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
,
122 struct vsp1_uds
*uds
= to_uds(subdev
);
124 if (code
->pad
== UDS_PAD_SINK
) {
125 if (code
->index
>= ARRAY_SIZE(codes
))
128 code
->code
= codes
[code
->index
];
130 struct v4l2_subdev_pad_config
*config
;
131 struct v4l2_mbus_framefmt
*format
;
133 config
= vsp1_entity_get_pad_config(&uds
->entity
, cfg
,
138 /* The UDS can't perform format conversion, the sink format is
139 * always identical to the source format.
144 format
= vsp1_entity_get_pad_format(&uds
->entity
, config
,
146 code
->code
= format
->code
;
152 static int uds_enum_frame_size(struct v4l2_subdev
*subdev
,
153 struct v4l2_subdev_pad_config
*cfg
,
154 struct v4l2_subdev_frame_size_enum
*fse
)
156 struct vsp1_uds
*uds
= to_uds(subdev
);
157 struct v4l2_subdev_pad_config
*config
;
158 struct v4l2_mbus_framefmt
*format
;
160 config
= vsp1_entity_get_pad_config(&uds
->entity
, cfg
, fse
->which
);
164 format
= vsp1_entity_get_pad_format(&uds
->entity
, config
,
167 if (fse
->index
|| fse
->code
!= format
->code
)
170 if (fse
->pad
== UDS_PAD_SINK
) {
171 fse
->min_width
= UDS_MIN_SIZE
;
172 fse
->max_width
= UDS_MAX_SIZE
;
173 fse
->min_height
= UDS_MIN_SIZE
;
174 fse
->max_height
= UDS_MAX_SIZE
;
176 uds_output_limits(format
->width
, &fse
->min_width
,
178 uds_output_limits(format
->height
, &fse
->min_height
,
185 static int uds_get_format(struct v4l2_subdev
*subdev
,
186 struct v4l2_subdev_pad_config
*cfg
,
187 struct v4l2_subdev_format
*fmt
)
189 struct vsp1_uds
*uds
= to_uds(subdev
);
190 struct v4l2_subdev_pad_config
*config
;
192 config
= vsp1_entity_get_pad_config(&uds
->entity
, cfg
, fmt
->which
);
196 fmt
->format
= *vsp1_entity_get_pad_format(&uds
->entity
, config
,
202 static void uds_try_format(struct vsp1_uds
*uds
,
203 struct v4l2_subdev_pad_config
*config
,
204 unsigned int pad
, struct v4l2_mbus_framefmt
*fmt
)
206 struct v4l2_mbus_framefmt
*format
;
207 unsigned int minimum
;
208 unsigned int maximum
;
212 /* Default to YUV if the requested format is not supported. */
213 if (fmt
->code
!= MEDIA_BUS_FMT_ARGB8888_1X32
&&
214 fmt
->code
!= MEDIA_BUS_FMT_AYUV8_1X32
)
215 fmt
->code
= MEDIA_BUS_FMT_AYUV8_1X32
;
217 fmt
->width
= clamp(fmt
->width
, UDS_MIN_SIZE
, UDS_MAX_SIZE
);
218 fmt
->height
= clamp(fmt
->height
, UDS_MIN_SIZE
, UDS_MAX_SIZE
);
222 /* The UDS scales but can't perform format conversion. */
223 format
= vsp1_entity_get_pad_format(&uds
->entity
, config
,
225 fmt
->code
= format
->code
;
227 uds_output_limits(format
->width
, &minimum
, &maximum
);
228 fmt
->width
= clamp(fmt
->width
, minimum
, maximum
);
229 uds_output_limits(format
->height
, &minimum
, &maximum
);
230 fmt
->height
= clamp(fmt
->height
, minimum
, maximum
);
234 fmt
->field
= V4L2_FIELD_NONE
;
235 fmt
->colorspace
= V4L2_COLORSPACE_SRGB
;
238 static int uds_set_format(struct v4l2_subdev
*subdev
,
239 struct v4l2_subdev_pad_config
*cfg
,
240 struct v4l2_subdev_format
*fmt
)
242 struct vsp1_uds
*uds
= to_uds(subdev
);
243 struct v4l2_subdev_pad_config
*config
;
244 struct v4l2_mbus_framefmt
*format
;
246 config
= vsp1_entity_get_pad_config(&uds
