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 /* -----------------------------------------------------------------------------
48 void vsp1_uds_set_alpha(struct vsp1_uds *uds, unsigned int alpha)
50 vsp1_uds_write(uds, VI6_UDS_ALPVAL, alpha << VI6_UDS_ALPVAL_VAL0_SHIFT);
54 * uds_output_size - Return the output size for an input size and scaling ratio
55 * @input: input size in pixels
56 * @ratio: scaling ratio in U4.12 fixed-point format
58 static unsigned int uds_output_size(unsigned int input, unsigned int ratio)
65 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
67 return (input - 1) / mp * mp * 4096 / ratio + 1;
70 return (input - 1) * 4096 / ratio + 1;
75 * uds_output_limits - Return the min and max output sizes for an input size
76 * @input: input size in pixels
77 * @minimum: minimum output size (returned)
78 * @maximum: maximum output size (returned)
80 static void uds_output_limits(unsigned int input,
81 unsigned int *minimum, unsigned int *maximum)
83 *minimum = max(uds_output_size(input, UDS_MAX_FACTOR), UDS_MIN_SIZE);
84 *maximum = min(uds_output_size(input, UDS_MIN_FACTOR), UDS_MAX_SIZE);
88 * uds_passband_width - Return the passband filter width for a scaling ratio
89 * @ratio: scaling ratio in U4.12 fixed-point format
91 static unsigned int uds_passband_width(unsigned int ratio)
98 mp = mp < 4 ? 1 : (mp < 8 ? 2 : 4);
100 return 64 * 4096 * mp / ratio;
107 static unsigned int uds_compute_ratio(unsigned int input, unsigned int output)
109 /* TODO: This is an approximation that will need to be refined. */
110 return (input - 1) * 4096 / (output - 1);
113 /* -----------------------------------------------------------------------------
114 * V4L2 Subdevice Core Operations
117 static int uds_s_stream(struct v4l2_subdev *subdev, int enable)
119 struct vsp1_uds *uds = to_uds(subdev);
120 const struct v4l2_mbus_framefmt *output;
121 const struct v4l2_mbus_framefmt *input;
129 input = &uds->entity.formats[UDS_PAD_SINK];
130 output = &uds->entity.formats[UDS_PAD_SOURCE];
132 hscale = uds_compute_ratio(input->width, output->width);
133 vscale = uds_compute_ratio(input->height, output->height);
135 dev_dbg(uds->entity.vsp1->dev, "hscale %u vscale %u\n", hscale, vscale);
137 /* Multi-tap scaling can't be enabled along with alpha scaling when
138 * scaling down with a factor lower than or equal to 1/2 in either
141 if (uds->scale_alpha && (hscale >= 8192 || vscale >= 8192))
146 vsp1_uds_write(uds, VI6_UDS_CTRL,
147 (uds->scale_alpha ? VI6_UDS_CTRL_AON : 0) |
148 (multitap ? VI6_UDS_CTRL_BC : 0));
150 vsp1_uds_write(uds, VI6_UDS_PASS_BWIDTH,
151 (uds_passband_width(hscale)
152 << VI6_UDS_PASS_BWIDTH_H_SHIFT) |
153 (uds_passband_width(vscale)
154 << VI6_UDS_PASS_BWIDTH_V_SHIFT));
156 /* Set the scaling ratios and the output size. */
157 vsp1_uds_write(uds, VI6_UDS_SCALE,
158 (hscale << VI6_UDS_SCALE_HFRAC_SHIFT) |
159 (vscale << VI6_UDS_SCALE_VFRAC_SHIFT));
160 vsp1_uds_write(uds, VI6_UDS_CLIP_SIZE,
161 (output->width << VI6_UDS_CLIP_SIZE_HSIZE_SHIFT) |
162 (output->height << VI6_UDS_CLIP_SIZE_VSIZE_SHIFT));
167 /* -----------------------------------------------------------------------------
168 * V4L2 Subdevice Pad Operations
171 static int uds_enum_mbus_code(struct v4l2_subdev *subdev,
172 struct v4l2_subdev_pad_config *cfg,
173 struct v4l2_subdev_mbus_code_enum *code)
175 static const unsigned int codes[] = {
176 MEDIA_BUS_FMT_ARGB8888_1X32,
177 MEDIA_BUS_FMT_AYUV8_1X32,
179 struct vsp1_uds *uds = to_uds(subdev);
181 if (code->pad == UDS_PAD_SINK) {
182 if (code->index >= ARRAY_SIZE(codes))
185 code->code = codes[code->index];
187 struct v4l2_mbus_framefmt *format;
189 /* The UDS can't perform format conversion, the sink format is
190 * always identical to the source format.
