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>
22 #define UDS_MIN_SIZE 4U
23 #define UDS_MAX_SIZE 8190U
25 #define UDS_MIN_FACTOR 0x0100
26 #define UDS_MAX_FACTOR 0xffff
28 /* -----------------------------------------------------------------------------
32 static inline u32 vsp1_uds_read(struct vsp1_uds *uds, u32 reg)
34 return vsp1_read(uds->entity.vsp1,
35 reg + uds->entity.index * VI6_UDS_OFFSET);
38 static inline void vsp1_uds_write(struct vsp1_uds *uds, u32 reg, u32 data)
40 vsp1_write(uds->entity.vsp1,
41 reg + uds->entity.index * VI6_UDS_OFFSET, data);
44 /* -----------------------------------------------------------------------------
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
53 static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
60 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
62 return (input - 1) / mp * mp * 4096 / ratio + 1;
65 return (input - 1) * 4096 / ratio + 1;
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)
75 static void uds_output_limits(unsigned int input,
76 unsigned int *minimum, unsigned int *maximum)
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);
83 * uds_passband_width - Return the passband filter width for a scaling ratio
84 * @ratio: scaling ratio in U4.12 fixed-point format
86 static unsigned int uds_passband_width(unsigned int ratio)
93 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
95 return 64 * 4096 * mp / ratio;
102 static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
104 /* TODO: This is an approximation that will need to be refined. */
105 return (input - 1) * 4096 / (output - 1);
108 static void uds_compute_ratios(struct vsp1_uds *uds)
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];
114 uds->hscale = uds_compute_ratio(input->width, output->width);
115 uds->vscale = uds_compute_ratio(input->height, output->height);
117 dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n",
118 uds->hscale, uds->vscale);
121 /* -----------------------------------------------------------------------------
122 * V4L2 Subdevice Core Operations
125 static int uds_s_stream(struct v4l2_subdev *subdev, int enable)
127 const struct v4l2_mbus_framefmt *format;
128 struct vsp1_uds *uds = to_uds(subdev);
133 /* Enable multi-tap scaling. */
134 vsp1_uds_write(uds, VI6_UDS_CTRL, VI6_UDS_CTRL_BC);
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));
143 /* Set the scaling ratios and the output size. */
144 format = &uds->entity.formats[UDS_PAD_SOURCE];
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));
156 /* -----------------------------------------------------------------------------
157 * V4L2 Subdevice Pad Operations
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)
164 static const unsigned int codes[] = {
165 V4L2_MBUS_FMT_ARGB8888_1X32,
166 V4L2_MBUS_FMT_AYUV8_1X32,
169 if (code->pad == UDS_PAD_SINK) {
170 if (code->index >= ARRAY_SIZE(codes))
173 code->code = codes[code->index];
175 struct v4l2_mbus_framefmt *format;
177 /* The UDS can't perform format conversion, the sink format is
178 * always identical to the source format.
183 format = v4l2_subdev_get_try_format(fh, UDS_PAD_SINK);
184 code->code = format->code;
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)
194 struct v4l2_mbus_framefmt *format;
196 format = v4l2_subdev_get_try_format(fh, UDS_PAD_SINK);
198 if (fse->index || fse->code != format->code)
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;
207 uds_output_limits(format->width, &fse->min_width,
209 uds_output_limits(format->height, &fse->min_height,
216 static int uds_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
217 struct v4l2_subdev_format *fmt)
219 struct vsp1_uds *uds = to_uds(subdev);
221 fmt->format = *vsp1_entity_get_pad_format(&uds->entity, fh, fmt->pad,
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)
231 struct v4l2_mbus_framefmt *format;
232 unsigned int minimum;
233 unsigned int maximum;
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;
242 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
243 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
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;
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);
259 fmt->field = V4L2_FIELD_NONE;
260 fmt->colorspace = V4L2_COLORSPACE_SRGB;
263 static int uds_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
264 struct v4l2_subdev_format *fmt)
266 struct vsp1_uds *uds = to_uds(subdev);
267 struct v4l2_mbus_framefmt *format;
269 uds_try_format(uds, fh, fmt->pad, &fmt->format, fmt->which);
271 format = vsp1_entity_get_pad_format(&uds->entity, fh, fmt->pad,
273 *format = fmt->format;
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;
281 uds_try_format(uds, fh, UDS_PAD_SOURCE, format, fmt->which);
284 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
285 uds_compute_ratios(uds);
290 /* -----------------------------------------------------------------------------
291 * V4L2 Subdevice Operations
294 static struct v4l2_subdev_video_ops uds_video_ops = {
295 .s_stream = uds_s_stream,
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,
305 static struct v4l2_subdev_ops uds_ops = {
306 .video = &uds_video_ops,
310 /* -----------------------------------------------------------------------------
311 * Initialization and Cleanup
314 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
316 struct v4l2_subdev *subdev;
317 struct vsp1_uds *uds;
320 uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
322 return ERR_PTR(-ENOMEM);
324 uds->entity.type = VSP1_ENTITY_UDS;
325 uds->entity.index = index;
326 uds->entity.id = VI6_DPR_NODE_UDS(index);
328 ret = vsp1_entity_init(vsp1, &uds->entity, 2);
332 /* Initialize the V4L2 subdev. */
333 subdev = &uds->entity.subdev;
334 v4l2_subdev_init(subdev, &uds_ops);
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;
343 vsp1_entity_init_formats(subdev, NULL);