->entity
, cfg
, fmt
->which
);
250 uds_try_format(uds
, config
, fmt
->pad
, &fmt
->format
);
252 format
= vsp1_entity_get_pad_format(&uds
->entity
, config
, fmt
->pad
);
253 *format
= fmt
->format
;
255 if (fmt
->pad
== UDS_PAD_SINK
) {
256 /* Propagate the format to the source pad. */
257 format
= vsp1_entity_get_pad_format(&uds
->entity
, config
,
259 *format
= fmt
->format
;
261 uds_try_format(uds
, config
, UDS_PAD_SOURCE
, format
);
267 /* -----------------------------------------------------------------------------
268 * V4L2 Subdevice Operations
271 static struct v4l2_subdev_pad_ops uds_pad_ops
= {
272 .init_cfg
= vsp1_entity_init_cfg
,
273 .enum_mbus_code
= uds_enum_mbus_code
,
274 .enum_frame_size
= uds_enum_frame_size
,
275 .get_fmt
= uds_get_format
,
276 .set_fmt
= uds_set_format
,
279 static struct v4l2_subdev_ops uds_ops
= {
283 /* -----------------------------------------------------------------------------
284 * VSP1 Entity Operations
287 static void uds_configure(struct vsp1_entity
*entity
, struct vsp1_dl_list
*dl
)
289 struct vsp1_uds
*uds
= to_uds(&entity
->subdev
);
290 const struct v4l2_mbus_framefmt
*output
;
291 const struct v4l2_mbus_framefmt
*input
;
296 input
= vsp1_entity_get_pad_format(&uds
->entity
, uds
->entity
.config
,
298 output
= vsp1_entity_get_pad_format(&uds
->entity
, uds
->entity
.config
,
301 hscale
= uds_compute_ratio(input
->width
, output
->width
);
302 vscale
= uds_compute_ratio(input
->height
, output
->height
);
304 dev_dbg(uds
->entity
.vsp1
->dev
, "hscale %u vscale %u\n", hscale
, vscale
);
306 /* Multi-tap scaling can't be enabled along with alpha scaling when
307 * scaling down with a factor lower than or equal to 1/2 in either
310 if (uds
->scale_alpha
&& (hscale
>= 8192 || vscale
>= 8192))
315 vsp1_uds_write(uds
, dl
, VI6_UDS_CTRL
,
316 (uds
->scale_alpha
? VI6_UDS_CTRL_AON
: 0) |
317 (multitap
? VI6_UDS_CTRL_BC
: 0));
319 vsp1_uds_write(uds
, dl
, VI6_UDS_PASS_BWIDTH
,
320 (uds_passband_width(hscale
)
321 << VI6_UDS_PASS_BWIDTH_H_SHIFT
) |
322 (uds_passband_width(vscale
)
323 << VI6_UDS_PASS_BWIDTH_V_SHIFT
));
325 /* Set the scaling ratios and the output size. */
326 vsp1_uds_write(uds
, dl
, VI6_UDS_SCALE
,
327 (hscale
<< VI6_UDS_SCALE_HFRAC_SHIFT
) |
328 (vscale
<< VI6_UDS_SCALE_VFRAC_SHIFT
));
329 vsp1_uds_write(uds
, dl
, VI6_UDS_CLIP_SIZE
,
330 (output
->width
<< VI6_UDS_CLIP_SIZE_HSIZE_SHIFT
) |
331 (output
->height
<< VI6_UDS_CLIP_SIZE_VSIZE_SHIFT
));
334 static const struct vsp1_entity_operations uds_entity_ops
= {
335 .configure
= uds_configure
,
338 /* -----------------------------------------------------------------------------
339 * Initialization and Cleanup
342 struct vsp1_uds
*vsp1_uds_create(struct vsp1_device
*vsp1
, unsigned int index
)
344 struct vsp1_uds
*uds
;
348 uds
= devm_kzalloc(vsp1
->dev
, sizeof(*uds
), GFP_KERNEL
);
350 return ERR_PTR(-ENOMEM
);
352 uds
->entity
.ops
= &uds_entity_ops
;
353 uds
->entity
.type
= VSP1_ENTITY_UDS
;
354 uds
->entity
.index
= index
;
356 sprintf(name
, "uds.%u", index
);
357 ret
= vsp1_entity_init(vsp1
, &uds
->entity
, name
, 2, &uds_ops
);