vsp1_entity_get_pad_config(&uds->entity, cfg, fmt->which);
208 uds_try_format(uds, config, fmt->pad, &fmt->format);
210 format = vsp1_entity_get_pad_format(&uds->entity, config, fmt->pad);
211 *format = fmt->format;
213 if (fmt->pad == UDS_PAD_SINK) {
214 /* Propagate the format to the source pad. */
215 format = vsp1_entity_get_pad_format(&uds->entity, config,
217 *format = fmt->format;
219 uds_try_format(uds, config, UDS_PAD_SOURCE, format);
225 /* -----------------------------------------------------------------------------
226 * V4L2 Subdevice Operations
229 static struct v4l2_subdev_pad_ops uds_pad_ops = {
230 .init_cfg = vsp1_entity_init_cfg,
231 .enum_mbus_code = uds_enum_mbus_code,
232 .enum_frame_size = uds_enum_frame_size,
233 .get_fmt = vsp1_subdev_get_pad_format,
234 .set_fmt = uds_set_format,
237 static struct v4l2_subdev_ops uds_ops = {
241 /* -----------------------------------------------------------------------------
242 * VSP1 Entity Operations
245 static void uds_configure(struct vsp1_entity *entity,
246 struct vsp1_pipeline *pipe,
247 struct vsp1_dl_list *dl)
249 struct vsp1_uds *uds = to_uds(&entity->subdev);
250 const struct v4l2_mbus_framefmt *output;
251 const struct v4l2_mbus_framefmt *input;
256 input = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
258 output = vsp1_entity_get_pad_format(&uds->entity, uds->entity.config,
261 hscale = uds_compute_ratio(input->width, output->width);
262 vscale = uds_compute_ratio(input->height, output->height);
264 dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);
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
270 if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))
275 vsp1_uds_write(uds, dl, VI6_UDS_CTRL,
276 (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
277 (multitap ? VI6_UDS_CTRL_BC : 0));
279 vsp1_uds_write(uds, dl, VI6_UDS_PASS_BWIDTH,
280 (uds_passband_width(hscale)
281 << VI6_UDS_PASS_BWIDTH_H_SHIFT) |
282 (uds_passband_width(vscale)
283 << VI6_UDS_PASS_BWIDTH_V_SHIFT));
285 /* Set the scaling ratios and the output size. */
286 vsp1_uds_write(uds, dl, VI6_UDS_SCALE,
287 (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
288 (vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
289 vsp1_uds_write(uds, dl, VI6_UDS_CLIP_SIZE,
290 (output->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
291 (output->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
294 static const struct vsp1_entity_operations uds_entity_ops = {
295 .configure = uds_configure,
298 /* -----------------------------------------------------------------------------
299 * Initialization and Cleanup
302 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
304 struct vsp1_uds *uds;
308 uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
310 return ERR_PTR(-ENOMEM);
312 uds->entity.ops = &uds_entity_ops;
313 uds->entity.type = VSP1_ENTITY_UDS;
314 uds->entity.index = index;
316 sprintf(name, "uds.%u", index);
317 ret = vsp1_entity_init(vsp1, &uds->entity, name, 2, &uds_ops);