195 format = vsp1_entity_get_pad_format(&uds->entity, cfg,
196 UDS_PAD_SINK, code->which);
197 code->code = format->code;
203 static int uds_enum_frame_size(struct v4l2_subdev *subdev,
204 struct v4l2_subdev_pad_config *cfg,
205 struct v4l2_subdev_frame_size_enum *fse)
207 struct vsp1_uds *uds = to_uds(subdev);
208 struct v4l2_mbus_framefmt *format;
210 format = vsp1_entity_get_pad_format(&uds->entity, cfg,
211 UDS_PAD_SINK, fse->which);
213 if (fse->index || fse->code != format->code)
216 if (fse->pad == UDS_PAD_SINK) {
217 fse->min_width = UDS_MIN_SIZE;
218 fse->max_width = UDS_MAX_SIZE;
219 fse->min_height = UDS_MIN_SIZE;
220 fse->max_height = UDS_MAX_SIZE;
222 uds_output_limits(format->width, &fse->min_width,
224 uds_output_limits(format->height, &fse->min_height,
231 static int uds_get_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
232 struct v4l2_subdev_format *fmt)
234 struct vsp1_uds *uds = to_uds(subdev);
236 fmt->format = *vsp1_entity_get_pad_format(&uds->entity, cfg, fmt->pad,
242 static void uds_try_format(struct vsp1_uds *uds, struct v4l2_subdev_pad_config *cfg,
243 unsigned int pad, struct v4l2_mbus_framefmt *fmt,
244 enum v4l2_subdev_format_whence which)
246 struct v4l2_mbus_framefmt *format;
247 unsigned int minimum;
248 unsigned int maximum;
252 /* Default to YUV if the requested format is not supported. */
253 if (fmt->code != MEDIA_BUS_FMT_ARGB8888_1X32 &&
254 fmt->code != MEDIA_BUS_FMT_AYUV8_1X32)
255 fmt->code = MEDIA_BUS_FMT_AYUV8_1X32;
257 fmt->width = clamp(fmt->width, UDS_MIN_SIZE, UDS_MAX_SIZE);
258 fmt->height = clamp(fmt->height, UDS_MIN_SIZE, UDS_MAX_SIZE);
262 /* The UDS scales but can't perform format conversion. */
263 format = vsp1_entity_get_pad_format(&uds->entity, cfg,
264 UDS_PAD_SINK, which);
265 fmt->code = format->code;
267 uds_output_limits(format->width, &minimum, &maximum);
268 fmt->width = clamp(fmt->width, minimum, maximum);
269 uds_output_limits(format->height, &minimum, &maximum);
270 fmt->height = clamp(fmt->height, minimum, maximum);
274 fmt->field = V4L2_FIELD_NONE;
275 fmt->colorspace = V4L2_COLORSPACE_SRGB;
278 static int uds_set_format(struct v4l2_subdev *subdev, struct v4l2_subdev_pad_config *cfg,
279 struct v4l2_subdev_format *fmt)
281 struct vsp1_uds *uds = to_uds(subdev);
282 struct v4l2_mbus_framefmt *format;
284 uds_try_format(uds, cfg, fmt->pad, &fmt->format, fmt->which);
286 format = vsp1_entity_get_pad_format(&uds->entity, cfg, fmt->pad,
288 *format = fmt->format;
290 if (fmt->pad == UDS_PAD_SINK) {
291 /* Propagate the format to the source pad. */
292 format = vsp1_entity_get_pad_format(&uds->entity, cfg,
293 UDS_PAD_SOURCE, fmt->which);
294 *format = fmt->format;
296 uds_try_format(uds, cfg, UDS_PAD_SOURCE, format, fmt->which);
302 /* -----------------------------------------------------------------------------
303 * V4L2 Subdevice Operations
306 static struct v4l2_subdev_video_ops uds_video_ops = {
307 .s_stream = uds_s_stream,
310 static struct v4l2_subdev_pad_ops uds_pad_ops = {
311 .enum_mbus_code = uds_enum_mbus_code,
312 .enum_frame_size = uds_enum_frame_size,
313 .get_fmt = uds_get_format,
314 .set_fmt = uds_set_format,
317 static struct v4l2_subdev_ops uds_ops = {
318 .video = &uds_video_ops,
322 /* -----------------------------------------------------------------------------
323 * Initialization and Cleanup
326 struct vsp1_uds *vsp1_uds_create(struct vsp1_device *vsp1, unsigned int index)
328 struct v4l2_subdev *subdev;
329 struct vsp1_uds *uds;
332 uds = devm_kzalloc(vsp1->dev, sizeof(*uds), GFP_KERNEL);
334 return ERR_PTR(-ENOMEM);
336 uds->entity.type = VSP1_ENTITY_UDS;
337 uds->entity.index = index;
339 ret = vsp1_entity_init(vsp1, &uds->entity, 2);
343 /* Initialize the V4L2 subdev. */
344 subdev = &uds->entity.subdev;
345 v4l2_subdev_init(subdev, &uds_ops);
347 subdev->entity.ops = &vsp1_media_ops;
348 subdev->internal_ops = &vsp1_subdev_internal_ops;
349 snprintf(subdev->name, sizeof(subdev->name), "%s uds.%u",
350 dev_name(vsp1->dev), index);
351 v4l2_set_subdevdata(subdev, uds);
352 subdev->flags |= V4L2_SUBDEV_FL_HAS_DEVNODE;
354 vsp1_entity_init_formats(subdev, NULL);