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_AON | 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));
142 /* Set the scaling ratios and the output size. */
143 format = &uds->entity.formats[UDS_PAD_SOURCE];
145 vsp1_uds_write(uds, VI6_UDS_SCALE,
146 (uds->hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
147 (uds->vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
148 vsp1_uds_write(uds, VI6_UDS_CLIP_SIZE,
149 (format->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
150 (format->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
155 /* -----------------------------------------------------------------------------
156 * V4L2 Subdevice Pad Operations
159 static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
160 struct v4l2_subdev_fh *fh,
161 struct v4l2_subdev_mbus_code_enum *code)
163 static const unsigned int codes[] = {
164 V4L2_MBUS_FMT_ARGB8888_1X32,
165 V4L2_MBUS_FMT_AYUV8_1X32,
168 if (code->pad == UDS_PAD_SINK) {
169 if (code->index >= ARRAY_SIZE(codes))
172 code->code = codes[code->index];
174 struct v4l2_mbus_framefmt *format;
176 /* The UDS can't perform format conversion, the sink format is
177 * always identical to the source format.
182 format = v4l2_subdev_get_try_format(fh, UDS_PAD_SINK);
183 code->code = format->code;
189 static int uds_enum_frame_size(struct v4l2_subdev *subdev,
190 struct v4l2_subdev_fh *fh,
191 struct v4l2_subdev_frame_size_enum *fse)
193 struct v4l2_mbus_framefmt *format;
195 format = v4l2_subdev_get_try_format(fh, UDS_PAD_SINK);
197 if (fse->index || fse->code != format->code)
200 if (fse->pad == UDS_PAD_SINK) {
201 fse->min_width = UDS_MIN_SIZE;
202 fse->max_width = UDS_MAX_SIZE;
203 fse->min_height = UDS_MIN_SIZE;
204 fse->max_height = UDS_MAX_SIZE;
206 uds_output_limits(format->width, &fse->min_width,
208 uds_output_limits(format->height, &fse->min_height,
215 static int uds_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
216 struct v4l2_subdev_format *fmt)
218 struct vsp1_uds *uds = to_uds(subdev);
220 fmt->format = *vsp1_entity_get_pad_format(&uds->entity, fh, fmt->pad,
226 static void uds_try_format(struct vsp1_uds *uds, struct v4l2_subdev_fh *fh,
227 unsigned int pad, struct v4l2_mbus_framefmt *fmt,
228 enum v4l2_subdev_format_whence which)
230 struct v4l2_mbus_framefmt *format;
231 unsigned int minimum;
232 unsigned int maximum;
236 /* Default to YUV if the requested format is not supported. */
237 if (fmt->code != V4L2_MBUS_FMT_ARGB8888_1X32 &&
238 fmt->code != V4L2_MBUS_FMT_AYUV8_1X32)
239 fmt->code = V4L2_MBUS_FMT_AYUV8_1X32;
241 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
242 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
246 /* The UDS scales but can't perform format conversion. */
247 format = vsp1_entity_get_pad_format(&uds->entity, fh,
248 UDS_PAD_SINK, which);
249 fmt->code = format->code;
251 uds_output_limits(format->width, &minimum, &maximum);
252 fmt->width = clamp(fmt->width, minimum, maximum);
253 uds_output_limits(format->height, &minimum, &maximum);
254 fmt->height = clamp(fmt->height, minimum, maximum);
258 fmt->field = V4L2_FIELD_NONE;
259 fmt->colorspace = V4L2_COLORSPACE_SRGB;
262 static int uds_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_fh *fh,
263 struct v4l2_subdev_format *fmt)
265 struct vsp1_uds *uds = to_uds(subdev);
266 struct v4l2_mbus_framefmt *format;
268 uds_try_format(uds, fh, fmt->pad, &fmt->format, fmt->which);
270 format = vsp1_entity_get_pad_format(&uds->entity, fh, fmt->pad,
272 *format = fmt->format;
274 if (fmt->pad == UDS_PAD_SINK) {
275 /* Propagate the format to the source pad. */
276 format = vsp1_entity_get_pad_format(&uds->entity, fh,
277 UDS_PAD_SOURCE, fmt->which);
278 *format = fmt->format;
280 uds_try_format(uds, fh, UDS_PAD_SOURCE, format, fmt->which);
283 if (fmt->which == V4L2_SUBDEV_FORMAT_ACTIVE)
284 uds_compute_ratios(uds);
289 /* -----------------------------------------------------------------------------
290 * V4L2 Subdevice Operations
293 static struct v4l2_subdev_video_ops uds_video_ops = {
294 .s_stream = uds_s_stream,
297 static struct v4l2_subdev_pad_ops uds_pad_ops = {
298 .enum_mbus_code = uds_enum_mbus_code,
299 .enum_frame_size = uds_enum_frame_size,
300 .get_fmt = uds_get_format,
301 .set_fmt = uds_set_format,
304 static struct v4l2_subdev_ops uds_ops = {
305 .video = &uds_video_ops,
309 /* -----------------------------------------------------------------------------
310 * Initialization and Cleanup
313 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
315 struct v4l2_subdev *subdev;
316 struct vsp1_uds *uds;
319 uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
321 return ERR_PTR(-ENOMEM);
323 uds->entity.type = VSP1_ENTITY_UDS;
324 uds->entity.index = index;
326 ret = vsp1_entity_init(vsp1, &uds->entity, 2);
330 /* Initialize the V4L2 subdev. */
331 subdev = &uds->entity.subdev;
332 v4l2_subdev_init(subdev, &uds_ops);
334 subdev->entity.ops = &vsp1_media_ops;
335 subdev->internal_ops = &vsp1_subdev_internal_ops;
336 snprintf(subdev->name, sizeof(subdev->name), "%s uds.%u",
337 dev_name(vsp1->dev), index);
338 v4l2_set_subdevdata(subdev, uds);
339 subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
341 vsp1_entity_init_formats(subdev, NULL);